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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<div id="projectname">Leptonica <span id="projectnumber">1.68</span></div>
<div id="projectbrief">C Image Processing Library</div>
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<h1>blend.c File Reference</h1> </div>
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<p>Blend (optionally with a mask) and re-coloring images.
<a href="#_details">More...</a></p>
<div class="textblock"><code>#include <stdio.h></code><br/>
<code>#include <stdlib.h></code><br/>
<code>#include "<a class="el" href="allheaders_8h_source.html">allheaders.h</a>"</code><br/>
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Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#ad12eec2ea8dff86628c6d5717214da66">blendComponents</a> (<a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> a, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> b, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#aece01093947264a4b0363e6190875035">blendHardLightComponents</a> (<a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> a, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> b, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#aa54f843a3af2e59878454fe41d41a614">pixBlend</a> (<a class="el" href="struct_pix.html">PIX</a> *pixs1, <a class="el" href="struct_pix.html">PIX</a> *pixs2, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#aa3711c698d4fb80d7129018b5162f9c6">pixBlendMask</a> (<a class="el" href="struct_pix.html">PIX</a> *pixd, <a class="el" href="struct_pix.html">PIX</a> *pixs1, <a class="el" href="struct_pix.html">PIX</a> *pixs2, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> type)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#a4d49fe68f0b6f6c4b487a82a0a78fdd5">pixBlendGray</a> (<a class="el" href="struct_pix.html">PIX</a> *pixd, <a class="el" href="struct_pix.html">PIX</a> *pixs1, <a class="el" href="struct_pix.html">PIX</a> *pixs2, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> type, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> transparent, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> transpix)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#a35ed557a91a1ad527ef4a6c00e91e6a1">pixBlendColor</a> (<a class="el" href="struct_pix.html">PIX</a> *pixd, <a class="el" href="struct_pix.html">PIX</a> *pixs1, <a class="el" href="struct_pix.html">PIX</a> *pixs2, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> transparent, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> transpix)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#a73515ff61cf772d6f6d93579a876b53e">pixBlendColorByChannel</a> (<a class="el" href="struct_pix.html">PIX</a> *pixd, <a class="el" href="struct_pix.html">PIX</a> *pixs1, <a class="el" href="struct_pix.html">PIX</a> *pixs2, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> rfract, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> gfract, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> bfract, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> transparent, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> transpix)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#a288c03f9eb9ff330240ff1555e38b0ea">pixBlendGrayAdapt</a> (<a class="el" href="struct_pix.html">PIX</a> *pixd, <a class="el" href="struct_pix.html">PIX</a> *pixs1, <a class="el" href="struct_pix.html">PIX</a> *pixs2, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> shift)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#a75cf8f041f0819375b30f289fe74249d">pixFadeWithGray</a> (<a class="el" href="struct_pix.html">PIX</a> *pixs, <a class="el" href="struct_pix.html">PIX</a> *pixb, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> factor, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> type)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#adccd01da6572ef3c8b2a4b955ec4c623">pixBlendHardLight</a> (<a class="el" href="struct_pix.html">PIX</a> *pixd, <a class="el" href="struct_pix.html">PIX</a> *pixs1, <a class="el" href="struct_pix.html">PIX</a> *pixs2, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fract)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#ad4e4745c0c48b3ae04b988e21386d2f3">pixBlendCmap</a> (<a class="el" href="struct_pix.html">PIX</a> *pixs, <a class="el" href="struct_pix.html">PIX</a> *pixb, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> sindex)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#a51d08d3ae19c515a5fabf42db1daf85b">pixBlendWithGrayMask</a> (<a class="el" href="struct_pix.html">PIX</a> *pixs1, <a class="el" href="struct_pix.html">PIX</a> *pixs2, <a class="el" href="struct_pix.html">PIX</a> *pixg, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> x, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> y)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#ac5f519c9ae69dfca48ca7c8419c45d0d">pixColorGray</a> (<a class="el" href="struct_pix.html">PIX</a> *pixs, <a class="el" href="struct_box.html">BOX</a> *box, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> type, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> thresh, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> rval, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> gval, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> bval)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#a76725349efc43bd2cb2e0e6ceeeb4752">pixSnapColor</a> (<a class="el" href="struct_pix.html">PIX</a> *pixd, <a class="el" href="struct_pix.html">PIX</a> *pixs, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> srcval, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> dstval, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> diff)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#aba28c871b7e90d3ccada2794fb4d764e">pixSnapColorCmap</a> (<a class="el" href="struct_pix.html">PIX</a> *pixd, <a class="el" href="struct_pix.html">PIX</a> *pixs, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> srcval, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> dstval, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> diff)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="struct_pix.html">PIX</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#a6997981bec4c8aa87a355506068d3a09">pixLinearMapToTargetColor</a> (<a class="el" href="struct_pix.html">PIX</a> *pixd, <a class="el" href="struct_pix.html">PIX</a> *pixs, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> srcval, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> dstval)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#a757fbd3f00aff2464713880c3991bfaf">pixelLinearMapToTargetColor</a> (<a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> scolor, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> srcmap, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> dstmap, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> *pdcolor)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="blend_8c.html#a809afc500fb12c76e303e447affda840">pixelFractionalShift</a> (<a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> rval, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> gval, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> bval, <a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> fraction, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> *ppixel)</td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Blend (optionally with a mask) and re-coloring images. </p>
<div class="fragment"><pre class="fragment"> Blending two images that are not colormapped
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="blend_8c.html#aa54f843a3af2e59878454fe41d41a614">pixBlend</a>()
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="blend_8c.html#aa3711c698d4fb80d7129018b5162f9c6">pixBlendMask</a>()
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="blend_8c.html#a4d49fe68f0b6f6c4b487a82a0a78fdd5">pixBlendGray</a>()
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="blend_8c.html#a35ed557a91a1ad527ef4a6c00e91e6a1">pixBlendColor</a>()
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="blend_8c.html#a73515ff61cf772d6f6d93579a876b53e">pixBlendColorByChannel</a>()
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="blend_8c.html#a288c03f9eb9ff330240ff1555e38b0ea">pixBlendGrayAdapt</a>()
static <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="blend_8c.html#ad12eec2ea8dff86628c6d5717214da66">blendComponents</a>()
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="blend_8c.html#a75cf8f041f0819375b30f289fe74249d">pixFadeWithGray</a>()
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="blend_8c.html#adccd01da6572ef3c8b2a4b955ec4c623">pixBlendHardLight</a>()
static <a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="blend_8c.html#aece01093947264a4b0363e6190875035">blendHardLightComponents</a>()
Blending two colormapped images
<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="blend_8c.html#ad4e4745c0c48b3ae04b988e21386d2f3">pixBlendCmap</a>()
Blending two images using a third (alpha mask)
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="blend_8c.html#a51d08d3ae19c515a5fabf42db1daf85b">pixBlendWithGrayMask</a>()
Coloring "gray" pixels
<a class="code" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> <a class="code" href="blend_8c.html#ac5f519c9ae69dfca48ca7c8419c45d0d">pixColorGray</a>()
Adjusting one or more <a class="code" href="writetext__reg_8c.html#a4ebbf30ad0e54b03f69dd59a5fa97b18">colors</a> to a target color
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="blend_8c.html#a76725349efc43bd2cb2e0e6ceeeb4752">pixSnapColor</a>()
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="blend_8c.html#aba28c871b7e90d3ccada2794fb4d764e">pixSnapColorCmap</a>()
Mapping <a class="code" href="writetext__reg_8c.html#a4ebbf30ad0e54b03f69dd59a5fa97b18">colors</a> based on a source/target pair
<a class="code" href="struct_pix.html">PIX</a> *<a class="code" href="blend_8c.html#a6997981bec4c8aa87a355506068d3a09">pixLinearMapToTargetColor</a>()
<a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> <a class="code" href="blend_8c.html#a757fbd3f00aff2464713880c3991bfaf">pixelLinearMapToTargetColor</a>()
Fractional shift of RGB towards black or white
<a class="code" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> <a class="code" href="blend_8c.html#a809afc500fb12c76e303e447affda840">pixelFractionalShift</a>()
In blending operations a new pix is produced where typically
a subset of pixels in src1 are changed by the set of pixels
in src2, when src2 is located in a given position relative
to src1. This is similar to rasterop, except that the
blending operations we allow are more complex, and typically
result in dest pixels that are a linear combination of two
pixels, such as src1 and its inverse. I find it convenient
to think of src2 as the "blender" (the one that takes the action)
and src1 as the "blendee" (the one that changes).
Blending works best when src1 is 8 or 32 bpp. We also allow
src1 to be colormapped, but the colormap is removed before blending,
so if src1 is colormapped, we can't allow in-place blending.
Because src2 is typically smaller than src1, we can implement by
clipping src2 to src1 and then transforming some of the dest
pixels that are under the support of src2. In practice, we
do the clipping in the inner pixel loop. For grayscale and
color src2, we also allow a simple form of transparency, where
pixels of a particular value in src2 are transparent; for those pixels,
no blending is done.
The blending functions are categorized by the depth of src2,
the blender, and not that of src1, the blendee.
- If src2 is 1 bpp, we can do one of three things:
(1) <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da8fd0f1d495f371c29d8175c6aac407da">L_BLEND_WITH_INVERSE</a>: Blend a given fraction of src1 with its
inverse color for those pixels in src2 that are fg (ON),
and leave the dest pixels unchanged for pixels in src2 that
are bg (OFF).
(2) <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da885c98d30276d11068bd5b613cbb6510">L_BLEND_TO_WHITE</a>: Fade the src1 pixels toward white by a
given fraction for those pixels in src2 that are fg (ON),
and leave the dest pixels unchanged for pixels in src2 that
are bg (OFF).
(3) <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291daa1ef08fc35a77d1716f7c3b7e39acb1c">L_BLEND_TO_BLACK</a>: Fade the src1 pixels toward black by a
given fraction for those pixels in src2 that are fg (ON),
and leave the dest pixels unchanged for pixels in src2 that
are bg (OFF).
The blending function is <a class="code" href="blend_8c.html#aa3711c698d4fb80d7129018b5162f9c6">pixBlendMask</a>().
- If src2 is 8 bpp grayscale, we can do one of two things
(but see <a class="code" href="blend_8c.html#a75cf8f041f0819375b30f289fe74249d">pixFadeWithGray</a>() below):
(1) <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da5f7056c3021d9af1f9cc65d9d1dbf7a2">L_BLEND_GRAY</a>: If src1 is 8 bpp, mix the two values, using
a fraction of src2 and (1 - fraction) of src1.
If src1 is 32 bpp (rgb), mix the fraction of src2 with
each of the color components in src1.
(2) <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291dad8b010b4a7f8372a4b36ef2df3dee05f">L_BLEND_GRAY_WITH_INVERSE</a>: Use the grayscale value in src2
to determine how much of the inverse of a src1 pixel is
to be combined with the pixel value. The input fraction
further acts to scale the change in the src1 pixel.
The blending function is <a class="code" href="blend_8c.html#a4d49fe68f0b6f6c4b487a82a0a78fdd5">pixBlendGray</a>().
- If src2 is color, we blend a given fraction of src2 with
src1. If src1 is 8 bpp, the resulting <a class="code" href="colorquant__reg_8c.html#aabec89bef1d1e1f9faf4e7d2e685c317">image</a> is 32 bpp.
The blending function is <a class="code" href="blend_8c.html#a35ed557a91a1ad527ef4a6c00e91e6a1">pixBlendColor</a>().
- For all three blending functions -- <a class="code" href="blend_8c.html#aa3711c698d4fb80d7129018b5162f9c6">pixBlendMask</a>(), <a class="code" href="blend_8c.html#a4d49fe68f0b6f6c4b487a82a0a78fdd5">pixBlendGray</a>()
and <a class="code" href="blend_8c.html#a35ed557a91a1ad527ef4a6c00e91e6a1">pixBlendColor</a>() -- you can apply the blender to the blendee
either in-place or generating a new pix. For the in-place
operation, this requires that the depth of the resulting pix
must equal that of the input pixs1.
- We remove colormaps from src1 and src2 before blending.
Any quantization would have to be done after blending.
We include another function, <a class="code" href="blend_8c.html#a75cf8f041f0819375b30f289fe74249d">pixFadeWithGray</a>(), that blends
a gray or color src1 with a gray src2. It does one of these things:
(1) <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291da885c98d30276d11068bd5b613cbb6510">L_BLEND_TO_WHITE</a>: Fade the src1 pixels toward white by
a number times the value in src2.
(2) <a class="code" href="pix_8h.html#a0944a4353780132eeab7b06e3e42291daa1ef08fc35a77d1716f7c3b7e39acb1c">L_BLEND_TO_BLACK</a>: Fade the src1 pixels toward black by
a number times the value in src2.
Also included is a generalization of the so-called "hard light"
blending: <a class="code" href="blend_8c.html#adccd01da6572ef3c8b2a4b955ec4c623">pixBlendHardLight</a>(). We generalize by allowing a fraction < 1.0
of the blender to be admixed with the blendee. The standard function
does full mixing.
</pre></div>
<p>Definition in file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
</div><hr/><h2>Function Documentation</h2>
<a class="anchor" id="ad12eec2ea8dff86628c6d5717214da66"></a><!-- doxytag: member="blend.c::blendComponents" ref="ad12eec2ea8dff86628c6d5717214da66" args="(l_int32 a, l_int32 b, l_float32 fract)" -->
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<td class="memname">static <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> blendComponents </td>
<td>(</td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>a</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>b</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td>
<td class="paramname"><em>fract</em> </td>
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<td>)</td>
<td></td><td><code> [static]</code></td>
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<div class="memdoc">
<p>Definition at line <a class="el" href="blend_8c_source.html#l00845">845</a> of file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
<p>Referenced by <a class="el" href="blend_8c_source.html#l00760">pixBlendColorByChannel()</a>.</p>
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<a class="anchor" id="aece01093947264a4b0363e6190875035"></a><!-- doxytag: member="blend.c::blendHardLightComponents" ref="aece01093947264a4b0363e6190875035" args="(l_int32 a, l_int32 b, l_float32 fract)" -->
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<td class="memname">static <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> blendHardLightComponents </td>
<td>(</td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>a</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>b</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td>
<td class="paramname"><em>fract</em> </td>
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<td>)</td>
<td></td><td><code> [static]</code></td>
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<div class="memdoc">
<p>Definition at line <a class="el" href="blend_8c_source.html#l01318">1318</a> of file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
<p>Referenced by <a class="el" href="blend_8c_source.html#l01191">pixBlendHardLight()</a>.</p>
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<a class="anchor" id="aa54f843a3af2e59878454fe41d41a614"></a><!-- doxytag: member="blend.c::pixBlend" ref="aa54f843a3af2e59878454fe41d41a614" args="(PIX *pixs1, PIX *pixs2, l_int32 x, l_int32 y, l_float32 fract)" -->
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<td class="memname"><a class="el" href="struct_pix.html">PIX</a>* pixBlend </td>
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<td class="paramname"><em>pixs1</em>, </td>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixs2</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>x</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>y</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td>
<td class="paramname"><em>fract</em> </td>
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<p><a class="el" href="blend_8c.html#aa54f843a3af2e59878454fe41d41a614">pixBlend()</a></p>
<p>Input: pixs1 (blendee) pixs2 (blender; typ. smaller) x,y (origin (UL corner) of pixs2 relative to the origin of pixs1; can be < 0) fract (blending fraction) Return: pixd (blended image), or null on error</p>
<p>Notes: (1) This is a simple top-level interface. For more flexibility, call directly into <a class="el" href="blend_8c.html#aa3711c698d4fb80d7129018b5162f9c6">pixBlendMask()</a>, etc. </p>
<p>Definition at line <a class="el" href="blend_8c_source.html#l00157">157</a> of file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
<p>References <a class="el" href="boxbasic_8c_source.html#l00133">boxCreate()</a>, <a class="el" href="boxbasic_8c_source.html#l00242">boxDestroy()</a>, <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="pix_8h_source.html#l00633">L_BLEND_GRAY</a>, <a class="el" href="pix_8h_source.html#l00630">L_BLEND_WITH_INVERSE</a>, <a class="el" href="environ_8h_source.html#l00155">L_MAX</a>, <a class="el" href="environ_8h_source.html#l00257">L_WARNING</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="blend_8c_source.html#l00652">pixBlendColor()</a>, <a class="el" href="blend_8c_source.html#l00456">pixBlendGray()</a>, <a class="el" href="blend_8c_source.html#l00240">pixBlendMask()</a>, <a class="el" href="pix5_8c_source.html#l00698">pixClipRectangle()</a>, <a class="el" href="pix1_8c_source.html#l00466">pixDestroy()</a>, <a class="el" href="pix1_8c_source.html#l00863">pixGetDepth()</a>, <a class="el" href="pix1_8c_source.html#l00898">pixGetDimensions()</a>, <a class="el" href="pixconv_8c_source.html#l00223">pixRemoveColormap()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, and <a class="el" href="pix_8h_source.html#l00181">REMOVE_CMAP_BASED_ON_SRC</a>.</p>
<p>Referenced by <a class="el" href="blendtest1_8c_source.html#l00030">main()</a>.</p>
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<a class="anchor" id="aa3711c698d4fb80d7129018b5162f9c6"></a><!-- doxytag: member="blend.c::pixBlendMask" ref="aa3711c698d4fb80d7129018b5162f9c6" args="(PIX *pixd, PIX *pixs1, PIX *pixs2, l_int32 x, l_int32 y, l_float32 fract, l_int32 type)" -->
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<td class="paramname"><em>pixd</em>, </td>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixs1</em>, </td>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixs2</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>x</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>y</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td>
<td class="paramname"><em>fract</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>type</em> </td>
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<p><a class="el" href="blend_8c.html#aa3711c698d4fb80d7129018b5162f9c6">pixBlendMask()</a></p>
<p>Input: pixd (<optional>; either NULL or equal to pixs1 for in-place) pixs1 (blendee; depth > 1) pixs2 (blender; typ. smaller in size than pixs1) x,y (origin (UL corner) of pixs2 relative to the origin of pixs1; can be < 0) fract (blending fraction) type (L_BLEND_WITH_INVERSE, L_BLEND_TO_WHITE, L_BLEND_TO_BLACK) Return: pixd if OK; pixs1 on error</p>
<p>Notes: (1) pixs2 must be 1 bpp (2) Clipping of pixs2 to pixs1 is done in the inner pixel loop. (3) If pixs1 has a colormap, it is removed. (4) For inplace operation, call it this way: pixBlendMask(pixs1, pixs1, pixs2, ...) (5) For generating a new pixd: pixd = pixBlendMask(NULL, pixs1, pixs2, ...) (6) Only call in-place if pixs1 does not have a colormap. </p>
<p>Definition at line <a class="el" href="blend_8c_source.html#l00240">240</a> of file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
<p>References <a class="el" href="pix2_8c_source.html#l02076">composeRGBPixel()</a>, <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="pix2_8c_source.html#l02108">extractRGBValues()</a>, <a class="el" href="environ_8h_source.html#l00179">FALSE</a>, <a class="el" href="arrayaccess_8h_source.html#l00060">GET_DATA_BIT</a>, <a class="el" href="pix_8h_source.html#l00632">L_BLEND_TO_BLACK</a>, <a class="el" href="pix_8h_source.html#l00631">L_BLEND_TO_WHITE</a>, <a class="el" href="pix_8h_source.html#l00630">L_BLEND_WITH_INVERSE</a>, <a class="el" href="environ_8h_source.html#l00257">L_WARNING</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="pix1_8c_source.html#l00440">pixClone()</a>, <a class="el" href="pixconv_8c_source.html#l02297">pixConvertTo8()</a>, <a class="el" href="pix1_8c_source.html#l00548">pixCopy()</a>, <a class="el" href="pix1_8c_source.html#l00466">pixDestroy()</a>, <a class="el" href="pix1_8c_source.html#l01288">pixGetColormap()</a>, <a class="el" href="pix1_8c_source.html#l01358">pixGetData()</a>, <a class="el" href="pix1_8c_source.html#l00863">pixGetDepth()</a>, <a class="el" href="pix1_8c_source.html#l00898">pixGetDimensions()</a>, <a class="el" href="pix1_8c_source.html#l00833">pixGetHeight()</a>, <a class="el" href="pix2_8c_source.html#l00148">pixGetPixel()</a>, <a class="el" href="pix1_8c_source.html#l00803">pixGetWidth()</a>, <a class="el" href="pix1_8c_source.html#l00970">pixGetWpl()</a>, <a class="el" href="pixconv_8c_source.html#l00223">pixRemoveColormap()</a>, <a class="el" href="pix2_8c_source.html#l00219">pixSetPixel()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, and <a class="el" href="pix_8h_source.html#l00181">REMOVE_CMAP_BASED_ON_SRC</a>.</p>
<p>Referenced by <a class="el" href="blend_8c_source.html#l00157">pixBlend()</a>.</p>
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<a class="anchor" id="a4d49fe68f0b6f6c4b487a82a0a78fdd5"></a><!-- doxytag: member="blend.c::pixBlendGray" ref="a4d49fe68f0b6f6c4b487a82a0a78fdd5" args="(PIX *pixd, PIX *pixs1, PIX *pixs2, l_int32 x, l_int32 y, l_float32 fract, l_int32 type, l_int32 transparent, l_uint32 transpix)" -->
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<td class="paramname"><em>pixd</em>, </td>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixs1</em>, </td>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixs2</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>x</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td>
<td class="paramname"><em>fract</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>type</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>transparent</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> </td>
<td class="paramname"><em>transpix</em> </td>
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<p><a class="el" href="blend_8c.html#a4d49fe68f0b6f6c4b487a82a0a78fdd5">pixBlendGray()</a></p>
<p>Input: pixd (<optional>; either NULL or equal to pixs1 for in-place) pixs1 (blendee; depth > 1) pixs2 (blender, 8 bpp; typ. smaller in size than pixs1) x,y (origin (UL corner) of pixs2 relative to the origin of pixs1; can be < 0) fract (blending fraction) type (L_BLEND_GRAY, L_BLEND_GRAY_WITH_INVERSE) transparent (1 to use transparency; 0 otherwise) transpix (pixel grayval in pixs2 that is to be transparent) Return: pixd if OK; pixs1 on error</p>
<p>Notes: (1) pixs2 must be 8 bpp, and have no colormap. (2) Clipping of pixs2 to pixs1 is done in the inner pixel loop. (3) If pixs1 has a colormap, it is removed. (4) If pixs1 has depth < 8, it is unpacked to generate a 8 bpp pix. (5) For inplace operation, call it this way: pixBlendGray(pixs1, pixs1, pixs2, ...) (6) For generating a new pixd: pixd = pixBlendGray(NULL, pixs1, pixs2, ...) (7) Only call in-place if pixs1 does not have a colormap; otherwise it is an error. (8) If transparent = 0, the blending fraction (fract) is applied equally to all pixels. (9) If transparent = 1, all pixels of value transpix (typically either 0 or 0xff) in pixs2 are transparent in the blend. (10) After processing pixs1, it is either 8 bpp or 32 bpp:</p>
<ul>
<li>if 8 bpp, the fraction of pixs2 is mixed with pixs1.</li>
<li>if 32 bpp, each component of pixs1 is mixed with the same fraction of pixs2. (11) For L_BLEND_GRAY_WITH_INVERSE, the white values of the blendee (cval == 255 in the code below) result in a delta of 0. Thus, these pixels are intrinsically transparent! The "pivot" value of the src, at which no blending occurs, is 128. Compare with the adaptive pivot in <a class="el" href="blend_8c.html#a288c03f9eb9ff330240ff1555e38b0ea">pixBlendGrayAdapt()</a>. </li>
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<p>Definition at line <a class="el" href="blend_8c_source.html#l00456">456</a> of file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
<p>References <a class="el" href="pix2_8c_source.html#l02076">composeRGBPixel()</a>, <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="pix2_8c_source.html#l02108">extractRGBValues()</a>, <a class="el" href="environ_8h_source.html#l00179">FALSE</a>, <a class="el" href="arrayaccess_8h_source.html#l00118">GET_DATA_BYTE</a>, <a class="el" href="pix_8h_source.html#l00633">L_BLEND_GRAY</a>, <a class="el" href="pix_8h_source.html#l00634">L_BLEND_GRAY_WITH_INVERSE</a>, <a class="el" href="environ_8h_source.html#l00257">L_WARNING</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="pix1_8c_source.html#l00440">pixClone()</a>, <a class="el" href="pixconv_8c_source.html#l02297">pixConvertTo8()</a>, <a class="el" href="pix1_8c_source.html#l00548">pixCopy()</a>, <a class="el" href="pix1_8c_source.html#l00466">pixDestroy()</a>, <a class="el" href="pix1_8c_source.html#l01288">pixGetColormap()</a>, <a class="el" href="pix1_8c_source.html#l01358">pixGetData()</a>, <a class="el" href="pix1_8c_source.html#l00863">pixGetDepth()</a>, <a class="el" href="pix1_8c_source.html#l00898">pixGetDimensions()</a>, <a class="el" href="pix1_8c_source.html#l00970">pixGetWpl()</a>, <a class="el" href="pixconv_8c_source.html#l00223">pixRemoveColormap()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, <a class="el" href="pix_8h_source.html#l00181">REMOVE_CMAP_BASED_ON_SRC</a>, and <a class="el" href="arrayaccess_8h_source.html#l00126">SET_DATA_BYTE</a>.</p>
<p>Referenced by <a class="el" href="blend__reg_8c_source.html#l00167">GrayBlend()</a>, <a class="el" href="blendtest1_8c_source.html#l00030">main()</a>, and <a class="el" href="blend_8c_source.html#l00157">pixBlend()</a>.</p>
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<a class="anchor" id="a35ed557a91a1ad527ef4a6c00e91e6a1"></a><!-- doxytag: member="blend.c::pixBlendColor" ref="a35ed557a91a1ad527ef4a6c00e91e6a1" args="(PIX *pixd, PIX *pixs1, PIX *pixs2, l_int32 x, l_int32 y, l_float32 fract, l_int32 transparent, l_uint32 transpix)" -->
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>y</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>transparent</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> </td>
<td class="paramname"><em>transpix</em> </td>
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<p><a class="el" href="blend_8c.html#a35ed557a91a1ad527ef4a6c00e91e6a1">pixBlendColor()</a></p>
<p>Input: pixd (<optional>; either NULL or equal to pixs1 for in-place) pixs1 (blendee; depth > 1) pixs2 (blender, 32 bpp; typ. smaller in size than pixs1) x,y (origin (UL corner) of pixs2 relative to the origin of pixs1) fract (blending fraction) transparent (1 to use transparency; 0 otherwise) transpix (pixel color in pixs2 that is to be transparent) Return: pixd if OK; pixs1 on error</p>
<p>Notes: (1) pixs2 must be 32 bpp, and have no colormap. (2) Clipping of pixs2 to pixs1 is done in the inner pixel loop. (3) If pixs1 has a colormap, it is removed to generate a 32 bpp pix. (4) If pixs1 has depth < 32, it is unpacked to generate a 32 bpp pix. (5) For inplace operation, call it this way: pixBlendColor(pixs1, pixs1, pixs2, ...) (6) For generating a new pixd: pixd = pixBlendColor(NULL, pixs1, pixs2, ...) (7) Only call in-place if pixs1 is 32 bpp; otherwise it is an error. (8) If transparent = 0, the blending fraction (fract) is applied equally to all pixels. (9) If transparent = 1, all pixels of value transpix (typically either 0 or 0xffffff00) in pixs2 are transparent in the blend. </p>
<p>Definition at line <a class="el" href="blend_8c_source.html#l00652">652</a> of file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
<p>References <a class="el" href="pix2_8c_source.html#l02076">composeRGBPixel()</a>, <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="pix2_8c_source.html#l02108">extractRGBValues()</a>, <a class="el" href="environ_8h_source.html#l00257">L_WARNING</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="pix1_8c_source.html#l00440">pixClone()</a>, <a class="el" href="pixconv_8c_source.html#l02453">pixConvertTo32()</a>, <a class="el" href="pix1_8c_source.html#l00548">pixCopy()</a>, <a class="el" href="pix1_8c_source.html#l00466">pixDestroy()</a>, <a class="el" href="pix1_8c_source.html#l01358">pixGetData()</a>, <a class="el" href="pix1_8c_source.html#l00863">pixGetDepth()</a>, <a class="el" href="pix1_8c_source.html#l00898">pixGetDimensions()</a>, <a class="el" href="pix1_8c_source.html#l00970">pixGetWpl()</a>, <a class="el" href="pixconv_8c_source.html#l00223">pixRemoveColormap()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, and <a class="el" href="pix_8h_source.html#l00180">REMOVE_CMAP_TO_FULL_COLOR</a>.</p>
<p>Referenced by <a class="el" href="blend__reg_8c_source.html#l00224">ColorBlend()</a>, <a class="el" href="blendtest1_8c_source.html#l00030">main()</a>, and <a class="el" href="blend_8c_source.html#l00157">pixBlend()</a>.</p>
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<a class="anchor" id="a73515ff61cf772d6f6d93579a876b53e"></a><!-- doxytag: member="blend.c::pixBlendColorByChannel" ref="a73515ff61cf772d6f6d93579a876b53e" args="(PIX *pixd, PIX *pixs1, PIX *pixs2, l_int32 x, l_int32 y, l_float32 rfract, l_float32 gfract, l_float32 bfract, l_int32 transparent, l_uint32 transpix)" -->
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<td class="memname"><a class="el" href="struct_pix.html">PIX</a>* pixBlendColorByChannel </td>
<td>(</td>
<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixd</em>, </td>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixs1</em>, </td>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixs2</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>x</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>y</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td>
<td class="paramname"><em>rfract</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td>
<td class="paramname"><em>gfract</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td>
<td class="paramname"><em>bfract</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>transparent</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> </td>
<td class="paramname"><em>transpix</em> </td>
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<p>Definition at line <a class="el" href="blend_8c_source.html#l00760">760</a> of file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
<p>References <a class="el" href="blend_8c_source.html#l00845">blendComponents()</a>, <a class="el" href="pix2_8c_source.html#l02076">composeRGBPixel()</a>, <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="pix2_8c_source.html#l02108">extractRGBValues()</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="pix1_8c_source.html#l00440">pixClone()</a>, <a class="el" href="pixconv_8c_source.html#l02453">pixConvertTo32()</a>, <a class="el" href="pix1_8c_source.html#l00548">pixCopy()</a>, <a class="el" href="pix1_8c_source.html#l00466">pixDestroy()</a>, <a class="el" href="pix1_8c_source.html#l01358">pixGetData()</a>, <a class="el" href="pix1_8c_source.html#l00863">pixGetDepth()</a>, <a class="el" href="pix1_8c_source.html#l00898">pixGetDimensions()</a>, <a class="el" href="pix1_8c_source.html#l00970">pixGetWpl()</a>, <a class="el" href="pixconv_8c_source.html#l00223">pixRemoveColormap()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, and <a class="el" href="pix_8h_source.html#l00180">REMOVE_CMAP_TO_FULL_COLOR</a>.</p>
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<a class="anchor" id="a288c03f9eb9ff330240ff1555e38b0ea"></a><!-- doxytag: member="blend.c::pixBlendGrayAdapt" ref="a288c03f9eb9ff330240ff1555e38b0ea" args="(PIX *pixd, PIX *pixs1, PIX *pixs2, l_int32 x, l_int32 y, l_float32 fract, l_int32 shift)" -->
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<td class="memname"><a class="el" href="struct_pix.html">PIX</a>* pixBlendGrayAdapt </td>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixd</em>, </td>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixs1</em>, </td>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixs2</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>x</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>y</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td>
<td class="paramname"><em>fract</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>shift</em> </td>
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<p><a class="el" href="blend_8c.html#a288c03f9eb9ff330240ff1555e38b0ea">pixBlendGrayAdapt()</a></p>
<p>Input: pixd (<optional>; either NULL or equal to pixs1 for in-place) pixs1 (blendee; depth > 1) pixs2 (blender, 8 bpp; typ. smaller in size than pixs1) x,y (origin (UL corner) of pixs2 relative to the origin of pixs1; can be < 0) fract (blending fraction) shift (>= 0 but <= 128: shift of zero blend value from median source; use -1 for default value; ) Return: pixd if OK; pixs1 on error</p>
<p>Notes: (1) pixs2 must be 8 bpp, and have no colormap. (2) Clipping of pixs2 to pixs1 is done in the inner pixel loop. (3) If pixs1 has a colormap, it is removed. (4) If pixs1 has depth < 8, it is unpacked to generate a 8 bpp pix. (5) For inplace operation, call it this way: pixBlendGray(pixs1, pixs1, pixs2, ...) For generating a new pixd: pixd = pixBlendGray(NULL, pixs1, pixs2, ...) Only call in-place if pixs1 does not have a colormap; otherwise it is an error. (6) This does a blend with inverse. Whereas in pixGlendGray(), the zero blend point is where the blendee pixel is 128, here the zero blend point is found adaptively, with respect to the median of the blendee region. If the median is < 128, the zero blend point is found from median + shift. Otherwise, if the median >= 128, the zero blend point is median - shift. The purpose of shifting the zero blend point away from the median is to prevent a situation in <a class="el" href="blend_8c.html#a4d49fe68f0b6f6c4b487a82a0a78fdd5">pixBlendGray()</a> where the median is 128 and the blender is not visible. The default value of shift is 64. (7) After processing pixs1, it is either 8 bpp or 32 bpp:</p>
<ul>
<li>if 8 bpp, the fraction of pixs2 is mixed with pixs1.</li>
<li>if 32 bpp, each component of pixs1 is mixed with the same fraction of pixs2. (8) The darker the blender, the more it mixes with the blendee. A blender value of 0 has maximum mixing; a value of 255 has no mixing and hence is transparent. </li>
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<p>Definition at line <a class="el" href="blend_8c_source.html#l00902">902</a> of file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
<p>References <a class="el" href="boxbasic_8c_source.html#l00133">boxCreate()</a>, <a class="el" href="boxbasic_8c_source.html#l00242">boxDestroy()</a>, <a class="el" href="boxfunc1_8c_source.html#l00102">boxIntersects()</a>, <a class="el" href="pix2_8c_source.html#l02076">composeRGBPixel()</a>, <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="pix2_8c_source.html#l02108">extractRGBValues()</a>, <a class="el" href="environ_8h_source.html#l00179">FALSE</a>, <a class="el" href="arrayaccess_8h_source.html#l00118">GET_DATA_BYTE</a>, <a class="el" href="environ_8h_source.html#l00155">L_MAX</a>, <a class="el" href="environ_8h_source.html#l00257">L_WARNING</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="pix5_8c_source.html#l00698">pixClipRectangle()</a>, <a class="el" href="pix1_8c_source.html#l00440">pixClone()</a>, <a class="el" href="pixconv_8c_source.html#l02297">pixConvertTo8()</a>, <a class="el" href="pix1_8c_source.html#l00548">pixCopy()</a>, <a class="el" href="pix1_8c_source.html#l00466">pixDestroy()</a>, <a class="el" href="pix1_8c_source.html#l01288">pixGetColormap()</a>, <a class="el" href="pix1_8c_source.html#l01358">pixGetData()</a>, <a class="el" href="pix1_8c_source.html#l00863">pixGetDepth()</a>, <a class="el" href="pix1_8c_source.html#l00898">pixGetDimensions()</a>, <a class="el" href="pix4_8c_source.html#l00713">pixGetRankValueMasked()</a>, <a class="el" href="pix1_8c_source.html#l00970">pixGetWpl()</a>, <a class="el" href="pixconv_8c_source.html#l00223">pixRemoveColormap()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, <a class="el" href="pix_8h_source.html#l00181">REMOVE_CMAP_BASED_ON_SRC</a>, and <a class="el" href="arrayaccess_8h_source.html#l00126">SET_DATA_BYTE</a>.</p>
<p>Referenced by <a class="el" href="blend__reg_8c_source.html#l00196">AdaptiveGrayBlend()</a>.</p>
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<a class="anchor" id="a75cf8f041f0819375b30f289fe74249d"></a><!-- doxytag: member="blend.c::pixFadeWithGray" ref="a75cf8f041f0819375b30f289fe74249d" args="(PIX *pixs, PIX *pixb, l_float32 factor, l_int32 type)" -->
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
<td class="paramname"><em>pixb</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#af59419416d96ecf5fca70c8d05adb456">l_float32</a> </td>
<td class="paramname"><em>factor</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>type</em> </td>
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<p><a class="el" href="blend_8c.html#a75cf8f041f0819375b30f289fe74249d">pixFadeWithGray()</a></p>
<p>Input: pixs (colormapped or 8 bpp or 32 bpp) pixb (8 bpp blender) factor (multiplicative factor to apply to blender value) type (L_BLEND_TO_WHITE, L_BLEND_TO_BLACK) Return: pixd, or null on error</p>
<p>Notes: (1) This function combines two pix aligned to the UL corner; they need not be the same size. (2) Each pixel in pixb is multiplied by 'factor' divided by 255, and clipped to the range [0 ... 1]. This gives the fade fraction to be appied to pixs. Fade either to white (L_BLEND_TO_WHITE) or to black (L_BLEND_TO_BLACK). </p>
<p>Definition at line <a class="el" href="blend_8c_source.html#l01079">1079</a> of file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
<p>References <a class="el" href="pix2_8c_source.html#l02076">composeRGBPixel()</a>, <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="pix2_8c_source.html#l02108">extractRGBValues()</a>, <a class="el" href="arrayaccess_8h_source.html#l00118">GET_DATA_BYTE</a>, <a class="el" href="pix_8h_source.html#l00632">L_BLEND_TO_BLACK</a>, <a class="el" href="pix_8h_source.html#l00631">L_BLEND_TO_WHITE</a>, <a class="el" href="environ_8h_source.html#l00151">L_MIN</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="pix1_8c_source.html#l00548">pixCopy()</a>, <a class="el" href="pix1_8c_source.html#l01288">pixGetColormap()</a>, <a class="el" href="pix1_8c_source.html#l01358">pixGetData()</a>, <a class="el" href="pix1_8c_source.html#l00863">pixGetDepth()</a>, <a class="el" href="pix1_8c_source.html#l00898">pixGetDimensions()</a>, <a class="el" href="pix1_8c_source.html#l00970">pixGetWpl()</a>, <a class="el" href="pixconv_8c_source.html#l00223">pixRemoveColormap()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, <a class="el" href="pix_8h_source.html#l00181">REMOVE_CMAP_BASED_ON_SRC</a>, and <a class="el" href="arrayaccess_8h_source.html#l00126">SET_DATA_BYTE</a>.</p>
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<a class="anchor" id="adccd01da6572ef3c8b2a4b955ec4c623"></a><!-- doxytag: member="blend.c::pixBlendHardLight" ref="adccd01da6572ef3c8b2a4b955ec4c623" args="(PIX *pixd, PIX *pixs1, PIX *pixs2, l_int32 x, l_int32 y, l_float32 fract)" -->
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<td class="paramname"><em>pixd</em>, </td>
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<td class="paramname"><em>pixs2</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>x</em>, </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
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<p>Definition at line <a class="el" href="blend_8c_source.html#l01191">1191</a> of file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
<p>References <a class="el" href="blend_8c_source.html#l01318">blendHardLightComponents()</a>, <a class="el" href="pix2_8c_source.html#l02076">composeRGBPixel()</a>, <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="pix2_8c_source.html#l02108">extractRGBValues()</a>, <a class="el" href="arrayaccess_8h_source.html#l00118">GET_DATA_BYTE</a>, <a class="el" href="environ_8h_source.html#l00257">L_WARNING</a>, <a class="el" href="pix1_8c_source.html#l00440">pixClone()</a>, <a class="el" href="pixconv_8c_source.html#l02453">pixConvertTo32()</a>, <a class="el" href="pix1_8c_source.html#l00548">pixCopy()</a>, <a class="el" href="pix1_8c_source.html#l00466">pixDestroy()</a>, <a class="el" href="pix1_8c_source.html#l01288">pixGetColormap()</a>, <a class="el" href="pix1_8c_source.html#l01358">pixGetData()</a>, <a class="el" href="pix1_8c_source.html#l00863">pixGetDepth()</a>, <a class="el" href="pix1_8c_source.html#l00898">pixGetDimensions()</a>, <a class="el" href="pix1_8c_source.html#l00970">pixGetWpl()</a>, <a class="el" href="pixconv_8c_source.html#l00223">pixRemoveColormap()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, <a class="el" href="pix_8h_source.html#l00181">REMOVE_CMAP_BASED_ON_SRC</a>, <a class="el" href="pix_8h_source.html#l00180">REMOVE_CMAP_TO_FULL_COLOR</a>, and <a class="el" href="arrayaccess_8h_source.html#l00126">SET_DATA_BYTE</a>.</p>
<p>Referenced by <a class="el" href="hardlight__reg_8c_source.html#l00056">TestHardlight()</a>.</p>
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<a class="anchor" id="ad4e4745c0c48b3ae04b988e21386d2f3"></a><!-- doxytag: member="blend.c::pixBlendCmap" ref="ad4e4745c0c48b3ae04b988e21386d2f3" args="(PIX *pixs, PIX *pixb, l_int32 x, l_int32 y, l_int32 sindex)" -->
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
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<td class="paramname"><em>sindex</em> </td>
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<p><a class="el" href="blend_8c.html#ad4e4745c0c48b3ae04b988e21386d2f3">pixBlendCmap()</a></p>
<p>Input: pixs (2, 4 or 8 bpp, with colormap) pixb (colormapped blender) x, y (UL corner of blender relative to pixs) sindex (colormap index of pixels in pixs to be changed) Return: 0 if OK, 1 on error</p>
<p>Note: (1) This function combines two colormaps, and replaces the pixels in pixs that have a specified color value with those in pixb. (2) sindex must be in the existing colormap; otherwise an error is returned. In use, sindex will typically be the index for white (255, 255, 255). (3) Blender colors that already exist in the colormap are used; others are added. If any blender colors cannot be stored in the colormap, an error is returned. (4) In the implementation, a mapping is generated from each original blender colormap index to the corresponding index in the expanded colormap for pixs. Then for each pixel in pixs with value sindex, and which is covered by a blender pixel, the new index corresponding to the blender pixel is substituted for sindex. </p>
<p>Definition at line <a class="el" href="blend_8c_source.html#l01361">1361</a> of file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
<p>References <a class="el" href="environ_8h_source.html#l00251">ERROR_INT</a>, <a class="el" href="arrayaccess_8h_source.html#l00118">GET_DATA_BYTE</a>, <a class="el" href="arrayaccess_8h_source.html#l00080">GET_DATA_DIBIT</a>, <a class="el" href="arrayaccess_8h_source.html#l00097">GET_DATA_QBIT</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="colormap_8c_source.html#l00271">pixcmapAddColor()</a>, <a class="el" href="colormap_8c_source.html#l00207">pixcmapCopy()</a>, <a class="el" href="colormap_8c_source.html#l00238">pixcmapDestroy()</a>, <a class="el" href="colormap_8c_source.html#l00632">pixcmapGetColor()</a>, <a class="el" href="colormap_8c_source.html#l00517">pixcmapGetCount()</a>, <a class="el" href="colormap_8c_source.html#l00739">pixcmapGetIndex()</a>, <a class="el" href="pix1_8c_source.html#l01288">pixGetColormap()</a>, <a class="el" href="pix1_8c_source.html#l01358">pixGetData()</a>, <a class="el" href="pix1_8c_source.html#l00898">pixGetDimensions()</a>, <a class="el" href="pix2_8c_source.html#l00148">pixGetPixel()</a>, <a class="el" href="pix1_8c_source.html#l00970">pixGetWpl()</a>, <a class="el" href="pix1_8c_source.html#l01312">pixSetColormap()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, <a class="el" href="arrayaccess_8h_source.html#l00126">SET_DATA_BYTE</a>, <a class="el" href="arrayaccess_8h_source.html#l00083">SET_DATA_DIBIT</a>, and <a class="el" href="arrayaccess_8h_source.html#l00100">SET_DATA_QBIT</a>.</p>
<p>Referenced by <a class="el" href="blendcmaptest_8c_source.html#l00030">main()</a>.</p>
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<td class="memname"><a class="el" href="struct_pix.html">PIX</a>* pixBlendWithGrayMask </td>
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<p><a class="el" href="blend_8c.html#a51d08d3ae19c515a5fabf42db1daf85b">pixBlendWithGrayMask()</a></p>
<p>Input: pixs1 (8 bpp gray, rgb or colormapped) pixs2 (8 bpp gray, rgb or colormapped) pixg (8 bpp gray, for transparency of pixs2; can be null) x, y (UL corner of pixg with respect to pixs1) Return: pixd (blended image), or null on error</p>
<p>Notes: (1) The result is 8 bpp grayscale if both pixs1 and pixs2 are 8 bpp gray. Otherwise, the result is 32 bpp rgb. (2) pixg is an 8 bpp transparency image, where 0 is transparent and 255 is opaque. It determines the transparency of pixs2 when applied over pixs1. It can be null if pixs2 is rgb, in which case we use the alpha component of pixs2. (3) If pixg exists, both it and pixs2 must be the same size, and they are applied with both their UL corners at the location (x, y) in pixs1. (4) The pixels in pixd are a combination of those in pixs1 and pixs2, where the amount from pixs2 is proportional to the value of the pixel (p) in pixg, and the amount from pixs1 is proportional to (255 - p). Thus pixg is a transparency image (usually called an alpha blender) where each pixel can be associated with a pixel in pixs2, and determines the amount of the pixs2 pixel in the final result. For example, if pixg is all 0, pixs2 is transparent and the result in pixd is simply pixs1. (5) A typical use is for the pixs2/pixg combination to be a small watermark that is applied to pixs1. </p>
<p>Definition at line <a class="el" href="blend_8c_source.html#l01495">1495</a> of file <a class="el" href="blend_8c_source.html">blend.c</a>.</p>
<p>References <a class="el" href="pix2_8c_source.html#l02076">composeRGBPixel()</a>, <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="pix2_8c_source.html#l02108">extractRGBValues()</a>, <a class="el" href="environ_8h_source.html#l00179">FALSE</a>, <a class="el" href="arrayaccess_8h_source.html#l00118">GET_DATA_BYTE</a>, <a class="el" href="pix_8h_source.html#l00146">L_ALPHA_CHANNEL</a>, <a class="el" href="environ_8h_source.html#l00151">L_MIN</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, <a class="el" href="pix1_8c_source.html#l00440">pixClone()</a>, <a class="el" href="pixconv_8c_source.html#l02453">pixConvertTo32()</a>, <a class="el" href="pixconv_8c_source.html#l02297">pixConvertTo8()</a>, <a class="el" href="pix1_8c_source.html#l00548">pixCopy()</a>, <a class="el" href="pix1_8c_source.html#l00466">pixDestroy()</a>, <a class="el" href="pix1_8c_source.html#l01288">pixGetColormap()</a>, <a class="el" href="pix1_8c_source.html#l01358">pixGetData()</a>, <a class="el" href="pix1_8c_source.html#l00863">pixGetDepth()</a>, <a class="el" href="pix1_8c_source.html#l00898">pixGetDimensions()</a>, <a class="el" href="pix2_8c_source.html#l01883">pixGetRGBComponent()</a>, <a class="el" href="pix1_8c_source.html#l00970">pixGetWpl()</a>, <a class="el" href="pixconv_8c_source.html#l00223">pixRemoveColormap()</a>, <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>, <a class="el" href="pix_8h_source.html#l00181">REMOVE_CMAP_BASED_ON_SRC</a>, and <a class="el" href="arrayaccess_8h_source.html#l00126">SET_DATA_BYTE</a>.</p>
<p>Referenced by <a class="el" href="alphaclean__reg_8c_source.html#l00028">main()</a>.</p>
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<td class="memname"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> pixColorGray </td>
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<td class="paramtype"><a class="el" href="struct_pix.html">PIX</a> * </td>
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<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
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