/
rsvg-filter.c
4533 lines (3828 loc) · 153 KB
/
rsvg-filter.c
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/* vim: set sw=4 sts=4: -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/*
rsvg-filter.c: Provides filters
Copyright (C) 2004 Caleb Moore
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Author: Caleb Moore <c.moore@student.unsw.edu.au>
*/
#include "config.h"
#include "rsvg-private.h"
#include "rsvg-filter.h"
#include "rsvg-styles.h"
#include "rsvg-image.h"
#include "rsvg-css.h"
#include <string.h>
#include <math.h>
/*************************************************************/
/*************************************************************/
typedef struct _RsvgFilterPrimitiveOutput RsvgFilterPrimitiveOutput;
struct _RsvgFilterPrimitiveOutput {
GdkPixbuf *result;
RsvgIRect bounds;
gboolean Rused;
gboolean Gused;
gboolean Bused;
gboolean Aused;
};
typedef struct _RsvgFilterContext RsvgFilterContext;
struct _RsvgFilterContext {
gint width, height;
RsvgFilter *filter;
GHashTable *results;
GdkPixbuf *source;
GdkPixbuf *bg;
RsvgFilterPrimitiveOutput lastresult;
double affine[6];
double paffine[6];
int channelmap[4];
RsvgDrawingCtx *ctx;
};
typedef struct _RsvgFilterPrimitive RsvgFilterPrimitive;
struct _RsvgFilterPrimitive {
RsvgNode super;
RsvgLength x, y, width, height;
GString *in;
GString *result;
void (*render) (RsvgFilterPrimitive * self, RsvgFilterContext * ctx);
};
/*************************************************************/
/*************************************************************/
static void
rsvg_filter_primitive_render (RsvgFilterPrimitive * self, RsvgFilterContext * ctx)
{
self->render (self, ctx);
}
static RsvgIRect
rsvg_filter_primitive_get_bounds (RsvgFilterPrimitive * self, RsvgFilterContext * ctx)
{
RsvgBbox box, otherbox;
double affine[6];
_rsvg_affine_identity (affine);
rsvg_bbox_init (&box, affine);
rsvg_bbox_init (&otherbox, ctx->affine);
otherbox.virgin = 0;
if (ctx->filter->filterunits == objectBoundingBox)
_rsvg_push_view_box (ctx->ctx, 1., 1.);
otherbox.x = _rsvg_css_normalize_length (&ctx->filter->x, ctx->ctx, 'h');
otherbox.y = _rsvg_css_normalize_length (&ctx->filter->y, ctx->ctx, 'v');
otherbox.w = _rsvg_css_normalize_length (&ctx->filter->width, ctx->ctx, 'h');
otherbox.h = _rsvg_css_normalize_length (&ctx->filter->height, ctx->ctx, 'v');
if (ctx->filter->filterunits == objectBoundingBox)
_rsvg_pop_view_box (ctx->ctx);
rsvg_bbox_insert (&box, &otherbox);
if (self != NULL)
if (self->x.factor != 'n' || self->y.factor != 'n' ||
self->width.factor != 'n' || self->height.factor != 'n') {
rsvg_bbox_init (&otherbox, ctx->paffine);
otherbox.virgin = 0;
if (ctx->filter->primitiveunits == objectBoundingBox)
_rsvg_push_view_box (ctx->ctx, 1., 1.);
if (self->x.factor != 'n')
otherbox.x = _rsvg_css_normalize_length (&self->x, ctx->ctx, 'h');
else
otherbox.x = 0;
if (self->y.factor != 'n')
otherbox.y = _rsvg_css_normalize_length (&self->y, ctx->ctx, 'v');
else
otherbox.y = 0;
if (self->width.factor != 'n')
otherbox.w = _rsvg_css_normalize_length (&self->width, ctx->ctx, 'h');
else
otherbox.w = ctx->ctx->vb.w;
if (self->height.factor != 'n')
otherbox.h = _rsvg_css_normalize_length (&self->height, ctx->ctx, 'v');
else
otherbox.h = ctx->ctx->vb.h;
if (ctx->filter->primitiveunits == objectBoundingBox)
_rsvg_pop_view_box (ctx->ctx);
rsvg_bbox_clip (&box, &otherbox);
}
rsvg_bbox_init (&otherbox, affine);
otherbox.virgin = 0;
otherbox.x = 0;
otherbox.y = 0;
otherbox.w = ctx->width;
otherbox.h = ctx->height;
rsvg_bbox_clip (&box, &otherbox);
{
RsvgIRect output = { box.x, box.y,
box.x + box.w,
box.y + box.h
};
return output;
}
}
GdkPixbuf *
_rsvg_pixbuf_new_cleared (GdkColorspace colorspace, gboolean has_alpha, int bits_per_sample,
int width, int height)
{
GdkPixbuf *pb;
guchar *data;
pb = gdk_pixbuf_new (colorspace, has_alpha, bits_per_sample, width, height);
data = gdk_pixbuf_get_pixels (pb);
memset (data, 0, width * height * 4);
return pb;
}
static guchar
gdk_pixbuf_get_interp_pixel (guchar * src, gdouble ox, gdouble oy, guchar ch, RsvgIRect boundarys,
guint rowstride)
{
double xmod, ymod;
double dist1, dist2, dist3, dist4;
double c, c1, c2, c3, c4;
xmod = fmod (ox, 1.0);
ymod = fmod (oy, 1.0);
dist1 = (1 - xmod) * (1 - ymod);
dist2 = (xmod) * (1 - ymod);
dist3 = (xmod) * (ymod);
dist4 = (1 - xmod) * (ymod);
if (floor (ox) <= boundarys.x0 || floor (ox) >= boundarys.x1 ||
floor (oy) <= boundarys.y0 || floor (oy) >= boundarys.y1)
c1 = 0;
else
c1 = src[(guint) floor (oy) * rowstride + (guint) floor (ox) * 4 + ch];
if (ceil (ox) <= boundarys.x0 || ceil (ox) >= boundarys.x1 ||
floor (oy) <= boundarys.y0 || floor (oy) >= boundarys.y1)
c2 = 0;
else
c2 = src[(guint) floor (oy) * rowstride + (guint) ceil (ox) * 4 + ch];
if (ceil (ox) <= boundarys.x0 || ceil (ox) >= boundarys.x1 ||
ceil (oy) <= boundarys.y0 || ceil (oy) >= boundarys.y1)
c3 = 0;
else
c3 = src[(guint) ceil (oy) * rowstride + (guint) ceil (ox) * 4 + ch];
if (floor (ox) <= boundarys.x0 || floor (ox) >= boundarys.x1 ||
ceil (oy) <= boundarys.y0 || ceil (oy) >= boundarys.y1)
c4 = 0;
else
c4 = src[(guint) ceil (oy) * rowstride + (guint) floor (ox) * 4 + ch];
c = (c1 * dist1 + c2 * dist2 + c3 * dist3 + c4 * dist4) / (dist1 + dist2 + dist3 + dist4);
return (guchar) c;
}
static void
rsvg_filter_fix_coordinate_system (RsvgFilterContext * ctx, RsvgState * state, RsvgBbox bbox)
{
int x, y, height, width;
int i;
x = bbox.x;
y = bbox.y;
width = bbox.w;
height = bbox.h;
ctx->width = gdk_pixbuf_get_width (ctx->source);
ctx->height = gdk_pixbuf_get_height (ctx->source);
for (i = 0; i < 6; i++)
ctx->affine[i] = state->affine[i];
if (ctx->filter->filterunits == objectBoundingBox) {
double affine[6] = { width, 0, 0, height, x, y };
_rsvg_affine_multiply (ctx->affine, affine, ctx->affine);
}
for (i = 0; i < 6; i++)
ctx->paffine[i] = state->affine[i];
if (ctx->filter->primitiveunits == objectBoundingBox) {
double affine[6] = { width, 0, 0, height, x, y };
_rsvg_affine_multiply (ctx->paffine, affine, ctx->paffine);
}
}
void
rsvg_alpha_blt (GdkPixbuf * src, gint srcx, gint srcy, gint srcwidth,
gint srcheight, GdkPixbuf * dst, gint dstx, gint dsty)
{
gint rightx;
gint bottomy;
gint dstwidth;
gint dstheight;
gint srcoffsetx;
gint srcoffsety;
gint dstoffsetx;
gint dstoffsety;
gint x, y, srcrowstride, dstrowstride, sx, sy, dx, dy;
guchar *src_pixels, *dst_pixels;
dstheight = srcheight;
dstwidth = srcwidth;
rightx = srcx + srcwidth;
bottomy = srcy + srcheight;
if (rightx > gdk_pixbuf_get_width (src))
rightx = gdk_pixbuf_get_width (src);
if (bottomy > gdk_pixbuf_get_height (src))
bottomy = gdk_pixbuf_get_height (src);
srcwidth = rightx - srcx;
srcheight = bottomy - srcy;
rightx = dstx + dstwidth;
bottomy = dsty + dstheight;
if (rightx > gdk_pixbuf_get_width (dst))
rightx = gdk_pixbuf_get_width (dst);
if (bottomy > gdk_pixbuf_get_height (dst))
bottomy = gdk_pixbuf_get_height (dst);
dstwidth = rightx - dstx;
dstheight = bottomy - dsty;
if (dstwidth < srcwidth)
srcwidth = dstwidth;
if (dstheight < srcheight)
srcheight = dstheight;
if (srcx < 0)
srcoffsetx = 0 - srcx;
else
srcoffsetx = 0;
if (srcy < 0)
srcoffsety = 0 - srcy;
else
srcoffsety = 0;
if (dstx < 0)
dstoffsetx = 0 - dstx;
else
dstoffsetx = 0;
if (dsty < 0)
dstoffsety = 0 - dsty;
else
dstoffsety = 0;
if (dstoffsetx > srcoffsetx)
srcoffsetx = dstoffsetx;
if (dstoffsety > srcoffsety)
srcoffsety = dstoffsety;
srcrowstride = gdk_pixbuf_get_rowstride (src);
dstrowstride = gdk_pixbuf_get_rowstride (dst);
src_pixels = gdk_pixbuf_get_pixels (src);
dst_pixels = gdk_pixbuf_get_pixels (dst);
for (y = srcoffsety; y < srcheight; y++)
for (x = srcoffsetx; x < srcwidth; x++) {
guint a, c, ad, cd, ar, cr, i;
sx = x + srcx;
sy = y + srcy;
dx = x + dstx;
dy = y + dsty;
a = src_pixels[4 * sx + sy * srcrowstride + 3];
if (a) {
ad = dst_pixels[4 * dx + dy * dstrowstride + 3];
ar = a + ad * (255 - a) / 255;
dst_pixels[4 * dx + dy * dstrowstride + 3] = ar;
for (i = 0; i < 3; i++) {
c = src_pixels[4 * sx + sy * srcrowstride + i];
cd = dst_pixels[4 * dx + dy * dstrowstride + i];
cr = c + cd * (255 - a) / 255;
dst_pixels[4 * dx + dy * dstrowstride + i] = cr;
}
}
}
}
void
rsvg_art_affine_image (const GdkPixbuf * img, GdkPixbuf * intermediate,
double *affine, double w, double h)
{
gdouble tmp_affine[6];
gdouble inv_affine[6];
gdouble raw_inv_affine[6];
gint intstride;
gint basestride;
gint basex, basey;
gdouble fbasex, fbasey;
gdouble rawx, rawy;
guchar *intpix;
guchar *basepix;
gint i, j, k, basebpp, ii, jj;
gboolean has_alpha;
gdouble pixsum[4];
gboolean xrunnoff, yrunnoff;
gint iwidth, iheight;
gint width, height;
width = gdk_pixbuf_get_width (img);
height = gdk_pixbuf_get_height (img);
iwidth = gdk_pixbuf_get_width (intermediate);
iheight = gdk_pixbuf_get_height (intermediate);
has_alpha = gdk_pixbuf_get_has_alpha (img);
basestride = gdk_pixbuf_get_rowstride (img);
intstride = gdk_pixbuf_get_rowstride (intermediate);
basepix = gdk_pixbuf_get_pixels (img);
intpix = gdk_pixbuf_get_pixels (intermediate);
basebpp = has_alpha ? 4 : 3;
_rsvg_affine_invert (raw_inv_affine, affine);
/*scale to w and h */
tmp_affine[0] = (double) w;
tmp_affine[3] = (double) h;
tmp_affine[1] = tmp_affine[2] = tmp_affine[4] = tmp_affine[5] = 0;
_rsvg_affine_multiply (tmp_affine, tmp_affine, affine);
_rsvg_affine_invert (inv_affine, tmp_affine);
/*apply the transformation */
for (i = 0; i < iwidth; i++)
for (j = 0; j < iheight; j++) {
fbasex = (inv_affine[0] * (double) i + inv_affine[2] * (double) j +
inv_affine[4]) * (double) width;
fbasey = (inv_affine[1] * (double) i + inv_affine[3] * (double) j +
inv_affine[5]) * (double) height;
basex = floor (fbasex);
basey = floor (fbasey);
rawx = raw_inv_affine[0] * i + raw_inv_affine[2] * j + raw_inv_affine[4];
rawy = raw_inv_affine[1] * i + raw_inv_affine[3] * j + raw_inv_affine[5];
if (rawx < 0 || rawy < 0 || rawx >= w ||
rawy >= h || basex < 0 || basey < 0 || basex >= width || basey >= height) {
for (k = 0; k < 4; k++)
intpix[i * 4 + j * intstride + k] = 0;
} else {
if (basex < 0 || basex + 1 >= width)
xrunnoff = TRUE;
else
xrunnoff = FALSE;
if (basey < 0 || basey + 1 >= height)
yrunnoff = TRUE;
else
yrunnoff = FALSE;
for (k = 0; k < basebpp; k++)
pixsum[k] = 0;
for (ii = 0; ii < 2; ii++)
for (jj = 0; jj < 2; jj++) {
if (basex + ii < 0 || basey + jj < 0
|| basex + ii >= width || basey + jj >= height);
else {
for (k = 0; k < basebpp; k++) {
pixsum[k] +=
(double) basepix[basebpp * (basex + ii) +
(basey + jj) * basestride + k]
* (xrunnoff ? 1 : fabs (fbasex - (double) (basex + (1 - ii))))
* (yrunnoff ? 1 : fabs (fbasey - (double) (basey + (1 - jj))));
}
}
}
for (k = 0; k < basebpp; k++)
intpix[i * 4 + j * intstride + k] = pixsum[k];
if (!has_alpha)
intpix[i * 4 + j * intstride + 3] = 255;
}
}
}
static void
rsvg_filter_free_pair (gpointer value)
{
RsvgFilterPrimitiveOutput *output;
output = (RsvgFilterPrimitiveOutput *) value;
g_object_unref (G_OBJECT (output->result));
g_free (output);
}
/**
* rsvg_filter_render: Copy the source to the bg using a filter.
* @self: a pointer to the filter to use
* @source: a pointer to the source pixbuf
* @bg: the background pixbuf
* @context: the context
*
* This function will create a context for itself, set up the coordinate systems
* execute all its little primatives and then clean up its own mess
**/
GdkPixbuf *
rsvg_filter_render (RsvgFilter * self, GdkPixbuf * source,
GdkPixbuf * bg, RsvgDrawingCtx * context, RsvgBbox * bounds, char *channelmap)
{
RsvgFilterContext *ctx;
RsvgFilterPrimitive *current;
guint i;
GdkPixbuf *out;
ctx = g_new (RsvgFilterContext, 1);
ctx->filter = self;
ctx->source = source;
ctx->bg = bg;
ctx->results = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, rsvg_filter_free_pair);
ctx->ctx = context;
g_object_ref (G_OBJECT (source));
rsvg_filter_fix_coordinate_system (ctx, rsvg_state_current (context), *bounds);
ctx->lastresult.result = source;
ctx->lastresult.Rused = 1;
ctx->lastresult.Gused = 1;
ctx->lastresult.Bused = 1;
ctx->lastresult.Aused = 1;
ctx->lastresult.bounds = rsvg_filter_primitive_get_bounds (NULL, ctx);
for (i = 0; i < 4; i++)
ctx->channelmap[i] = channelmap[i] - '0';
for (i = 0; i < self->super.children->len; i++) {
current = g_ptr_array_index (self->super.children, i);
if (!strncmp (current->super.type->str, "fe", 2))
rsvg_filter_primitive_render (current, ctx);
}
out = ctx->lastresult.result;
g_hash_table_destroy (ctx->results);
g_free (ctx);
return out;
}
/**
* rsvg_filter_store_result: Files a result into a context.
* @name: The name of the result
* @result: The pointer to the result
* @ctx: the context that this was called in
*
* Puts the new result into the hash for easy finding later, also
* Stores it as the last result
**/
static void
rsvg_filter_store_output (GString * name, RsvgFilterPrimitiveOutput result, RsvgFilterContext * ctx)
{
RsvgFilterPrimitiveOutput *store;
g_object_unref (G_OBJECT (ctx->lastresult.result));
store = g_new (RsvgFilterPrimitiveOutput, 1);
*store = result;
if (strcmp (name->str, "")) {
g_object_ref (G_OBJECT (result.result)); /* increments the references for the table */
g_hash_table_insert (ctx->results, g_strdup (name->str), store);
}
g_object_ref (G_OBJECT (result.result)); /* increments the references for the last result */
ctx->lastresult = result;
}
static void
rsvg_filter_store_result (GString * name, GdkPixbuf * result, RsvgFilterContext * ctx)
{
RsvgFilterPrimitiveOutput output;
output.Rused = 1;
output.Gused = 1;
output.Bused = 1;
output.Aused = 1;
output.bounds.x0 = 0;
output.bounds.y0 = 0;
output.bounds.x1 = ctx->width;
output.bounds.y1 = ctx->height;
output.result = result;
rsvg_filter_store_output (name, output, ctx);
}
static GdkPixbuf *
pixbuf_get_alpha (GdkPixbuf * pb, RsvgFilterContext * ctx)
{
guchar *data;
guchar *pbdata;
GdkPixbuf *output;
gsize i, pbsize;
pbsize = gdk_pixbuf_get_width (pb) * gdk_pixbuf_get_height (pb);
output = _rsvg_pixbuf_new_cleared (GDK_COLORSPACE_RGB, 1, 8,
gdk_pixbuf_get_width (pb), gdk_pixbuf_get_height (pb));
data = gdk_pixbuf_get_pixels (output);
pbdata = gdk_pixbuf_get_pixels (pb);
for (i = 0; i < pbsize; i++)
data[i * 4 + ctx->channelmap[3]] = pbdata[i * 4 + ctx->channelmap[3]];
return output;
}
/**
* rsvg_filter_get_in: Gets a pixbuf for a primative.
* @name: The name of the pixbuf
* @ctx: the context that this was called in
*
* Returns a pointer to the result that the name refers to, a special
* Pixbuf if the name is a special keyword or NULL if nothing was found
**/
static RsvgFilterPrimitiveOutput
rsvg_filter_get_result (GString * name, RsvgFilterContext * ctx)
{
RsvgFilterPrimitiveOutput output;
RsvgFilterPrimitiveOutput *outputpointer;
output.bounds.x0 = output.bounds.x1 = output.bounds.y0 = output.bounds.y1 = 0;
if (!strcmp (name->str, "SourceGraphic")) {
g_object_ref (G_OBJECT (ctx->source));
output.result = ctx->source;
output.Rused = output.Gused = output.Bused = output.Aused = 1;
return output;
} else if (!strcmp (name->str, "BackgroundImage")) {
g_object_ref (G_OBJECT (ctx->bg));
output.result = ctx->bg;
output.Rused = output.Gused = output.Bused = output.Aused = 1;
return output;
} else if (!strcmp (name->str, "") || !strcmp (name->str, "none") || !name) {
g_object_ref (G_OBJECT (ctx->lastresult.result));
output = ctx->lastresult;
return output;
} else if (!strcmp (name->str, "SourceAlpha")) {
output.Rused = output.Gused = output.Bused = 0;
output.Aused = 1;
output.result = pixbuf_get_alpha (ctx->source, ctx);
return output;
} else if (!strcmp (name->str, "BackgroundAlpha")) {
output.Rused = output.Gused = output.Bused = 0;
output.Aused = 1;
output.result = pixbuf_get_alpha (ctx->bg, ctx);
return output;
}
outputpointer = (RsvgFilterPrimitiveOutput *) (g_hash_table_lookup (ctx->results, name->str));
if (outputpointer != NULL) {
output = *outputpointer;
g_object_ref (G_OBJECT (output.result));
return output;
}
g_warning (_("%s not found\n"), name->str);
output = ctx->lastresult;
g_object_ref (G_OBJECT (ctx->lastresult.result));
return output;
}
static GdkPixbuf *
rsvg_filter_get_in (GString * name, RsvgFilterContext * ctx)
{
return rsvg_filter_get_result (name, ctx).result;
}
/**
* rsvg_filter_parse: Looks up an allready created filter.
* @defs: a pointer to the hash of definitions
* @str: a string with the name of the filter to be looked up
*
* Returns a pointer to the filter that the name refers to, or NULL
* if none was found
**/
RsvgFilter *
rsvg_filter_parse (const RsvgDefs * defs, const char *str)
{
char *name;
name = rsvg_get_url_string (str);
if (name) {
RsvgNode *val;
val = rsvg_defs_lookup (defs, name);
g_free (name);
if (val && (!strcmp (val->type->str, "filter")))
return (RsvgFilter *) val;
}
return NULL;
}
static void
rsvg_filter_set_args (RsvgNode * self, RsvgHandle * ctx, RsvgPropertyBag * atts)
{
const char *value;
RsvgFilter *filter;
filter = (RsvgFilter *) self;
if (rsvg_property_bag_size (atts)) {
if ((value = rsvg_property_bag_lookup (atts, "filterUnits"))) {
if (!strcmp (value, "userSpaceOnUse"))
filter->filterunits = userSpaceOnUse;
else
filter->filterunits = objectBoundingBox;
}
if ((value = rsvg_property_bag_lookup (atts, "primitiveUnits"))) {
if (!strcmp (value, "objectBoundingBox"))
filter->primitiveunits = objectBoundingBox;
else
filter->primitiveunits = userSpaceOnUse;
}
if ((value = rsvg_property_bag_lookup (atts, "x")))
filter->x = _rsvg_css_parse_length (value);
if ((value = rsvg_property_bag_lookup (atts, "y")))
filter->y = _rsvg_css_parse_length (value);
if ((value = rsvg_property_bag_lookup (atts, "width")))
filter->width = _rsvg_css_parse_length (value);
if ((value = rsvg_property_bag_lookup (atts, "height")))
filter->height = _rsvg_css_parse_length (value);
if ((value = rsvg_property_bag_lookup (atts, "id")))
rsvg_defs_register_name (ctx->priv->defs, value, &filter->super);
}
}
/**
* rsvg_new_filter: Creates a black filter
*
* Creates a blank filter and assigns default values to everything
**/
RsvgNode *
rsvg_new_filter (void)
{
RsvgFilter *filter;
filter = g_new (RsvgFilter, 1);
_rsvg_node_init (&filter->super);
filter->filterunits = objectBoundingBox;
filter->primitiveunits = userSpaceOnUse;
filter->x = _rsvg_css_parse_length ("-10%");
filter->y = _rsvg_css_parse_length ("-10%");
filter->width = _rsvg_css_parse_length ("120%");
filter->height = _rsvg_css_parse_length ("120%");
filter->super.children = g_ptr_array_new ();
filter->super.set_atts = rsvg_filter_set_args;
return (RsvgNode *) filter;
}
/*************************************************************/
/*************************************************************/
typedef enum {
normal, multiply, screen, darken, lighten, softlight,
hardlight, colordodge, colorburn, overlay, exclusion,
difference, hue, saturation, color, luminosity
} RsvgFilterPrimitiveBlendMode;
typedef struct _RsvgFilterPrimitiveBlend RsvgFilterPrimitiveBlend;
struct _RsvgFilterPrimitiveBlend {
RsvgFilterPrimitive super;
RsvgFilterPrimitiveBlendMode mode;
GString *in2;
};
// ## KINGLULU STARTS HERE ##
typedef struct _KingLuluColor KingLuluColor;
struct _KingLuluColor {
double r;
double g;
double b;
};
KingLuluColor kinglulu_set_lum(KingLuluColor c, double l);
KingLuluColor kinglulu_set_sat(KingLuluColor c, double s);
int kinglulu_color_cmp(const void *a, const void *b);
#define KINGLULU_DARKEN(cb, cs) MIN(cb, cs)
#define KINGLULU_MULTIPLY(cb, cs) (cb * cs)
// Got this COLOR BURN formula by trying random things and it seems to be what Illustrator is doing.
// It's however not in the PDF specs. Specs says: if (cs == 0) { cr = 0; }
#define KINGLULU_COLOR_BURN(cb, cs) (cs == 0.0 ? (cb == 1.0 ? 1 : 0) : 1.0 - MIN(1.0, (1 - cb) / cs))
#define KINGLULU_LIGHTEN(cb, cs) MAX(cb, cs)
#define KINGLULU_SCREEN(cb, cs) (cb + cs - cb * cs)
// Got this COLOR DODGE formula by trying random things and it seems to be what Illustrator is doing.
// It's however not in the PDF specs. Specs says: if (cs == 1) { cr = 1; }
#define KINGLULU_COLOR_DODGE(cb, cs) (cs == 1.0 ? (cb == 0.0 ? 0 : 1) : MIN(1, cb / (1 - cs)))
#define KINGLULU_HARDLIGHT(cb, cs) (cs <= 0.5 ? KINGLULU_MULTIPLY(cb, 2 * cs) : KINGLULU_SCREEN(cb, (2 * cs - 1)))
#define KINGLULU_OVERLAY(cb, cs) KINGLULU_HARDLIGHT(cs, cb)
#define KINGLULU_SOFTLIGHT(cb, cs) (cs <= 0.5 ? cb - (1 - 2 * cs) * cb * (1 - cb) : (cb <= 0.25 ? cb + (2 * cs - 1) * ((((16 * cb - 12) * cb + 4) * cb) - cb) : cb + (2 * cs - 1) * (sqrt(cb) - cb)))
#define KINGLULU_EXCLUSION(cb, cs) (cs + cb - 2 * cs * cb)
#define KINGLULU_DIFFERENCE(cb, cs) fabs(cb - cs)
#define KINGLULU_HUE(cb, cs) kinglulu_set_lum(kinglulu_set_sat(cs, KINGLULU_SAT(cb)), KINGLULU_LUM(cb))
#define KINGLULU_SATURATION(cb, cs) kinglulu_set_lum(kinglulu_set_sat(cb, KINGLULU_SAT(cs)), KINGLULU_LUM(cb))
#define KINGLULU_COLOR(cb, cs) kinglulu_set_lum(cs, KINGLULU_LUM(cb))
#define KINGLULU_LUMINOSITY(cb, cs) kinglulu_set_lum(cb, KINGLULU_LUM(cs))
#define KINGLULU_LUM(c) (0.3 * c.r + 0.59 * c.g + 0.11 * c.b)
#define KINGLULU_SAT(c) MAX(MAX(c.r, c.g), c.b) - MIN(MIN(c.r, c.g), c.b)
KingLuluColor
kinglulu_set_lum(KingLuluColor c, double l)
{
double d = l - KINGLULU_LUM(c);
c.r += d;
c.g += d;
c.b += d;
l = KINGLULU_LUM(c);
double n = MIN(MIN(c.r, c.g), c.b);
double x = MAX(MAX(c.r, c.g), c.b);
if (n < 0.0)
{
c.r = l + (((c.r - l) * l) / (l - n));
c.g = l + (((c.g - l) * l) / (l - n));
c.b = l + (((c.b - l) * l) / (l - n));
}
if (x > 1.0)
{
c.r = l + (((c.r - l) * (1 - l)) / (x - l));
c.g = l + (((c.g - l) * (1 - l)) / (x - l));
c.b = l + (((c.b - l) * (1 - l)) / (x - l));
}
return c;
}
int
kinglulu_color_cmp(const void *a, const void *b)
{
return (**(const double **)a > **(const double **)b) - (**(const double **)a < **(const double **)b);
}
KingLuluColor
kinglulu_set_sat(KingLuluColor c, double s)
{
double *components[3] = {&c.r, &c.g, &c.b};
qsort(components, 3, sizeof(components[0]), kinglulu_color_cmp);
if (*components[2] > *components[0]) {
*components[1] = (((*components[1] - *components[0]) * s) / (*components[2] - *components[0]));
*components[2] = s;
}
else
*components[1] = *components[2] = 0.0;
*components[0] = 0.0;
return c;
}
// ## KINGLULU FINISHES HERE ##
static void
rsvg_filter_blend (RsvgFilterPrimitiveBlendMode mode, GdkPixbuf * in, GdkPixbuf * in2,
GdkPixbuf * output, RsvgIRect boundarys, int *channelmap)
{
guchar i;
gint x, y;
gint rowstride, rowstride2, rowstrideo, height, width;
guchar *in_pixels;
guchar *in2_pixels;
guchar *output_pixels;
height = gdk_pixbuf_get_height (in);
width = gdk_pixbuf_get_width (in);
rowstride = gdk_pixbuf_get_rowstride (in);
rowstride2 = gdk_pixbuf_get_rowstride (in2);
rowstrideo = gdk_pixbuf_get_rowstride (output);
output_pixels = gdk_pixbuf_get_pixels (output);
in_pixels = gdk_pixbuf_get_pixels (in);
in2_pixels = gdk_pixbuf_get_pixels (in2);
if (boundarys.x0 < 0)
boundarys.x0 = 0;
if (boundarys.y0 < 0)
boundarys.y1 = 0;
if (boundarys.x1 > width)
boundarys.x1 = width;
if (boundarys.y1 > height)
boundarys.y1 = height;
for (y = boundarys.y0; y < boundarys.y1; y++)
for (x = boundarys.x0; x < boundarys.x1; x++) {
double qs, qb, qr;
qs = (double) in_pixels[4 * x + y * rowstride + channelmap[3]] / 255.0;
qb = (double) in2_pixels[4 * x + y * rowstride2 + channelmap[3]] / 255.0;
qr = qs + qb - qs * qb;
// Separable blend modes
if (mode < hue) {
double cs, cb, cr;
int ch;
for (ch = 0; ch < 3; ch++) {
i = channelmap[ch];
cs = (double) in_pixels[4 * x + y * rowstride + i] / 255.0;
cb = (double) in2_pixels[4 * x + y * rowstride2 + i] / 255.0;
switch (mode) {
case multiply:
cr = KINGLULU_MULTIPLY(cb, cs);
break;
case screen:
cr = KINGLULU_SCREEN(cb, cs);
break;
case darken:
cr = KINGLULU_DARKEN(cb, cs);
break;
case lighten:
cr = KINGLULU_LIGHTEN(cb, cs);
break;
case softlight:
cr = KINGLULU_SOFTLIGHT(cb, cs);
break;
case hardlight:
cr = KINGLULU_HARDLIGHT(cb, cs);
break;
case colordodge:
cr = KINGLULU_COLOR_DODGE(cb, cs);
break;
case colorburn:
cr = KINGLULU_COLOR_BURN(cb, cs);
break;
case overlay:
cr = KINGLULU_OVERLAY(cb, cs);
break;
case exclusion:
cr = KINGLULU_EXCLUSION(cb, cs);
break;
case difference:
cr = KINGLULU_DIFFERENCE(cb, cs);
break;
default:
cr = cs;
break;
}
cr = cr * qs * qb + cs * (1 - qb) + cb * (1 - qs);
output_pixels[4 * x + y * rowstrideo + i] = (guchar) CLAMP(cr * 255, 0, 255);
}
}
// Non-separable blend modes
else {
KingLuluColor cr, cs, cb;
cs.r = (double) in_pixels[4 * x + y * rowstride + channelmap[0]] / 255.0;
cs.g = (double) in_pixels[4 * x + y * rowstride + channelmap[1]] / 255.0;
cs.b = (double) in_pixels[4 * x + y * rowstride + channelmap[2]] / 255.0;
cb.r = (double) in2_pixels[4 * x + y * rowstride + channelmap[0]] / 255.0;
cb.g = (double) in2_pixels[4 * x + y * rowstride + channelmap[1]] / 255.0;
cb.b = (double) in2_pixels[4 * x + y * rowstride + channelmap[2]] / 255.0;
switch (mode) {
case hue:
cr = KINGLULU_HUE(cb, cs);
break;
case saturation:
cr = KINGLULU_SATURATION(cb, cs);
break;
case color:
cr = KINGLULU_COLOR(cb, cs);
break;
case luminosity:
cr = KINGLULU_LUMINOSITY(cb, cs);
break;
default:
cr = cs;
break;
}
cr.r = cr.r * qs * qb + cs.r * (1 - qb) + cb.r * (1 - qs);
cr.g = cr.g * qs * qb + cs.g * (1 - qb) + cb.g * (1 - qs);
cr.b = cr.b * qs * qb + cs.b * (1 - qb) + cb.b * (1 - qs);
output_pixels[4 * x + y * rowstride + channelmap[0]] = (guchar) CLAMP(cr.r * 255, 0, 255);
output_pixels[4 * x + y * rowstride + channelmap[1]] = (guchar) CLAMP(cr.g * 255, 0, 255);
output_pixels[4 * x + y * rowstride + channelmap[2]] = (guchar) CLAMP(cr.b * 255, 0, 255);
}
output_pixels[4 * x + y * rowstrideo + channelmap[3]] = (guchar) CLAMP(qr * 255, 0, 255);
}
}
static void
rsvg_filter_primitive_blend_render (RsvgFilterPrimitive * self, RsvgFilterContext * ctx)
{
RsvgIRect boundarys;
RsvgFilterPrimitiveBlend *upself;
GdkPixbuf *output;
GdkPixbuf *in;
GdkPixbuf *in2;
upself = (RsvgFilterPrimitiveBlend *) self;
boundarys = rsvg_filter_primitive_get_bounds (self, ctx);
in = rsvg_filter_get_in (self->in, ctx);
in2 = rsvg_filter_get_in (upself->in2, ctx);
output =
_rsvg_pixbuf_new_cleared (GDK_COLORSPACE_RGB, 1, 8, gdk_pixbuf_get_width (in),
gdk_pixbuf_get_height (in));
rsvg_filter_blend (upself->mode, in, in2, output, boundarys, ctx->channelmap);
rsvg_filter_store_result (self->result, output, ctx);
g_object_unref (G_OBJECT (in));
g_object_unref (G_OBJECT (in2));
g_object_unref (G_OBJECT (output));
}
void
rsvg_filter_adobe_blend (gint modenum, GdkPixbuf * in, GdkPixbuf * bg, GdkPixbuf * output,
RsvgIRect boundarys, RsvgDrawingCtx * ctx)
{
int standardmap[4] = { 0, 1, 2, 3 };
RsvgFilterPrimitiveBlendMode mode;
mode = normal;
switch (modenum) {
case 0:
mode = normal;
break;
case 1:
mode = multiply;
break;
case 2:
mode = screen;
break;
case 3:
mode = darken;
break;
case 4:
mode = lighten;
break;