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tkMacOSXImage.c
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tkMacOSXImage.c
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/*
* tkMacOSXImage.c --
*
* The code in this file provides an interface for XImages, and
* implements the nsimage image type.
*
* Copyright © 1995-1997 Sun Microsystems, Inc.
* Copyright © 2001-2009, Apple Inc.
* Copyright © 2005-2009 Daniel A. Steffen <das@users.sourceforge.net>
* Copyright © 2017-2021 Marc Culler.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tkMacOSXPrivate.h"
#include "tkMacOSXConstants.h"
#include "tkMacOSXImage.h"
#include "tkColor.h"
#include "xbytes.h"
/* Pixel formats
*
* Tk uses the XImage structure defined in Xlib.h for storing images. The
* image data in an XImage is a 32-bit aligned array of bytes. Interpretation
* of that data is not specified, but the structure includes parameters which
* provide interpretation hints so that an application can use a family of
* different data structures.
*
* The possible values for the XImage format field are XYBitmap, XYPixmap and
* ZPixmap. The macOS port does not support the XYPixmap format. This means
* that bitmap images are stored as a single bit plane (XYBitmap) and that
* color images are stored as a sequence of pixel values (ZPixmap).
*
* For a ZPixmap, the number of bits allocated to each pixel is specified by
* the bits_per_pixel field of the XImage structure. The functions in this
* module which convert between XImage and native CGImage or NSImage structures
* only support XImages with 32 bits per pixel. The ImageGetPixel and PutPixel
* implementations in this file allow 1, 4, 8, 16 or 32 bits per pixel, however.
*
* In tkImgPhInstance.c the layout used for pixels is determined by the values
* of the red_mask, blue_mask and green_mask fields in the XImage structure.
* The Aqua port always sets red_mask = 0xFF0000, green_mask = 0xFF00, and
* blue_mask = 0xFF. This means that a 32bpp ZPixmap XImage uses ARGB32 pixels,
* with small-endian byte order BGRA. The data array for such an XImage can be
* passed directly to construct a CGBitmapImageRep if one specifies the
* bitmapInfo as kCGBitmapByteOrder32Big | kCGImageAlphaLast.
*
* The structures below describe the bitfields in two common 32 bpp pixel
* layouts. Note that bit field layouts are compiler dependent. The layouts
* shown in the comments are those produced by clang and gcc. Also note
* that kCGBitmapByteOrder32Big is consistently set when creating CGImages or
* CGImageBitmapReps.
*/
/* RGBA32 0xRRGGBBAA (Byte order is RGBA on big-endian systems.)
* This is used by NSBitmapImageRep when the bitmapFormat property is 0,
* the default value.
*/
typedef struct RGBA32pixel_t {
unsigned red: 8;
unsigned green: 8;
unsigned blue: 8;
unsigned alpha: 8;
} RGBA32pixel;
/*
* ARGB32 0xAARRGGBB (Byte order is ARGB on big-endian systems.)
* This is used by Aqua Tk for XImages and by NSBitmapImageReps whose
* bitmapFormat property is NSAlphaFirstBitmapFormat.
*/
typedef struct ARGB32pixel_t {
unsigned blue: 8;
unsigned green: 8;
unsigned red: 8;
unsigned alpha: 8;
} ARGB32pixel;
typedef union pixel32_t {
unsigned int uint;
RGBA32pixel rgba;
ARGB32pixel argb;
} pixel32;
#pragma mark XImage handling
int
_XInitImageFuncPtrs(
TCL_UNUSED(XImage *)) /* image */
{
return 0;
}
/*
*----------------------------------------------------------------------
*
* TkMacOSXCreateCGImageWithXImage --
*
* Create CGImage from XImage, copying the image data. Called
* in Tk_PutImage and (currently) nowhere else.
*
* Results:
* CGImage, release after use.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void ReleaseData(
void *info,
TCL_UNUSED(const void *), /* data */
TCL_UNUSED(size_t)) /* size */
{
ckfree(info);
}
static CGImageRef
TkMacOSXCreateCGImageWithXImage(
XImage *image,
uint32_t bitmapInfo)
{
CGImageRef img = NULL;
size_t bitsPerComponent, bitsPerPixel;
size_t len = image->bytes_per_line * image->height;
const CGFloat *decode = NULL;
CGDataProviderRef provider = NULL;
char *data = NULL;
CGDataProviderReleaseDataCallback releaseData = ReleaseData;
if (image->bits_per_pixel == 1) {
/*
* BW image
*/
/* Reverses the sense of the bits */
static const CGFloat decodeWB[2] = {1, 0};
decode = decodeWB;
bitsPerComponent = 1;
bitsPerPixel = 1;
data = (char *)ckalloc(len);
if (data) {
if (image->bitmap_bit_order != MSBFirst) {
char *srcPtr = image->data + image->xoffset;
char *endPtr = srcPtr + len;
char *destPtr = data;
while (srcPtr < endPtr) {
*destPtr++ = xBitReverseTable[(unsigned char)(*(srcPtr++))];
}
} else {
memcpy(data, image->data + image->xoffset, len);
}
provider = CGDataProviderCreateWithData(data, data, len,
releaseData);
if (!provider) {
ckfree(data);
}
img = CGImageMaskCreate(image->width, image->height,
bitsPerComponent, bitsPerPixel, image->bytes_per_line,
provider, decode, 0);
CGDataProviderRelease(provider);
}
} else if ((image->format == ZPixmap) && (image->bits_per_pixel == 32)) {
/*
* Color image
*/
if (image->width == 0 && image->height == 0) {
/*
* CGCreateImage complains on early macOS releases.
*/
return NULL;
}
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
bitsPerComponent = 8;
bitsPerPixel = 32;
data = (char *)ckalloc(len);
if (data) {
memcpy(data, image->data + image->xoffset, len);
provider = CGDataProviderCreateWithData(data, data, len,
releaseData);
if (!provider) {
ckfree(data);
}
img = CGImageCreate(image->width, image->height, bitsPerComponent,
bitsPerPixel, image->bytes_per_line, colorspace, bitmapInfo,
provider, decode, 0, kCGRenderingIntentDefault);
CGDataProviderRelease(provider);
}
if (colorspace) {
CFRelease(colorspace);
}
} else {
TkMacOSXDbgMsg("Unsupported image type");
}
return img;
}
/*
*----------------------------------------------------------------------
*
* DestroyImage --
*
* Destroys storage associated with an image.
*
* Results:
* None.
*
* Side effects:
* Deallocates the image.
*
*----------------------------------------------------------------------
*/
static int
DestroyImage(
XImage *image)
{
if (image) {
if (image->data) {
ckfree(image->data);
}
ckfree(image);
}
return 0;
}
/*
*----------------------------------------------------------------------
*
* ImageGetPixel --
*
* Get a single pixel from an image.
*
* Results:
* The XColor structure contains an unsigned long field named pixel which
* identifies the color. This function returns the unsigned long that
* would be used as the pixel value of an XColor that has the same red
* green and blue components as the XImage pixel at the specified
* location.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static unsigned long
ImageGetPixel(
XImage *image,
int x,
int y)
{
unsigned char r = 0, g = 0, b = 0;
/*
* Compute 8 bit red green and blue values, which are passed as inputs to
* TkMacOSXRGBPixel to produce the pixel value.
*/
if (image && image->data) {
unsigned char *srcPtr = ((unsigned char*) image->data)
+ (y * image->bytes_per_line)
+ (((image->xoffset + x) * image->bits_per_pixel) / NBBY);
switch (image->bits_per_pixel) {
case 32: /* 8 bits per channel */
{
ARGB32pixel *pixel = (ARGB32pixel *)srcPtr;
r = pixel->red;
g = pixel->green;
b = pixel->blue;
}
break;
case 16: /* 5 bits per channel */
r = (*((unsigned short*) srcPtr) >> 7) & 0xf8;
g = (*((unsigned short*) srcPtr) >> 2) & 0xf8;
b = (*((unsigned short*) srcPtr) << 3) & 0xf8;
break;
case 8: /* 2 bits per channel */
r = (*srcPtr << 2) & 0xc0;
g = (*srcPtr << 4) & 0xc0;
b = (*srcPtr << 6) & 0xc0;
r |= r >> 2 | r >> 4 | r >> 6;
g |= g >> 2 | g >> 4 | g >> 6;
b |= b >> 2 | b >> 4 | b >> 6;
break;
case 4: { /* 1 bit per channel */
unsigned char c = (x % 2) ? *srcPtr : (*srcPtr >> 4);
r = (c & 0x04) ? 0xff : 0;
g = (c & 0x02) ? 0xff : 0;
b = (c & 0x01) ? 0xff : 0;
break;
}
case 1: /* Black-white bitmap. */
r = g = b = ((*srcPtr) & (0x80 >> (x % 8))) ? 0xff : 0;
break;
}
}
return TkMacOSXRGBPixel(r, g, b);
}
/*
*----------------------------------------------------------------------
*
* ImagePutPixel --
*
* Set a single pixel in an image. The pixel is provided as an unsigned
* 32-bit integer. The value of that integer is interpreted by assuming
* that its low-order N bits have the format specified by the XImage,
* where N is equal to the bits_per_pixel field of the XImage.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
ImagePutPixel(
XImage *image,
int x,
int y,
unsigned long pixel)
{
if (image && image->data) {
unsigned char *dstPtr = ((unsigned char*) image->data)
+ (y * image->bytes_per_line)
+ (((image->xoffset + x) * image->bits_per_pixel) / NBBY);
if (image->bits_per_pixel == 32) {
*((unsigned int*) dstPtr) = pixel;
} else {
switch (image->bits_per_pixel) {
case 16:
*((unsigned short*) dstPtr) = pixel & 0xffff;
break;
case 8:
*dstPtr = pixel & 0xff;
break;
case 4: {
*dstPtr = (x % 2) ? ((*dstPtr & 0xf0) | (pixel & 0x0f)) :
((*dstPtr & 0x0f) | ((pixel << 4) & 0xf0));
break;
}
case 1:
*dstPtr = pixel ? (*dstPtr | (0x80 >> (x % 8))) :
(*dstPtr & ~(0x80 >> (x % 8)));
break;
}
}
}
return 0;
}
/*
*----------------------------------------------------------------------
*
* XCreateImage --
*
* Allocates storage for a new XImage.
*
* Results:
* Returns a newly allocated XImage.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
XImage *
XCreateImage(
Display* display,
TCL_UNUSED(Visual*), /* visual */
unsigned int depth,
int format,
int offset,
char* data,
unsigned int width,
unsigned int height,
int bitmap_pad,
int bytes_per_line)
{
XImage *ximage;
LastKnownRequestProcessed(display)++;
ximage = (XImage *)ckalloc(sizeof(XImage));
ximage->height = height;
ximage->width = width;
ximage->depth = depth;
ximage->xoffset = offset;
ximage->format = format;
ximage->data = data;
ximage->obdata = NULL;
if (format == ZPixmap) {
ximage->bits_per_pixel = 32;
ximage->bitmap_unit = 32;
} else {
ximage->bits_per_pixel = 1;
ximage->bitmap_unit = 8;
}
if (bitmap_pad) {
ximage->bitmap_pad = bitmap_pad;
} else {
/*
* Use 16 byte alignment for best Quartz performance.
*/
ximage->bitmap_pad = 128;
}
if (bytes_per_line) {
ximage->bytes_per_line = bytes_per_line;
} else {
ximage->bytes_per_line = ((width * ximage->bits_per_pixel +
(ximage->bitmap_pad - 1)) >> 3) &
~((ximage->bitmap_pad >> 3) - 1);
}
#ifdef WORDS_BIGENDIAN
ximage->byte_order = MSBFirst;
ximage->bitmap_bit_order = MSBFirst;
#else
ximage->byte_order = LSBFirst;
ximage->bitmap_bit_order = LSBFirst;
#endif
ximage->red_mask = 0x00FF0000;
ximage->green_mask = 0x0000FF00;
ximage->blue_mask = 0x000000FF;
ximage->f.create_image = NULL;
ximage->f.destroy_image = DestroyImage;
ximage->f.get_pixel = ImageGetPixel;
ximage->f.put_pixel = ImagePutPixel;
ximage->f.sub_image = NULL;
ximage->f.add_pixel = NULL;
return ximage;
}
/*
*----------------------------------------------------------------------
*
* TkPutImage, XPutImage, TkpPutRGBAImage --
*
* These functions, which all have the same signature, copy a rectangular
* subimage of an XImage into a drawable. TkPutImage is an alias for
* XPutImage, which assumes that the XImage data has the structure of a
* 32bpp ZPixmap in which the image data is an array of 32bit integers
* packed with 8 bit values for the Red Green and Blue channels. The
* fourth byte is ignored. The function TkpPutRGBAImage assumes that the
* XImage data has been extended by using the fourth byte to store an
* 8-bit Alpha value. (The Alpha data is assumed not to pre-multiplied).
* The image is then drawn into the drawable using standard Porter-Duff
* Source Atop Composition (kCGBlendModeSourceAtop in Apple's Core
* Graphics).
*
* The TkpPutRGBAImage function is used by TkImgPhotoDisplay to render photo
* images if the compile-time variable TK_CAN_RENDER_RGBA is defined in
* a platform's tkXXXXPort.h header, as is the case for the macOS Aqua port.
*
* Results:
* These functions return either BadDrawable or Success.
*
* Side effects:
* Draws the image on the specified drawable.
*
*----------------------------------------------------------------------
*/
#define USE_ALPHA (kCGImageAlphaLast | kCGBitmapByteOrder32Big)
#define IGNORE_ALPHA (kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Little)
static int
TkMacOSXPutImage(
uint32_t pixelFormat,
Display* display, /* Display. */
Drawable drawable, /* Drawable to place image on. */
GC gc, /* GC to use. */
XImage* image, /* Image to place. */
int src_x, /* Source X & Y. */
int src_y,
int dest_x, /* Destination X & Y. */
int dest_y,
unsigned int width, /* Same width & height for both */
unsigned int height) /* destination and source. */
{
TkMacOSXDrawingContext dc;
MacDrawable *macDraw = (MacDrawable *)drawable;
int result = Success;
if (width <= 0 || height <= 0) {
return Success; /* Is OK. Nothing to see here, literally. */
}
LastKnownRequestProcessed(display)++;
if (!TkMacOSXSetupDrawingContext(drawable, gc, &dc)) {
return BadDrawable;
}
if (dc.context) {
CGRect bounds, srcRect, dstRect;
CGImageRef img = TkMacOSXCreateCGImageWithXImage(image, pixelFormat);
/*
* The CGContext for a pixmap is RGB only, with A = 0.
*/
if (!(macDraw->flags & TK_IS_PIXMAP)) {
CGContextSetBlendMode(dc.context, kCGBlendModeSourceAtop);
}
if (img) {
bounds = CGRectMake(0, 0, image->width, image->height);
srcRect = CGRectMake(src_x, src_y, width, height);
dstRect = CGRectMake(dest_x, dest_y, width, height);
TkMacOSXDrawCGImage(drawable, gc, dc.context,
img, gc->foreground, gc->background,
bounds, srcRect, dstRect);
CFRelease(img);
} else {
TkMacOSXDbgMsg("Invalid source drawable");
result = BadDrawable;
}
} else {
TkMacOSXDbgMsg("Invalid destination drawable");
result = BadDrawable;
}
TkMacOSXRestoreDrawingContext(&dc);
return result;
}
int XPutImage(
Display* display,
Drawable drawable,
GC gc,
XImage* image,
int src_x,
int src_y,
int dest_x,
int dest_y,
unsigned int width,
unsigned int height) {
return TkMacOSXPutImage(IGNORE_ALPHA, display, drawable, gc, image,
src_x, src_y, dest_x, dest_y, width, height);
}
int TkpPutRGBAImage(
Display* display,
Drawable drawable,
GC gc,
XImage* image,
int src_x,
int src_y,
int dest_x,
int dest_y,
unsigned int width,
unsigned int height) {
return TkMacOSXPutImage(USE_ALPHA, display, drawable, gc, image,
src_x, src_y, dest_x, dest_y, width, height);
}
/*
*----------------------------------------------------------------------
*
* CreateCGImageFromDrawableRect
*
* Extract image data from a MacOSX drawable as a CGImage. The drawable
* may be either a pixmap or a window, but there issues in the case of
* a window.
*
* CreateCGImageFromDrawableRect is called by XGetImage and XCopyArea.
* The Tk core uses these two functions on some platforms in order to
* implement explicit double-buffered drawing -- a pixmap is copied from a
* window, modified using CPU-based graphics composition, and then copied
* back to the window. Platforms, such as macOS, on which the system
* provides double-buffered drawing and GPU-based composition operations
* can avoid calls to XGetImage and XCopyArea from the core by defining
* the compile-time variable TK_NO_DOUBLE_BUFFERING. Nonetheless, these
* two functions are in the stubs table and therefore could be used by
* extensions.
*
* The implementation here does not always work correctly when the source
* is a window. The original version of this function relied on
* [NSBitmapImageRep initWithFocusedViewRect:view_rect] which was
* deprecated by Apple in OSX 10.14 and also required the use of other
* deprecated functions such as [NSView lockFocus]. Apple's suggested
* replacement is [NSView cacheDisplayInRect: toBitmapImageRep:] and that
* is being used here. However, cacheDisplayInRect works by calling
* [NSView drawRect] after setting the current graphics context to be one
* which draws to a bitmap. There are situations in which this can be
* used, e.g. when taking a screenshot of a window. But it cannot be used
* as part of a normal display procedure, using the copy-modify-paste
* paradigm that is the basis of the explicit double-buffering. Since the
* copy operation will call the same display procedure that is calling
* this function via XGetImage or XCopyArea, this would create an infinite
* recursion.
*
* An alternative to the copy-modify-paste paradigm is to use GPU-based
* graphics composition, clipping to the specified rectangle. That is
* the approach that must be followed by display procedures on macOS.
*
* Results:
* Returns an NSBitmapRep representing the image of the given rectangle of
* the given drawable. This object is retained. The caller is responsible
* for releasing it.
*
* NOTE: The x,y coordinates should be relative to a coordinate system
* with origin at the top left, as used by XImage and CGImage, not bottom
* left as used by NSView.
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
static CGImageRef
CreateCGImageFromDrawableRect(
Drawable drawable,
int x,
int y,
unsigned int width,
unsigned int height)
{
MacDrawable *mac_drawable = (MacDrawable *)drawable;
CGContextRef cg_context = NULL;
CGImageRef cg_image = NULL, result = NULL;
if (mac_drawable->flags & TK_IS_PIXMAP) {
cg_context = TkMacOSXGetCGContextForDrawable(drawable);
CGContextRetain(cg_context);
} else {
NSView *view = TkMacOSXGetNSViewForDrawable(mac_drawable);
if (view == nil) {
TkMacOSXDbgMsg("Invalid source drawable");
return NULL;
}
NSSize size = view.frame.size;
NSUInteger view_width = size.width, view_height = size.height;
NSUInteger bytesPerPixel = 4,
bytesPerRow = bytesPerPixel * view_width,
bitsPerComponent = 8;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
cg_context = CGBitmapContextCreate(NULL, view_width, view_height,
bitsPerComponent, bytesPerRow, colorSpace,
kCGImageAlphaPremultipliedLast |
kCGBitmapByteOrder32Big);
CFRelease(colorSpace);
[view.layer renderInContext:cg_context];
}
if (cg_context) {
cg_image = CGBitmapContextCreateImage(cg_context);
CGContextRelease(cg_context);
}
if (cg_image) {
CGRect rect = CGRectMake(x + mac_drawable->xOff, y + mac_drawable->yOff,
width, height);
result = CGImageCreateWithImageInRect(cg_image, rect);
CGImageRelease(cg_image);
}
return result;
}
/*
*----------------------------------------------------------------------
*
* CreatePDFFromDrawableRect
*
* Extract PDF data from a MacOSX drawable.
*
* Results:
* Returns a CFDataRef that can be written to a file.
*
* NOTE: The x,y coordinates should be relative to a coordinate system
* with origin at the bottom left as used by NSView, not top left
* as used by XImage and CGImage.
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
CFDataRef
CreatePDFFromDrawableRect(
Drawable drawable,
int x,
int y,
unsigned int width,
unsigned int height)
{
MacDrawable *mac_drawable = (MacDrawable *)drawable;
NSView *view = TkMacOSXGetNSViewForDrawable(mac_drawable);
if (view == nil) {
TkMacOSXDbgMsg("Invalid source drawable");
return NULL;
}
NSRect bounds, viewSrcRect;
/*
* Get the child window area in NSView coordinates
* (origin at bottom left).
*/
bounds = [view bounds];
viewSrcRect = NSMakeRect(mac_drawable->xOff + x,
bounds.size.height - height - (mac_drawable->yOff + y),
width, height);
NSData *viewData = [view dataWithPDFInsideRect:viewSrcRect];
CFDataRef result = (CFDataRef)viewData;
return result;
}
/*
*----------------------------------------------------------------------
*
* CreateCGImageFromPixmap --
*
* Create a CGImage from an X Pixmap.
*
* Results:
* CGImage, release after use.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static CGImageRef
CreateCGImageFromPixmap(
Drawable pixmap)
{
CGImageRef img = NULL;
CGContextRef context = TkMacOSXGetCGContextForDrawable(pixmap);
if (context) {
img = CGBitmapContextCreateImage(context);
}
return img;
}
/*
*----------------------------------------------------------------------
*
* XGetImage --
*
* This function copies data from a pixmap or window into an XImage. It
* is essentially never used. At one time it was called by
* pTkImgPhotoDisplay, but that is no longer the case. Currently it is
* called two places, one of which is requesting an XY image which we do
* not support. It probably does not work correctly -- see the comments
* for CGImageFromDrawableRect.
*
* Results:
* Returns a newly allocated XImage containing the data from the given
* rectangle of the given drawable, or NULL if the XImage could not be
* constructed.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
XImage *
XGetImage(
Display *display,
Drawable drawable,
int x,
int y,
unsigned int width,
unsigned int height,
TCL_UNUSED(unsigned long), /* plane_mask */
int format)
{
NSBitmapImageRep* bitmapRep = nil;
NSUInteger bitmap_fmt = 0;
XImage* imagePtr = NULL;
char *bitmap = NULL;
int depth = 32, offset = 0, bitmap_pad = 0;
unsigned int bytes_per_row, size, row, n, m;
if (format == ZPixmap) {
CGImageRef cgImage;
if (width == 0 || height == 0) {
return NULL;
}
cgImage = CreateCGImageFromDrawableRect(drawable, x, y, width, height);
if (cgImage) {
bitmapRep = [NSBitmapImageRep alloc];
[bitmapRep initWithCGImage:cgImage];
CFRelease(cgImage);
} else {
TkMacOSXDbgMsg("XGetImage: Failed to construct CGImage");
return NULL;
}
bitmap_fmt = [bitmapRep bitmapFormat];
size = [bitmapRep bytesPerPlane];
bytes_per_row = [bitmapRep bytesPerRow];
if ((bitmap_fmt != 0 && bitmap_fmt != NSAlphaFirstBitmapFormat)
|| [bitmapRep samplesPerPixel] != 4
|| [bitmapRep isPlanar] != 0
|| bytes_per_row < 4 * width
|| size != bytes_per_row * height) {
TkMacOSXDbgMsg("XGetImage: Unrecognized bitmap format");
[bitmapRep release];
return NULL;
}
bitmap = (char *)ckalloc(size);
memcpy(bitmap, (char *)[bitmapRep bitmapData], size);
[bitmapRep release];
for (row = 0, n = 0; row < height; row++, n += bytes_per_row) {
for (m = n; m < n + 4*width; m += 4) {
pixel32 pixel = *((pixel32 *)(bitmap + m));
if (bitmap_fmt == 0) { // default format
/*
* This pixel is in ARGB32 format. We need RGBA32.
*/
pixel32 flipped;
flipped.rgba.red = pixel.argb.red;
flipped.rgba.green = pixel.argb.green;
flipped.rgba.blue = pixel.argb.blue;
flipped.rgba.alpha = pixel.argb.alpha;
*((pixel32 *)(bitmap + m)) = flipped;
} else { // bitmap_fmt = NSAlphaFirstBitmapFormat
*((pixel32 *)(bitmap + m)) = pixel;
}
}
}
imagePtr = XCreateImage(display, NULL, depth, format, offset,
(char*) bitmap, width, height,
bitmap_pad, bytes_per_row);
} else {
/*
* There are some calls to XGetImage in the generic Tk code which pass
* an XYPixmap rather than a ZPixmap. XYPixmaps should be handled
* here.
*/
TkMacOSXDbgMsg("XGetImage does not handle XYPixmaps at the moment.");
}
return imagePtr;
}
/*
*----------------------------------------------------------------------
*
* XCopyArea --
*
* Copies image data from one drawable to another.
*
* Results:
* None.
*
* Side effects:
* Image data is moved from a window or bitmap to a second window or bitmap.
*
*----------------------------------------------------------------------
*/
int
XCopyArea(
Display *display, /* Display. */
Drawable src, /* Source drawable. */
Drawable dst, /* Destination drawable. */
GC gc, /* GC to use. */
int src_x, /* X & Y, width & height */
int src_y, /* define the source rectangle */
unsigned int width, /* that will be copied. */
unsigned int height,
int dest_x, /* Dest X & Y on dest rect. */
int dest_y)
{
TkMacOSXDrawingContext dc;
MacDrawable *srcDraw = (MacDrawable *)src;
CGImageRef img = NULL;
CGRect bounds, srcRect, dstRect;
LastKnownRequestProcessed(display)++;
if (!width || !height) {
return BadDrawable;
}
if (!TkMacOSXSetupDrawingContext(dst, gc, &dc)) {
TkMacOSXDbgMsg("Failed to setup drawing context.");
return BadDrawable;
}
if (!dc.context) {
TkMacOSXDbgMsg("Invalid destination drawable - no context.");
return BadDrawable;
}
if (srcDraw->flags & TK_IS_PIXMAP) {
img = CreateCGImageFromPixmap(src);
} else if (TkMacOSXGetNSWindowForDrawable(src)) {
img = CreateCGImageFromDrawableRect(src, src_x, src_y, width, height);
} else {
TkMacOSXDbgMsg("Invalid source drawable - neither window nor pixmap.");
}
if (img) {
bounds = CGRectMake(0, 0, srcDraw->size.width, srcDraw->size.height);
srcRect = CGRectMake(src_x, src_y, width, height);
dstRect = CGRectMake(dest_x, dest_y, width, height);
TkMacOSXDrawCGImage(dst, gc, dc.context, img,
gc->foreground, gc->background, bounds, srcRect, dstRect);
CFRelease(img);
} else {
TkMacOSXDbgMsg("Failed to construct CGImage.");
}
TkMacOSXRestoreDrawingContext(&dc);
return Success;
}
/*
*----------------------------------------------------------------------
*
* XCopyPlane --
*
* Copies a bitmap from a source drawable to a destination drawable. The
* plane argument specifies which bit plane of the source contains the
* bitmap. Note that this implementation ignores the gc->function.
*
* Results:
* None.
*
* Side effects:
* Changes the destination drawable.
*
*----------------------------------------------------------------------
*/
int
XCopyPlane(
Display *display, /* Display. */
Drawable src, /* Source drawable. */
Drawable dst, /* Destination drawable. */
GC gc, /* GC to use. */
int src_x, /* X & Y, width & height */
int src_y, /* define the source rectangle */
unsigned int width, /* that will be copied. */
unsigned int height,
int dest_x, /* Dest X & Y on dest rect. */
int dest_y,
unsigned long plane) /* Which plane to copy. */
{
TkMacOSXDrawingContext dc;
MacDrawable *srcDraw = (MacDrawable *)src;
MacDrawable *dstDraw = (MacDrawable *)dst;
CGRect bounds, srcRect, dstRect;
LastKnownRequestProcessed(display)++;
if (!width || !height) {
/* TkMacOSXDbgMsg("Drawing of empty area requested"); */
return BadDrawable;
}
if (plane != 1) {
Tcl_Panic("Unexpected plane specified for XCopyPlane");
}
if (srcDraw->flags & TK_IS_PIXMAP) {
if (!TkMacOSXSetupDrawingContext(dst, gc, &dc)) {
return BadDrawable;
}
CGContextRef context = dc.context;
if (context) {
CGImageRef img = CreateCGImageFromPixmap(src);
if (img) {
TkpClipMask *clipPtr = (TkpClipMask *) gc->clip_mask;
unsigned long imageBackground = gc->background;
if (clipPtr && clipPtr->type == TKP_CLIP_PIXMAP) {
srcRect = CGRectMake(src_x, src_y, width, height);
CGImageRef mask = CreateCGImageFromPixmap(
clipPtr->value.pixmap);
CGImageRef submask = CGImageCreateWithImageInRect(
img, srcRect);
CGRect rect = CGRectMake(dest_x, dest_y, width, height);