#include "SkBitmap.h"
#include "SkColorPriv.h"
+static CGBitmapInfo ComputeCGAlphaInfo_RGBA(SkAlphaType at) {
+ CGBitmapInfo info = kCGBitmapByteOrder32Big;
+ switch (at) {
+ case kOpaque_SkAlphaType:
+ case kIgnore_SkAlphaType:
+ info |= kCGImageAlphaNoneSkipLast;
+ break;
+ case kPremul_SkAlphaType:
+ info |= kCGImageAlphaPremultipliedLast;
+ break;
+ case kUnpremul_SkAlphaType:
+ info |= kCGImageAlphaLast;
+ break;
+ }
+ return info;
+}
+
+static CGBitmapInfo ComputeCGAlphaInfo_BGRA(SkAlphaType at) {
+ CGBitmapInfo info = kCGBitmapByteOrder32Little;
+ switch (at) {
+ case kOpaque_SkAlphaType:
+ case kIgnore_SkAlphaType:
+ info |= kCGImageAlphaNoneSkipFirst;
+ break;
+ case kPremul_SkAlphaType:
+ info |= kCGImageAlphaPremultipliedFirst;
+ break;
+ case kUnpremul_SkAlphaType:
+ info |= kCGImageAlphaFirst;
+ break;
+ }
+ return info;
+}
+
static void SkBitmap_ReleaseInfo(void* info, const void* pixelData, size_t size) {
SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(info);
delete bitmap;
// doesn't see quite right. Are they thinking 1555?
*bitsPerComponent = 5;
*info = kCGBitmapByteOrder16Little | kCGImageAlphaNone;
- break;
-#endif
+#else
if (upscaleTo32) {
*upscaleTo32 = true;
}
- // fall through
- case kPMColor_SkColorType:
+ // now treat like RGBA
*bitsPerComponent = 8;
-#if SK_PMCOLOR_BYTE_ORDER(R,G,B,A)
- *info = kCGBitmapByteOrder32Big;
- if (bm.isOpaque()) {
- *info |= kCGImageAlphaNoneSkipLast;
- } else {
- *info |= kCGImageAlphaPremultipliedLast;
- }
-#elif SK_PMCOLOR_BYTE_ORDER(B,G,R,A)
- // Matches the CGBitmapInfo that Apple recommends for best
- // performance, used by google chrome.
- *info = kCGBitmapByteOrder32Little;
- if (bm.isOpaque()) {
- *info |= kCGImageAlphaNoneSkipFirst;
- } else {
- *info |= kCGImageAlphaPremultipliedFirst;
- }
-#else
- // ...add more formats as required...
-#warning Cannot convert SkBitmap to CGImageRef with these shiftmasks. \
-This will probably not work.
- // Legacy behavior. Perhaps turn this into an error at some
- // point.
- *info = kCGBitmapByteOrder32Big;
- if (bm.isOpaque()) {
- *info |= kCGImageAlphaNoneSkipLast;
- } else {
- *info |= kCGImageAlphaPremultipliedLast;
- }
+ *info = ComputeCGAlphaInfo_RGBA(kOpaque_SkAlphaType);
#endif
break;
+ case kRGBA_8888_SkColorType:
+ *bitsPerComponent = 8;
+ *info = ComputeCGAlphaInfo_RGBA(bm.alphaType());
+ break;
+ case kBGRA_8888_SkColorType:
+ *bitsPerComponent = 8;
+ *info = ComputeCGAlphaInfo_BGRA(bm.alphaType());
+ break;
case kARGB_4444_SkColorType:
*bitsPerComponent = 4;
*info = kCGBitmapByteOrder16Little;
copy = new SkBitmap;
// here we make a ceep copy of the pixels, since CG won't take our
// 565 directly
- bm.copyTo(copy, kPMColor_SkColorType);
+ bm.copyTo(copy, kN32_SkColorType);
} else {
copy = new SkBitmap(bm);
}
output->swap(bitmap);
return true;
}
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+SK_API bool SkCopyPixelsFromCGImage(const SkImageInfo& info, size_t rowBytes, void* pixels,
+ CGImageRef image) {
+ CGBitmapInfo cg_bitmap_info = 0;
+ size_t bitsPerComponent = 0;
+ switch (info.colorType()) {
+ case kRGBA_8888_SkColorType:
+ bitsPerComponent = 8;
+ cg_bitmap_info = ComputeCGAlphaInfo_RGBA(info.alphaType());
+ break;
+ case kBGRA_8888_SkColorType:
+ bitsPerComponent = 8;
+ cg_bitmap_info = ComputeCGAlphaInfo_BGRA(info.alphaType());
+ break;
+ default:
+ return false; // no other colortypes are supported (for now)
+ }
+
+ CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
+ CGContextRef cg = CGBitmapContextCreate(pixels, info.width(), info.height(), bitsPerComponent,
+ rowBytes, cs, cg_bitmap_info);
+ CFRelease(cs);
+ if (NULL == cg) {
+ return false;
+ }
+
+ // use this blend mode, to avoid having to erase the pixels first, and to avoid CG performing
+ // any blending (which could introduce errors and be slower).
+ CGContextSetBlendMode(cg, kCGBlendModeCopy);
+
+ CGContextDrawImage(cg, CGRectMake(0, 0, info.width(), info.height()), image);
+ CGContextRelease(cg);
+ return true;
+}
+
+bool SkCreateBitmapFromCGImage(SkBitmap* dst, CGImageRef image, SkISize* scaleToFit) {
+ const int width = scaleToFit ? scaleToFit->width() : SkToInt(CGImageGetWidth(image));
+ const int height = scaleToFit ? scaleToFit->height() : SkToInt(CGImageGetHeight(image));
+ SkImageInfo info = SkImageInfo::MakeN32Premul(width, height);
+
+ SkBitmap tmp;
+ if (!tmp.allocPixels(info)) {
+ return false;
+ }
+
+ if (!SkCopyPixelsFromCGImage(tmp.info(), tmp.rowBytes(), tmp.getPixels(), image)) {
+ return false;
+ }
+
+ CGImageAlphaInfo cgInfo = CGImageGetAlphaInfo(image);
+ switch (cgInfo) {
+ case kCGImageAlphaNone:
+ case kCGImageAlphaNoneSkipLast:
+ case kCGImageAlphaNoneSkipFirst:
+ SkASSERT(SkBitmap::ComputeIsOpaque(tmp));
+ tmp.setAlphaType(kOpaque_SkAlphaType);
+ break;
+ default:
+ // we don't know if we're opaque or not, so compute it.
+ if (SkBitmap::ComputeIsOpaque(tmp)) {
+ tmp.setAlphaType(kOpaque_SkAlphaType);
+ }
+ }
+
+ *dst = tmp;
+ return true;
+}