81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
#include <Carbon/Carbon.h>
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#include "SkBitmap.h"
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extern CGImageRef SkCreateCGImageRef(const SkBitmap&);
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static const void* SkBitmap_GetBytesPointer(void* info) {
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SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(info);
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bitmap->lockPixels();
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return bitmap->getPixels();
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}
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static void SkBitmap_ReleaseBytePointer(void* info, const void* pointer) {
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SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(info);
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bitmap->unlockPixels();
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}
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static size_t SkBitmap_GetBytesAtPosition(void* info, void* buffer,
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off_t offset, size_t count) {
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SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(info);
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bitmap->lockPixels();
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memcpy(buffer, (const char*)bitmap->getPixels() + offset, count);
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bitmap->unlockPixels();
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return count;
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}
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static void SkBitmap_ReleaseInfo(void* info) {
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SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(info);
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delete bitmap;
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}
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static SkBitmap* prepareForImageRef(const SkBitmap& bm,
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size_t* bitsPerComponent,
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CGBitmapInfo* info) {
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switch (bm.config()) {
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case SkBitmap::kARGB_8888_Config:
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*bitsPerComponent = 8;
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// try to match our argb ordering in SkColorPriv
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*info = kCGBitmapByteOrder32Big |
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kCGImageAlphaPremultipliedLast;
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break;
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default:
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return NULL;
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}
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return new SkBitmap(bm);
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}
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CGImageRef SkCreateCGImageRef(const SkBitmap& bm) {
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size_t bitsPerComponent;
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CGBitmapInfo info;
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SkBitmap* bitmap = prepareForImageRef(bm, &bitsPerComponent, &info);
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if (NULL == bitmap) {
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return NULL;
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}
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const int w = bitmap->width();
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const int h = bitmap->height();
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const size_t s = bitmap->getSize();
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CGDataProviderDirectCallbacks procs;
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procs.version = 0;
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procs.getBytePointer = SkBitmap_GetBytesPointer;
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procs.releaseBytePointer = SkBitmap_ReleaseBytePointer;
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procs.getBytesAtPosition = SkBitmap_GetBytesAtPosition;
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procs.releaseInfo = SkBitmap_ReleaseInfo;
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// our provider "owns" the bitmap*, and will take care of deleting it
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CGDataProviderRef dataRef = CGDataProviderCreateDirect(bitmap, s, &procs);
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CGColorSpaceRef space = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
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CGImageRef ref = CGImageCreate(w, h, bitsPerComponent,
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bitmap->bytesPerPixel() * 8,
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bitmap->rowBytes(), space, info, dataRef,
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NULL, false, kCGRenderingIntentDefault);
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CGColorSpaceRelease(space);
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CGDataProviderRelease(dataRef);
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return ref;
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}
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