move cg utils out of xcode and into src/include
git-svn-id: http://skia.googlecode.com/svn/trunk@35 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/mac/SkCreateCGImageRef.cpp b/src/utils/mac/SkCreateCGImageRef.cpp
new file mode 100644
index 0000000..001e1fa
--- /dev/null
+++ b/src/utils/mac/SkCreateCGImageRef.cpp
@@ -0,0 +1,80 @@
+#include "SkCGUtils.h"
+#include "SkBitmap.h"
+
+extern CGImageRef SkCreateCGImageRef(const SkBitmap&);
+
+static const void* SkBitmap_GetBytesPointer(void* info) {
+ SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(info);
+ bitmap->lockPixels();
+ return bitmap->getPixels();
+}
+
+static void SkBitmap_ReleaseBytePointer(void* info, const void* pointer) {
+ SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(info);
+ bitmap->unlockPixels();
+}
+
+static size_t SkBitmap_GetBytesAtPosition(void* info, void* buffer,
+ off_t offset, size_t count) {
+ SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(info);
+ bitmap->lockPixels();
+ memcpy(buffer, (const char*)bitmap->getPixels() + offset, count);
+ bitmap->unlockPixels();
+ return count;
+}
+
+static void SkBitmap_ReleaseInfo(void* info) {
+ SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(info);
+ delete bitmap;
+}
+
+static SkBitmap* prepareForImageRef(const SkBitmap& bm,
+ size_t* bitsPerComponent,
+ CGBitmapInfo* info) {
+ switch (bm.config()) {
+ case SkBitmap::kARGB_8888_Config:
+ *bitsPerComponent = 8;
+ // try to match our argb ordering in SkColorPriv
+ *info = kCGBitmapByteOrder32Big |
+ kCGImageAlphaPremultipliedLast;
+ break;
+ default:
+ return NULL;
+ }
+
+ return new SkBitmap(bm);
+}
+
+CGImageRef SkCreateCGImageRef(const SkBitmap& bm) {
+ size_t bitsPerComponent;
+ CGBitmapInfo info;
+
+ SkBitmap* bitmap = prepareForImageRef(bm, &bitsPerComponent, &info);
+ if (NULL == bitmap) {
+ return NULL;
+ }
+
+ const int w = bitmap->width();
+ const int h = bitmap->height();
+ const size_t s = bitmap->getSize();
+
+ CGDataProviderDirectCallbacks procs;
+ procs.version = 0;
+ procs.getBytePointer = SkBitmap_GetBytesPointer;
+ procs.releaseBytePointer = SkBitmap_ReleaseBytePointer;
+ procs.getBytesAtPosition = SkBitmap_GetBytesAtPosition;
+ procs.releaseInfo = SkBitmap_ReleaseInfo;
+
+ // our provider "owns" the bitmap*, and will take care of deleting it
+ CGDataProviderRef dataRef = CGDataProviderCreateDirect(bitmap, s, &procs);
+ CGColorSpaceRef space = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
+ CGImageRef ref = CGImageCreate(w, h, bitsPerComponent,
+ bitmap->bytesPerPixel() * 8,
+ bitmap->rowBytes(), space, info, dataRef,
+ NULL, false, kCGRenderingIntentDefault);
+ CGColorSpaceRelease(space);
+ CGDataProviderRelease(dataRef);
+ return ref;
+}
+
+