1 files changed, 129 insertions, 0 deletions
diff --git a/src/utils/mac/SkCreateCGImageRef.cpp b/src/utils/mac/SkCreateCGImageRef.cpp
new file mode 100644
index 0000000..f4bda45
--- /dev/null
+++ b/src/utils/mac/SkCreateCGImageRef.cpp
@@ -0,0 +1,129 @@
+#include "SkCGUtils.h"
+#include "SkBitmap.h"
+#include "SkColorPriv.h"
+
+static void SkBitmap_ReleaseInfo(void* info, const void* pixelData, size_t size) {
+    SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(info);
+    delete bitmap;
+}
+
+#define HAS_ARGB_SHIFTS(a, r, g, b) \
+    (SK_A32_SHIFT == (a) && SK_R32_SHIFT == (r) \
+    && SK_G32_SHIFT == (g) && SK_B32_SHIFT == (b))
+
+static SkBitmap* prepareForImageRef(const SkBitmap& bm,
+                                    size_t* bitsPerComponent,
+                                    CGBitmapInfo* info) {
+    bool upscaleTo32 = false;
+
+    switch (bm.config()) {
+        case SkBitmap::kRGB_565_Config:
+            upscaleTo32 = true;
+            // fall through
+        case SkBitmap::kARGB_8888_Config:
+            *bitsPerComponent = 8;
+#if defined(SK_CPU_LENDIAN) && HAS_ARGB_SHIFTS(24, 0, 8, 16) \
+ || defined(SK_CPU_BENDIAN) && HAS_ARGB_SHIFTS(0, 24, 16, 8)
+            *info = kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast;
+#elif defined(SK_CPU_LENDIAN) && HAS_ARGB_SHIFTS(24, 16, 8, 0) \
+   || defined(SK_CPU_BENDIAN) && HAS_ARGB_SHIFTS(24, 16, 8, 0)
+            // Matches the CGBitmapInfo that Apple recommends for best
+            // performance, used by google chrome.
+            *info = kCGBitmapByteOrder32Little | 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 | kCGImageAlphaPremultipliedLast;
+#endif
+            break;
+#if 0
+        case SkBitmap::kRGB_565_Config:
+            // doesn't see quite right. Are they thinking 1555?
+            *bitsPerComponent = 5;
+            *info = kCGBitmapByteOrder16Little;
+            break;
+#endif
+        case SkBitmap::kARGB_4444_Config:
+            *bitsPerComponent = 4;
+            *info = kCGBitmapByteOrder16Little | kCGImageAlphaPremultipliedLast;
+            break;
+        default:
+            return NULL;
+    }
+
+    SkBitmap* copy;
+    if (upscaleTo32) {
+        copy = new SkBitmap;
+        // here we make a ceep copy of the pixels, since CG won't take our
+        // 565 directly
+        bm.copyTo(copy, SkBitmap::kARGB_8888_Config);
+    } else {
+        copy = new SkBitmap(bm);
+    }
+    return copy;
+}
+
+#undef HAS_ARGB_SHIFTS
+
+CGImageRef SkCreateCGImageRefWithColorspace(const SkBitmap& bm,
+                                            CGColorSpaceRef colorSpace) {
+    size_t bitsPerComponent SK_INIT_TO_AVOID_WARNING;
+    CGBitmapInfo info       SK_INIT_TO_AVOID_WARNING;
+
+    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();
+
+    // our provider "owns" the bitmap*, and will take care of deleting it
+	// we initially lock it, so we can access the pixels. The bitmap will be deleted in the release
+	// proc, which will in turn unlock the pixels
+	bitmap->lockPixels();
+    CGDataProviderRef dataRef = CGDataProviderCreateWithData(bitmap, bitmap->getPixels(), s,
+															 SkBitmap_ReleaseInfo);
+
+    bool releaseColorSpace = false;
+    if (NULL == colorSpace) {
+        colorSpace = CGColorSpaceCreateDeviceRGB();
+        releaseColorSpace = true;
+    }
+
+    CGImageRef ref = CGImageCreate(w, h, bitsPerComponent,
+                                   bitmap->bytesPerPixel() * 8,
+                                   bitmap->rowBytes(), colorSpace, info, dataRef,
+                                   NULL, false, kCGRenderingIntentDefault);
+
+    if (releaseColorSpace) {
+        CGColorSpaceRelease(colorSpace);
+    }
+    CGDataProviderRelease(dataRef);
+    return ref;
+}
+
+void SkCGDrawBitmap(CGContextRef cg, const SkBitmap& bm, float x, float y) {
+    CGImageRef img = SkCreateCGImageRef(bm);
+
+    if (img) {
+        CGRect r = CGRectMake(0, 0, bm.width(), bm.height());
+
+        CGContextSaveGState(cg);
+        CGContextTranslateCTM(cg, x, r.size.height + y);
+        CGContextScaleCTM(cg, 1, -1);
+
+        CGContextDrawImage(cg, r, img);
+
+        CGContextRestoreGState(cg);
+
+        CGImageRelease(img);
+    }
+}
+
+
+