diff options
| author |  scroggo@google.com <scroggo@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-08-07 19:16:05 +0000 |
|---|---|---|
| committer | scroggo@google.com <scroggo@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2013-08-07 19:16:05 +0000 |
| commit | 8dc8bc55479eb7895b3f0cf4fb42d9d917b21ee1 (patch) | |
| tree | 7e35b96b7d9a817114efbd5faf9c21229a8275ae /src/core | |
| parent | 0b39619e4bf3c528d70ff459914f0438b3ce22ac (diff) | |
Add downsample from 8888 to 4444.
Extend SkBitmap::copyTo to copy from a source with
SkARGB_8888_Config to a destination bitmap with
SkARGB_4444_Config.
BUG=http://code.google.com/p/chromium/issues/detail?id=245774
R=reed@google.com
Review URL: https://codereview.chromium.org/22350003
git-svn-id: http://skia.googlecode.com/svn/trunk@10621 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'src/core')
| -rw-r--r-- | src/core/SkBitmap.cpp | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp index 9a116dfc2e..d3bbecd706 100644 --- a/src/core/SkBitmap.cpp +++ b/src/core/SkBitmap.cpp @@ -1017,11 +1017,12 @@ bool SkBitmap::canCopyTo(Config dstConfig) const { break; case kA1_Config: case kIndex8_Config: - case kARGB_4444_Config: if (!sameConfigs) { return false; } break; + case kARGB_4444_Config: + return sameConfigs || kARGB_8888_Config == this->config(); default: return false; } @@ -1109,6 +1110,19 @@ bool SkBitmap::copyTo(SkBitmap* dst, Config dstConfig, Allocator* alloc) const { dstP += tmpDst.rowBytes(); } } + } else if (SkBitmap::kARGB_4444_Config == dstConfig + && SkBitmap::kARGB_8888_Config == src->config()) { + SkASSERT(src->height() == tmpDst.height()); + SkASSERT(src->width() == tmpDst.width()); + for (int y = 0; y < src->height(); ++y) { + SkPMColor16* SK_RESTRICT dstRow = (SkPMColor16*) tmpDst.getAddr16(0, y); + SkPMColor* SK_RESTRICT srcRow = (SkPMColor*) src->getAddr32(0, y); + DITHER_4444_SCAN(y); + for (int x = 0; x < src->width(); ++x) { + dstRow[x] = SkDitherARGB32To4444(srcRow[x], + DITHER_VALUE(x)); + } + } } else { // if the src has alpha, we have to clear the dst first if (!src->isOpaque()) { |