diff options
Diffstat (limited to 'src/core/SkConfig8888.cpp')
-rw-r--r-- | src/core/SkConfig8888.cpp | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/src/core/SkConfig8888.cpp b/src/core/SkConfig8888.cpp index 189309dae..b0572c054 100644 --- a/src/core/SkConfig8888.cpp +++ b/src/core/SkConfig8888.cpp @@ -1,5 +1,15 @@ +/* + * Copyright 2014 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "SkBitmap.h" +#include "SkCanvas.h" #include "SkConfig8888.h" #include "SkColorPriv.h" +#include "SkDither.h" #include "SkMathPriv.h" #include "SkUnPreMultiply.h" @@ -115,3 +125,135 @@ bool SkSrcPixelInfo::convertPixelsTo(SkDstPixelInfo* dst, int width, int height) } return true; } + +static void rect_memcpy(void* dst, size_t dstRB, const void* src, size_t srcRB, size_t bytesPerRow, + int rowCount) { + SkASSERT(bytesPerRow <= srcRB); + SkASSERT(bytesPerRow <= dstRB); + for (int i = 0; i < rowCount; ++i) { + memcpy(dst, src, bytesPerRow); + dst = (char*)dst + dstRB; + src = (const char*)src + srcRB; + } +} + +bool SkPixelInfo::CopyPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB, + const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB, + SkColorTable* ctable) { + if (srcInfo.dimensions() != dstInfo.dimensions()) { + return false; + } + + const int width = srcInfo.width(); + const int height = srcInfo.height(); + + // Handle fancy alpha swizzling if both are ARGB32 + if (4 == srcInfo.bytesPerPixel() && 4 == dstInfo.bytesPerPixel()) { + SkDstPixelInfo dstPI; + dstPI.fColorType = dstInfo.colorType(); + dstPI.fAlphaType = dstInfo.alphaType(); + dstPI.fPixels = dstPixels; + dstPI.fRowBytes = dstRB; + + SkSrcPixelInfo srcPI; + srcPI.fColorType = srcInfo.colorType(); + srcPI.fAlphaType = srcInfo.alphaType(); + srcPI.fPixels = srcPixels; + srcPI.fRowBytes = srcRB; + + return srcPI.convertPixelsTo(&dstPI, width, height); + } + + // If they agree on colorType and the alphaTypes are compatible, then we just memcpy. + // Note: we've already taken care of 32bit colortypes above. + if (srcInfo.colorType() == dstInfo.colorType()) { + switch (srcInfo.colorType()) { + case kRGB_565_SkColorType: + case kAlpha_8_SkColorType: + break; + case kIndex_8_SkColorType: + case kARGB_4444_SkColorType: + if (srcInfo.alphaType() != dstInfo.alphaType()) { + return false; + } + break; + default: + return false; + } + rect_memcpy(dstPixels, dstRB, srcPixels, srcRB, width * srcInfo.bytesPerPixel(), height); + return true; + } + + /* + * Begin section where we try to change colorTypes along the way. Not all combinations + * are supported. + */ + + // Can no longer draw directly into 4444, but we can manually whack it for a few combinations + if (kARGB_4444_SkColorType == dstInfo.colorType() && + (kN32_SkColorType == srcInfo.colorType() || kIndex_8_SkColorType == srcInfo.colorType())) { + if (srcInfo.alphaType() == kUnpremul_SkAlphaType) { + // Our method for converting to 4444 assumes premultiplied. + return false; + } + + const SkPMColor* table = NULL; + if (kIndex_8_SkColorType == srcInfo.colorType()) { + if (NULL == ctable) { + return false; + } + table = ctable->lockColors(); + } + + for (int y = 0; y < height; ++y) { + DITHER_4444_SCAN(y); + SkPMColor16* SK_RESTRICT dstRow = (SkPMColor16*)dstPixels; + if (table) { + const uint8_t* SK_RESTRICT srcRow = (const uint8_t*)srcPixels; + for (int x = 0; x < width; ++x) { + dstRow[x] = SkDitherARGB32To4444(table[srcRow[x]], DITHER_VALUE(x)); + } + } else { + const SkPMColor* SK_RESTRICT srcRow = (const SkPMColor*)srcPixels; + for (int x = 0; x < width; ++x) { + dstRow[x] = SkDitherARGB32To4444(srcRow[x], DITHER_VALUE(x)); + } + } + dstPixels = (char*)dstPixels + dstRB; + srcPixels = (const char*)srcPixels + srcRB; + } + + if (table) { + ctable->unlockColors(); + } + return true; + } + + if (dstInfo.alphaType() == kUnpremul_SkAlphaType) { + // We do not support drawing to unpremultiplied bitmaps. + return false; + } + + // Final fall-back, draw with a canvas + // + // Always clear the dest in case one of the blitters accesses it + // TODO: switch the allocation of tmpDst to call sk_calloc_throw + { + SkBitmap bm; + if (!bm.installPixels(srcInfo, const_cast<void*>(srcPixels), srcRB, ctable, NULL, NULL)) { + return false; + } + SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterDirect(dstInfo, dstPixels, dstRB)); + if (NULL == canvas.get()) { + return false; + } + + SkPaint paint; + paint.setDither(true); + + canvas->clear(0); + canvas->drawBitmap(bm, 0, 0, &paint); + return true; + } +} + |