diff options
Diffstat (limited to 'src/codec/SkBmpStandardCodec.cpp')
-rw-r--r-- | src/codec/SkBmpStandardCodec.cpp | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/src/codec/SkBmpStandardCodec.cpp b/src/codec/SkBmpStandardCodec.cpp index 46a5715dc9..959e75ba5b 100644 --- a/src/codec/SkBmpStandardCodec.cpp +++ b/src/codec/SkBmpStandardCodec.cpp @@ -36,6 +36,8 @@ SkBmpStandardCodec::SkBmpStandardCodec(int width, int height, const SkEncodedInf SkCodec::Result SkBmpStandardCodec::onGetPixels(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes, const Options& opts, + SkPMColor* inputColorPtr, + int* inputColorCount, int* rowsDecoded) { if (opts.fSubset) { // Subsets are not supported. @@ -46,7 +48,7 @@ SkCodec::Result SkBmpStandardCodec::onGetPixels(const SkImageInfo& dstInfo, return kInvalidScale; } - Result result = this->prepareToDecode(dstInfo, opts); + Result result = this->prepareToDecode(dstInfo, opts, inputColorPtr, inputColorCount); if (kSuccess != result) { return result; } @@ -61,13 +63,20 @@ SkCodec::Result SkBmpStandardCodec::onGetPixels(const SkImageInfo& dstInfo, /* * Process the color table for the bmp input */ - bool SkBmpStandardCodec::createColorTable(SkColorType dstColorType, SkAlphaType dstAlphaType) { + bool SkBmpStandardCodec::createColorTable(SkColorType dstColorType, SkAlphaType dstAlphaType, + int* numColors) { // Allocate memory for color table uint32_t colorBytes = 0; SkPMColor colorTable[256]; if (this->bitsPerPixel() <= 8) { // Inform the caller of the number of colors uint32_t maxColors = 1 << this->bitsPerPixel(); + if (nullptr != numColors) { + // We set the number of colors to maxColors in order to ensure + // safe memory accesses. Otherwise, an invalid pixel could + // access memory outside of our color table array. + *numColors = maxColors; + } // Don't bother reading more than maxColors. const uint32_t numColorsToRead = fNumColors == 0 ? maxColors : SkTMin(fNumColors, maxColors); @@ -182,18 +191,21 @@ void SkBmpStandardCodec::initializeSwizzler(const SkImageInfo& dstInfo, const Op } SkCodec::Result SkBmpStandardCodec::onPrepareToDecode(const SkImageInfo& dstInfo, - const SkCodec::Options& options) { + const SkCodec::Options& options, SkPMColor inputColorPtr[], int* inputColorCount) { if (this->xformOnDecode()) { this->resetXformBuffer(dstInfo.width()); } // Create the color table if necessary and prepare the stream for decode // Note that if it is non-NULL, inputColorCount will be modified - if (!this->createColorTable(dstInfo.colorType(), dstInfo.alphaType())) { + if (!this->createColorTable(dstInfo.colorType(), dstInfo.alphaType(), inputColorCount)) { SkCodecPrintf("Error: could not create color table.\n"); return SkCodec::kInvalidInput; } + // Copy the color table to the client if necessary + copy_color_table(dstInfo, fColorTable.get(), inputColorPtr, inputColorCount); + // Initialize a swizzler this->initializeSwizzler(dstInfo, options); return SkCodec::kSuccess; @@ -279,8 +291,9 @@ int SkBmpStandardCodec::decodeRows(const SkImageInfo& dstInfo, void* dst, size_t void SkBmpStandardCodec::decodeIcoMask(SkStream* stream, const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes) { - // BMP in ICO have transparency, so this cannot be 565. The below code depends - // on the output being an SkPMColor. + // BMP in ICO have transparency, so this cannot be 565, and this mask + // prevents us from using kIndex8. The below code depends on the output + // being an SkPMColor. SkASSERT(kRGBA_8888_SkColorType == dstInfo.colorType() || kBGRA_8888_SkColorType == dstInfo.colorType() || kRGBA_F16_SkColorType == dstInfo.colorType()); |