diff options
| -rw-r--r-- | include/core/SkSurface.h | 29 | ||||
| -rw-r--r-- | src/image/SkSurface.cpp | 14 |
2 files changed, 43 insertions, 0 deletions
diff --git a/include/core/SkSurface.h b/include/core/SkSurface.h index 0e238f8429..62d2252af1 100644 --- a/include/core/SkSurface.h +++ b/include/core/SkSurface.h @@ -212,6 +212,35 @@ public: */ const void* peekPixels(SkImageInfo* info, size_t* rowBytes); + /** + * Copy the pixels from the surface into the specified buffer (pixels + rowBytes), + * converting them into the requested format (dstInfo). The base-layer pixels are read + * starting at the specified (srcX,srcY) location in the coordinate system of the base-layer. + * + * The specified ImageInfo and (srcX,srcY) offset specifies a source rectangle + * + * srcR.setXYWH(srcX, srcY, dstInfo.width(), dstInfo.height()); + * + * srcR is intersected with the bounds of the base-layer. If this intersection is not empty, + * then we have two sets of pixels (of equal size). Replace the dst pixels with the + * corresponding src pixels, performing any colortype/alphatype transformations needed + * (in the case where the src and dst have different colortypes or alphatypes). + * + * This call can fail, returning false, for several reasons: + * - If srcR does not intersect the surface bounds. + * - If the requested colortype/alphatype cannot be converted from the base-layer's types. + */ + bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes, + int srcX, int srcY); + + /** + * Helper for allocating pixels and then calling readPixels(info, ...). The bitmap is resized + * to the intersection of srcRect and the surface bounds (if srcRect is non-null). + * On success, pixels will be allocated in bitmap and true returned. On failure, + * false is returned and bitmap will be set to empty. + */ + bool readPixels(SkBitmap* dst, const SkIRect* srcRect = NULL); + const SkSurfaceProps& props() const { return fProps; } protected: diff --git a/src/image/SkSurface.cpp b/src/image/SkSurface.cpp index 3ca5747252..13b7d65546 100644 --- a/src/image/SkSurface.cpp +++ b/src/image/SkSurface.cpp @@ -170,6 +170,20 @@ const void* SkSurface::peekPixels(SkImageInfo* info, size_t* rowBytes) { return this->getCanvas()->peekPixels(info, rowBytes); } +bool SkSurface::readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes, + int srcX, int srcY) { + return this->getCanvas()->readPixels(dstInfo, dstPixels, dstRowBytes, srcX, srcY); +} + +bool SkSurface::readPixels(SkBitmap* dst, const SkIRect* srcRect) { + SkIRect storage; + if (NULL == srcRect) { + storage.set(0, 0, this->width(), this->height()); + srcRect = &storage; + } + return this->getCanvas()->readPixels(*srcRect, dst); +} + ////////////////////////////////////////////////////////////////////////////////////// #ifdef SK_SUPPORT_LEGACY_TEXTRENDERMODE |