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add readPixels to SkSurface (later try to remove it from SkCanvas)

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BUG=skia:
TBR=bsalomon, robertphilips

Review URL: https://codereview.chromium.org/789993002
This commit is contained in:
reed 2014-12-09 14:39:44 -08:00 committed by Commit bot
parent 9a0c7abfd7
commit 7543aa2b36
2 changed files with 43 additions and 0 deletions
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29
include/core/SkSurface.h
View File

@ -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:

14
src/image/SkSurface.cpp
View File

@ -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