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* Copyright 2012 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkImagePriv_DEFINED
#define SkImagePriv_DEFINED
#include "include/core/SkImage.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTileMode.h"
class SkPixelRef;
enum SkCopyPixelsMode {
kIfMutable_SkCopyPixelsMode, //!< only copy src pixels if they are marked mutable
kAlways_SkCopyPixelsMode, //!< always copy src pixels (even if they are marked immutable)
kNever_SkCopyPixelsMode, //!< never copy src pixels (even if they are marked mutable)
// Convenience function to return a shader that implements the shader+image behavior defined for
// drawImage/Bitmap where the paint's shader is ignored when the bitmap is a color image, but
// properly compose them together when it is an alpha image. This allows the returned paint to
// be assigned to a paint clone without discarding the original behavior.
sk_sp<SkShader> SkMakeBitmapShaderForPaint(const SkPaint& paint, const SkBitmap& src,
SkTileMode, SkTileMode, const SkSamplingOptions&,
const SkMatrix* localMatrix, SkCopyPixelsMode);
// Given arguments for a call to SkCanvas::drawImageRect, modify the SkPaint and return a
// possibly adjusted 'dst' SkRect such that calling SkCanvas::drawRect(newDst, *paint) produces
// visually equivalent results to the original drawImageRect() call.
SkRect SkModifyPaintAndDstForDrawImageRect(const SkImage* image,
const SkSamplingOptions&,
SkRect src,
SkRect dst,
bool strictSrcSubset,
SkPaint* paint);
* Examines the bitmap to decide if it can share the existing pixelRef, or
* if it needs to make a deep-copy of the pixels.
* The bitmap's pixelref will be shared if either the bitmap is marked as
* immutable, or CopyPixelsMode allows it. Shared pixel refs are also
* locked when kLocked_SharedPixelRefMode is specified.
* Passing kLocked_SharedPixelRefMode allows the image's peekPixels() method
* to succeed, but it will force any lazy decodes/generators to execute if
* they exist on the pixelref.
* It is illegal to call this with a texture-backed bitmap.
* If the bitmap's colortype cannot be converted into a corresponding
* SkImageInfo, or the bitmap's pixels cannot be accessed, this will return
* nullptr.
extern SK_SPI sk_sp<SkImage> SkMakeImageFromRasterBitmap(const SkBitmap&, SkCopyPixelsMode);
// Given an image created from SkNewImageFromBitmap, return its pixelref. This
// may be called to see if the surface and the image share the same pixelref,
// in which case the surface may need to perform a copy-on-write.
extern const SkPixelRef* SkBitmapImageGetPixelRef(const SkImage* rasterImage);