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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"
- 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)
- };
- // A good size for creating shader contexts on the stack.
- enum {kSkBlitterContextSize = 3332};
- // If alloc is non-nullptr, it will be used to allocate the returned SkShader, and MUST outlive
- // the SkShader.
- sk_sp<SkShader> SkMakeBitmapShader(const SkBitmap& src, SkTileMode, SkTileMode,
- const SkMatrix* localMatrix, SkCopyPixelsMode);
- // 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 SkMatrix* localMatrix, SkCopyPixelsMode);
- /**
- * 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_API 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);
- /**
- * Will attempt to upload and lock the contents of the image as a texture, so that subsequent
- * draws to a gpu-target will come from that texture (and not by looking at the original image
- * src). In particular this is intended to use the texture even if the image's original content
- * changes subsequent to this call (i.e. the src is mutable!).
- *
- * All successful calls must be balanced by an equal number of calls to SkImage_unpinAsTexture().
- *
- * Once in this "pinned" state, the image has all of the same thread restrictions that exist
- * for a natively created gpu image (e.g. SkImage::MakeFromTexture)
- * - all drawing, pinning, unpinning must happen in the same thread as the GrContext.
- *
- * @return true if the image was successfully uploaded and locked into a texture
- */
- bool SkImage_pinAsTexture(const SkImage*, GrContext*);
- /**
- * The balancing call to a successful invokation of SkImage_pinAsTexture. When a balanced number of
- * calls have been made, then the "pinned" texture is free to be purged, etc. This also means that a
- * subsequent "pin" call will look at the original content again, and if its uniqueID/generationID
- * has changed, then a newer texture will be uploaded/pinned.
- *
- * The context passed to unpin must match the one passed to pin.
- */
- void SkImage_unpinAsTexture(const SkImage*, GrContext*);
- /**
- * Returns the bounds of the image relative to its encoded buffer. For all non-lazy images,
- * this returns (0,0,width,height). For a lazy-image, it may return a subset of that rect.
- */
- SkIRect SkImage_getSubset(const SkImage*);
- /**
- * Returns a new image containing the same pixel values as the source, but with a different color
- * space assigned. This performs no color space conversion. Primarily used in tests, to visualize
- * the results of rendering in wide or narrow gamuts.
- */
- sk_sp<SkImage> SkImageMakeRasterCopyAndAssignColorSpace(const SkImage*, SkColorSpace*);
- #endif
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