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ara-mdk / platform / external / skia / d8f575c86838a8f546c90692bfea0bbe30a92dbe / . / include / gpu / GrContext.h
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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrContext_DEFINED
#define GrContext_DEFINED
#include "GrClip.h"
#include "GrPaint.h"
// not strictly needed but requires WK change in LayerTextureUpdaterCanvas to
// remove.
#include "GrRenderTarget.h"
class GrDrawTarget;
class GrFontCache;
class GrGpu;
struct GrGpuStats;
class GrIndexBuffer;
class GrIndexBufferAllocPool;
class GrInOrderDrawBuffer;
class GrPathRenderer;
class GrPathRendererChain;
class GrResourceEntry;
class GrResourceCache;
class GrStencilBuffer;
class GrVertexBuffer;
class GrVertexBufferAllocPool;
class GR_API GrContext : public GrRefCnt {
public:
/**
* Creates a GrContext from within a 3D context.
*/
static GrContext* Create(GrEngine engine,
GrPlatform3DContext context3D);
virtual ~GrContext();
/**
* The GrContext normally assumes that no outsider is setting state
* within the underlying 3D API's context/device/whatever. This call informs
* the context that the state was modified and it should resend. Shouldn't
* be called frequently for good performance.
*/
void resetContext();
/**
* Abandons all gpu resources, assumes 3D API state is unknown. Call this
* if you have lost the associated GPU context, and thus internal texture,
* buffer, etc. references/IDs are now invalid. Should be called even when
* GrContext is no longer going to be used for two reasons:
* 1) ~GrContext will not try to free the objects in the 3D API.
* 2) If you've created GrResources that outlive the GrContext they will
* be marked as invalid (GrResource::isValid()) and won't attempt to
* free their underlying resource in the 3D API.
* Content drawn since the last GrContext::flush() may be lost.
*/
void contextLost();
/**
* Similar to contextLost, but makes no attempt to reset state.
* Use this method when GrContext destruction is pending, but
* the graphics context is destroyed first.
*/
void contextDestroyed();
/**
* Frees gpu created by the context. Can be called to reduce GPU memory
* pressure.
*/
void freeGpuResources();
/**
* Returns the number of bytes of GPU memory hosted by the texture cache.
*/
size_t getGpuTextureCacheBytes() const;
///////////////////////////////////////////////////////////////////////////
// Textures
/**
* Token that refers to an entry in the texture cache. Returned by
* functions that lock textures. Passed to unlockTexture.
*/
class SK_API TextureCacheEntry {
public:
TextureCacheEntry() : fEntry(NULL) {}
TextureCacheEntry(const TextureCacheEntry& e) : fEntry(e.fEntry) {}
TextureCacheEntry& operator= (const TextureCacheEntry& e) {
fEntry = e.fEntry;
return *this;
}
GrTexture* texture() const;
void reset() { fEntry = NULL; }
private:
explicit TextureCacheEntry(GrResourceEntry* entry) { fEntry = entry; }
void set(GrResourceEntry* entry) { fEntry = entry; }
GrResourceEntry* cacheEntry() { return fEntry; }
GrResourceEntry* fEntry;
friend class GrContext;
};
/**
* Key generated by client. Should be a unique key on the texture data.
* Does not need to consider that width and height of the texture. Two
* textures with the same TextureKey but different bounds will not collide.
*/
typedef uint64_t TextureKey;
/**
* Create a new entry, based on the specified key and texture, and return
* its "locked" entry. Must call be balanced with an unlockTexture() call.
*
* @param key A client-generated key that identifies the contents
* of the texture. Respecified to findAndLockTexture
* for subsequent uses of the texture.
* @param sampler The sampler state used to draw a texture may be used
* to determine how to store the pixel data in the texture
* cache. (e.g. different versions may exist for different
* wrap modes on GPUs with limited or no NPOT texture
* support). Only the wrap and filter fields are used. NULL
* implies clamp wrap modes and nearest filtering.
* @param desc Description of the texture properties.
* @param srcData Pointer to the pixel values.
* @param rowBytes The number of bytes between rows of the texture. Zero
* implies tightly packed rows.
*/
TextureCacheEntry createAndLockTexture(TextureKey key,
const GrSamplerState* sampler,
const GrTextureDesc& desc,
void* srcData, size_t rowBytes);
/**
* Search for an entry based on key and dimensions. If found, "lock" it and
* return it. The entry's texture() function will return NULL if not found.
* Must be balanced with an unlockTexture() call.
*
* @param key A client-generated key that identifies the contents
* of the texture.
* @param width The width of the texture in pixels as specifed in
* the GrTextureDesc originally passed to
* createAndLockTexture
* @param width The height of the texture in pixels as specifed in
* the GrTextureDesc originally passed to
* createAndLockTexture
* @param sampler The sampler state used to draw a texture may be used
* to determine the cache entry used. (e.g. different
* versions may exist for different wrap modes on GPUs with
* limited or no NPOT texture support). Only the wrap and
* filter fields are used. NULL implies clamp wrap modes
* and nearest filtering.
*/
TextureCacheEntry findAndLockTexture(TextureKey key,
int width,
int height,
const GrSamplerState* sampler);
/**
* Determines whether a texture is in the cache. If the texture is found it
* will not be locked or returned. This call does not affect the priority of
* the texture for deletion.
*/
bool isTextureInCache(TextureKey key,
int width,
int height,
const GrSamplerState*) const;
/**
* Enum that determines how closely a returned scratch texture must match
* a provided GrTextureDesc.
*/
enum ScratchTexMatch {
/**
* Finds a texture that exactly matches the descriptor.
*/
kExact_ScratchTexMatch,
/**
* Finds a texture that approximately matches the descriptor. Will be
* at least as large in width and height as desc specifies. If desc
* specifies that texture is a render target then result will be a
* render target. If desc specifies a render target and doesn't set the
* no stencil flag then result will have a stencil. Format and aa level
* will always match.
*/
kApprox_ScratchTexMatch
};
/**
* Returns a texture matching the desc. It's contents are unknown. Subsequent
* requests with the same descriptor are not guaranteed to return the same
* texture. The same texture is guaranteed not be returned again until it is
* unlocked. Must call be balanced with an unlockTexture() call.
*
* Textures created by createAndLockTexture() hide the complications of
* tiling non-power-of-two textures on APIs that don't support this (e.g.
* unextended GLES2). Tiling a npot texture created by lockScratchTexture on
* such an API will create gaps in the tiling pattern. This includes clamp
* mode. (This may be addressed in a future update.)
*/
TextureCacheEntry lockScratchTexture(const GrTextureDesc& desc, ScratchTexMatch match);
/**
* When done with an entry, call unlockTexture(entry) on it, which returns
* it to the cache, where it may be purged.
*/
void unlockTexture(TextureCacheEntry entry);
/**
* Creates a texture that is outside the cache. Does not count against
* cache's budget.
*/
GrTexture* createUncachedTexture(const GrTextureDesc&,
void* srcData,
size_t rowBytes);
/**
* Returns true if the specified use of an indexed texture is supported.
*/
bool supportsIndex8PixelConfig(const GrSamplerState*,
int width,
int height) const;
/**
* Return the current texture cache limits.
*
* @param maxTextures If non-null, returns maximum number of textures that
* can be held in the cache.
* @param maxTextureBytes If non-null, returns maximum number of bytes of
* texture memory that can be held in the cache.
*/
void getTextureCacheLimits(int* maxTextures, size_t* maxTextureBytes) const;
/**
* Specify the texture cache limits. If the current cache exceeds either
* of these, it will be purged (LRU) to keep the cache within these limits.
*
* @param maxTextures The maximum number of textures that can be held in
* the cache.
* @param maxTextureBytes The maximum number of bytes of texture memory
* that can be held in the cache.
*/
void setTextureCacheLimits(int maxTextures, size_t maxTextureBytes);
/**
* Return the max width or height of a texture supported by the current gpu
*/
int getMaxTextureSize() const;
/**
* Return the max width or height of a render target supported by the
* current gpu
*/
int getMaxRenderTargetSize() const;
///////////////////////////////////////////////////////////////////////////
// Render targets
/**
* Sets the render target.
* @param target the render target to set. (should not be NULL.)
*/
void setRenderTarget(GrRenderTarget* target);
/**
* Gets the current render target.
* @return the currently bound render target. Should never be NULL.
*/
const GrRenderTarget* getRenderTarget() const;
GrRenderTarget* getRenderTarget();
///////////////////////////////////////////////////////////////////////////
// Platform Surfaces
/**
* Wraps an existing texture with a GrTexture object.
*
* OpenGL: if the object is a texture Gr may change its GL texture params
* when it is drawn.
*
* @param desc description of the object to create.
*
* @return GrTexture object or NULL on failure.
*/
GrTexture* createPlatformTexture(const GrPlatformTextureDesc& desc);
/**
* Wraps an existing render target with a GrRenderTarget object. It is
* similar to createPlatformTexture but can be used to draw into surfaces
* that are not also textures (e.g. FBO 0 in OpenGL, or an MSAA buffer that
* the client will resolve to a texture).
*
* @param desc description of the object to create.
*
* @return GrTexture object or NULL on failure.
*/
GrRenderTarget* createPlatformRenderTarget(
const GrPlatformRenderTargetDesc& desc);
///////////////////////////////////////////////////////////////////////////
// Matrix state
/**
* Gets the current transformation matrix.
* @return the current matrix.
*/
const GrMatrix& getMatrix() const;
/**
* Sets the transformation matrix.
* @param m the matrix to set.
*/
void setMatrix(const GrMatrix& m);
/**
* Concats the current matrix. The passed matrix is applied before the
* current matrix.
* @param m the matrix to concat.
*/
void concatMatrix(const GrMatrix& m) const;
///////////////////////////////////////////////////////////////////////////
// Clip state
/**
* Gets the current clip.
* @return the current clip.
*/
const GrClip& getClip() const;
/**
* Sets the clip.
* @param clip the clip to set.
*/
void setClip(const GrClip& clip);
/**
* Convenience method for setting the clip to a rect.
* @param rect the rect to set as the new clip.
*/
void setClip(const GrIRect& rect);
///////////////////////////////////////////////////////////////////////////
// Draws
/**
* Clear the entire or rect of the render target, ignoring any clips.
* @param rect the rect to clear or the whole thing if rect is NULL.
* @param color the color to clear to.
*/
void clear(const GrIRect* rect, GrColor color);
/**
* Draw everywhere (respecting the clip) with the paint.
*/
void drawPaint(const GrPaint& paint);
/**
* Draw the rect using a paint.
* @param paint describes how to color pixels.
* @param strokeWidth If strokeWidth < 0, then the rect is filled, else
* the rect is mitered stroked based on strokeWidth. If
* strokeWidth == 0, then the stroke is always a single
* pixel thick.
* @param matrix Optional matrix applied to the rect. Applied before
* context's matrix or the paint's matrix.
* The rects coords are used to access the paint (through texture matrix)
*/
void drawRect(const GrPaint& paint,
const GrRect&,
GrScalar strokeWidth = -1,
const GrMatrix* matrix = NULL);
/**
* Maps a rect of paint coordinates onto the a rect of destination
* coordinates. Each rect can optionally be transformed. The srcRect
* is stretched over the dstRect. The dstRect is transformed by the
* context's matrix and the srcRect is transformed by the paint's matrix.
* Additional optional matrices can be provided by parameters.
*
* @param paint describes how to color pixels.
* @param dstRect the destination rect to draw.
* @param srcRect rect of paint coordinates to be mapped onto dstRect
* @param dstMatrix Optional matrix to transform dstRect. Applied before
* context's matrix.
* @param srcMatrix Optional matrix to transform srcRect Applied before
* paint's matrix.
*/
void drawRectToRect(const GrPaint& paint,
const GrRect& dstRect,
const GrRect& srcRect,
const GrMatrix* dstMatrix = NULL,
const GrMatrix* srcMatrix = NULL);
/**
* Draws a path.
*
* @param paint describes how to color pixels.
* @param path the path to draw
* @param fill the path filling rule to use.
* @param translate optional additional translation applied to the
* path.
*/
void drawPath(const GrPaint& paint, const GrPath& path, GrPathFill fill,
const GrPoint* translate = NULL);
/**
* Draws vertices with a paint.
*
* @param paint describes how to color pixels.
* @param primitiveType primitives type to draw.
* @param vertexCount number of vertices.
* @param positions array of vertex positions, required.
* @param texCoords optional array of texture coordinates used
* to access the paint.
* @param colors optional array of per-vertex colors, supercedes
* the paint's color field.
* @param indices optional array of indices. If NULL vertices
* are drawn non-indexed.
* @param indexCount if indices is non-null then this is the
* number of indices.
*/
void drawVertices(const GrPaint& paint,
GrPrimitiveType primitiveType,
int vertexCount,
const GrPoint positions[],
const GrPoint texs[],
const GrColor colors[],
const uint16_t indices[],
int indexCount);
///////////////////////////////////////////////////////////////////////////
// Misc.
/**
* Flags that affect flush() behavior.
*/
enum FlushBits {
/**
* A client may want Gr to bind a GrRenderTarget in the 3D API so that
* it can be rendered to directly. However, Gr lazily sets state. Simply
* calling setRenderTarget() followed by flush() without flags may not
* bind the render target. This flag forces the context to bind the last
* set render target in the 3D API.
*/
kForceCurrentRenderTarget_FlushBit = 0x1,
/**
* A client may reach a point where it has partially rendered a frame
* through a GrContext that it knows the user will never see. This flag
* causes the flush to skip submission of deferred content to the 3D API
* during the flush.
*/
kDiscard_FlushBit = 0x2,
};
/**
* Call to ensure all drawing to the context has been issued to the
* underlying 3D API.
* @param flagsBitfield flags that control the flushing behavior. See
* FlushBits.
*/
void flush(int flagsBitfield = 0);
/**
* Reads a rectangle of pixels from a render target.
* @param target the render target to read from. NULL means the
* current render target.
* @param left left edge of the rectangle to read (inclusive)
* @param top top edge of the rectangle to read (inclusive)
* @param width width of rectangle to read in pixels.
* @param height height of rectangle to read in pixels.
* @param config the pixel config of the destination buffer
* @param buffer memory to read the rectangle into.
* @param rowBytes number of bytes bewtween consecutive rows. Zero
* means rows are tightly packed.
*
* @return true if the read succeeded, false if not. The read can fail
* because of an unsupported pixel config or because no render
* target is currently set.
*/
bool readRenderTargetPixels(GrRenderTarget* target,
int left, int top, int width, int height,
GrPixelConfig config, void* buffer,
size_t rowBytes) {
return this->internalReadRenderTargetPixels(target, left, top,
width, height,
config, buffer,
rowBytes, 0);
}
/**
* Copy the src pixels [buffer, rowbytes, pixelconfig] into a render target
* at the specified rectangle.
* @param target the render target to write into. NULL means the
* current render target.
* @param left left edge of the rectangle to write (inclusive)
* @param top top edge of the rectangle to write (inclusive)
* @param width width of rectangle to write in pixels.
* @param height height of rectangle to write in pixels.
* @param config the pixel config of the source buffer
* @param buffer memory to read the rectangle from.
* @param rowBytes number of bytes bewtween consecutive rows. Zero
* means rows are tightly packed.
*/
void writeRenderTargetPixels(GrRenderTarget* target,
int left, int top, int width, int height,
GrPixelConfig config, const void* buffer,
size_t rowBytes) {
this->internalWriteRenderTargetPixels(target, left, top, width, height,
config, buffer, rowBytes, 0);
}
/**
* Reads a rectangle of pixels from a texture.
* @param texture the texture to read from.
* @param left left edge of the rectangle to read (inclusive)
* @param top top edge of the rectangle to read (inclusive)
* @param width width of rectangle to read in pixels.
* @param height height of rectangle to read in pixels.
* @param config the pixel config of the destination buffer
* @param buffer memory to read the rectangle into.
* @param rowBytes number of bytes bewtween consecutive rows. Zero
* means rows are tightly packed.
*
* @return true if the read succeeded, false if not. The read can fail
* because of an unsupported pixel config.
*/
bool readTexturePixels(GrTexture* texture,
int left, int top, int width, int height,
GrPixelConfig config, void* buffer,
size_t rowBytes) {
return this->internalReadTexturePixels(texture, left, top,
width, height,
config, buffer, rowBytes, 0);
}
/**
* Writes a rectangle of pixels to a texture.
* @param texture the render target to read from.
* @param left left edge of the rectangle to write (inclusive)
* @param top top edge of the rectangle to write (inclusive)
* @param width width of rectangle to write in pixels.
* @param height height of rectangle to write in pixels.
* @param config the pixel config of the source buffer
* @param buffer memory to read pixels from
* @param rowBytes number of bytes bewtween consecutive rows. Zero
* means rows are tightly packed.
*/
void writeTexturePixels(GrTexture* texture,
int left, int top, int width, int height,
GrPixelConfig config, const void* buffer,
size_t rowBytes) {
this->internalWriteTexturePixels(texture, left, top, width, height,
config, buffer, rowBytes, 0);
}
/**
* Copies all texels from one texture to another.
* @param src the texture to copy from.
* @param dst the render target to copy to.
*/
void copyTexture(GrTexture* src, GrRenderTarget* dst);
/**
* Resolves a render target that has MSAA. The intermediate MSAA buffer is
* downsampled to the associated GrTexture (accessible via
* GrRenderTarget::asTexture()). Any pending draws to the render target will
* be executed before the resolve.
*
* This is only necessary when a client wants to access the object directly
* using the underlying graphics API. GrContext will detect when it must
* perform a resolve to a GrTexture used as the source of a draw or before
* reading pixels back from a GrTexture or GrRenderTarget.
*/
void resolveRenderTarget(GrRenderTarget* target);
/**
* Applies a 1D convolution kernel in the given direction to a rectangle of
* pixels from a given texture.
* @param texture the texture to read from
* @param rect the destination rectangle
* @param kernel the convolution kernel (kernelWidth elements)
* @param kernelWidth the width of the convolution kernel
* @param direction the direction in which to apply the kernel
*/
void convolve(GrTexture* texture,
const SkRect& rect,
const float* kernel,
int kernelWidth,
GrSamplerState::FilterDirection direction);
/**
* Applies a 1D morphology in the given direction to a rectangle of
* pixels from a given texture.
* @param texture the texture to read from
* @param rect the destination rectangle
* @param radius the radius of the morphological operator
* @param filter the filter kernel (must be kDilate or kErode)
* @param direction the direction in which to apply the morphology
*/
void applyMorphology(GrTexture* texture,
const SkRect& rect,
int radius,
GrSamplerState::Filter filter,
GrSamplerState::FilterDirection direction);
///////////////////////////////////////////////////////////////////////////
// Helpers
class AutoRenderTarget : ::GrNoncopyable {
public:
AutoRenderTarget(GrContext* context, GrRenderTarget* target) {
fContext = NULL;
fPrevTarget = context->getRenderTarget();
if (fPrevTarget != target) {
context->setRenderTarget(target);
fContext = context;
}
}
~AutoRenderTarget() {
if (fContext) {
fContext->setRenderTarget(fPrevTarget);
}
}
private:
GrContext* fContext;
GrRenderTarget* fPrevTarget;
};
///////////////////////////////////////////////////////////////////////////
// Functions intended for internal use only.
GrGpu* getGpu() { return fGpu; }
const GrGpu* getGpu() const { return fGpu; }
GrFontCache* getFontCache() { return fFontCache; }
GrDrawTarget* getTextTarget(const GrPaint& paint);
void flushText();
const GrIndexBuffer* getQuadIndexBuffer() const;
void resetStats();
const GrGpuStats& getStats() const;
void printStats() const;
/**
* Stencil buffers add themselves to the cache using
* addAndLockStencilBuffer. When a SB's RT-attachment count
* reaches zero the SB unlocks itself using unlockStencilBuffer and is
* eligible for purging. findStencilBuffer is called to check the cache for
* a SB that matching an RT's criteria. If a match is found that has been
* unlocked (its attachment count has reached 0) then it will be relocked.
*/
GrResourceEntry* addAndLockStencilBuffer(GrStencilBuffer* sb);
void unlockStencilBuffer(GrResourceEntry* sbEntry);
GrStencilBuffer* findStencilBuffer(int width, int height, int sampleCnt);
private:
// used to keep track of when we need to flush the draw buffer
enum DrawCategory {
kBuffered_DrawCategory, // last draw was inserted in draw buffer
kUnbuffered_DrawCategory, // last draw was not inserted in the draw buffer
kText_DrawCategory // text context was last to draw
};
DrawCategory fLastDrawCategory;
GrGpu* fGpu;
GrResourceCache* fTextureCache;
GrFontCache* fFontCache;
GrPathRendererChain* fPathRendererChain;
GrVertexBufferAllocPool* fDrawBufferVBAllocPool;
GrIndexBufferAllocPool* fDrawBufferIBAllocPool;
GrInOrderDrawBuffer* fDrawBuffer;
GrIndexBuffer* fAAFillRectIndexBuffer;
GrIndexBuffer* fAAStrokeRectIndexBuffer;
GrContext(GrGpu* gpu);
void fillAARect(GrDrawTarget* target,
const GrRect& devRect,
bool useVertexCoverage);
void strokeAARect(GrDrawTarget* target,
const GrRect& devRect,
const GrVec& devStrokeSize,
bool useVertexCoverage);
inline int aaFillRectIndexCount() const;
GrIndexBuffer* aaFillRectIndexBuffer();
inline int aaStrokeRectIndexCount() const;
GrIndexBuffer* aaStrokeRectIndexBuffer();
void setupDrawBuffer();
void flushDrawBuffer();
void setPaint(const GrPaint& paint, GrDrawTarget* target);
GrDrawTarget* prepareToDraw(const GrPaint& paint, DrawCategory drawType);
GrPathRenderer* getPathRenderer(const GrPath& path,
GrPathFill fill,
const GrDrawTarget* target,
bool antiAlias);
/**
* Flags to the internal read/write pixels funcs
*/
enum PixelOpsFlags {
kDontFlush_PixelOpsFlag = 0x1,
};
bool internalReadRenderTargetPixels(GrRenderTarget* target,
int left, int top,
int width, int height,
GrPixelConfig config, void* buffer,
size_t rowBytes, uint32_t flags);
void internalWriteRenderTargetPixels(GrRenderTarget* target,
int left, int top,
int width, int height,
GrPixelConfig, const void* buffer,
size_t rowBytes, uint32_t flags);
bool internalReadTexturePixels(GrTexture* texture,
int left, int top,
int width, int height,
GrPixelConfig config, void* buffer,
size_t rowBytes, uint32_t flags);
void internalWriteTexturePixels(GrTexture* texture,
int left, int top,
int width, int height,
GrPixelConfig config, const void* buffer,
size_t rowBytes, uint32_t flags);
// needed for access to internalWriteTexturePixels. TODO: make GrContext
// be a facade for an internal class. Then functions that are public on the
// internal class would have only be callable in src/gpu. The facade would
// only have to functions necessary for clients.
friend class GrAtlas;
// computes vertex layout bits based on the paint. If paint expresses
// a texture for a stage, the stage coords will be bound to postitions
// unless hasTexCoords[s]==true in which case stage s's input coords
// are bound to tex coord index s. hasTexCoords == NULL is a shortcut
// for an array where all the values are false.
static int PaintStageVertexLayoutBits(
const GrPaint& paint,
const bool hasTexCoords[GrPaint::kTotalStages]);
};
/**
* Save/restore the view-matrix in the context.
*/
class GrAutoMatrix : GrNoncopyable {
public:
GrAutoMatrix() : fContext(NULL) {}
GrAutoMatrix(GrContext* ctx) : fContext(ctx) {
fMatrix = ctx->getMatrix();
}
GrAutoMatrix(GrContext* ctx, const GrMatrix& matrix) : fContext(ctx) {
fMatrix = ctx->getMatrix();
ctx->setMatrix(matrix);
}
void set(GrContext* ctx) {
if (NULL != fContext) {
fContext->setMatrix(fMatrix);
}
fMatrix = ctx->getMatrix();
fContext = ctx;
}
void set(GrContext* ctx, const GrMatrix& matrix) {
if (NULL != fContext) {
fContext->setMatrix(fMatrix);
}
fMatrix = ctx->getMatrix();
ctx->setMatrix(matrix);
fContext = ctx;
}
~GrAutoMatrix() {
if (NULL != fContext) {
fContext->setMatrix(fMatrix);
}
}
private:
GrContext* fContext;
GrMatrix fMatrix;
};
/**
* Gets and locks a scratch texture from a descriptor using
* either exact or approximate criteria. Unlocks texture in
* the destructor.
*/
class GrAutoScratchTexture : ::GrNoncopyable {
public:
GrAutoScratchTexture()
: fContext(NULL) {
}
GrAutoScratchTexture(GrContext* context,
const GrTextureDesc& desc,
GrContext::ScratchTexMatch match =
GrContext::kApprox_ScratchTexMatch)
: fContext(NULL) {
this->set(context, desc, match);
}
~GrAutoScratchTexture() {
if (NULL != fContext) {
fContext->unlockTexture(fEntry);
}
}
GrTexture* set(GrContext* context,
const GrTextureDesc& desc,
GrContext::ScratchTexMatch match =
GrContext::kApprox_ScratchTexMatch) {
if (NULL != fContext) {
fContext->unlockTexture(fEntry);
}
fContext = context;
if (NULL != fContext) {
fEntry = fContext->lockScratchTexture(desc, match);
GrTexture* ret = fEntry.texture();
if (NULL == ret) {
fContext = NULL;
}
return ret;
} else {
return NULL;
}
}
GrTexture* texture() { return fEntry.texture(); }
private:
GrContext* fContext;
GrContext::TextureCacheEntry fEntry;
};
#endif