Creating functions for uploading a mipmapped texture.

src/gpu/GrGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGpu_DEFINED
 #define GrGpu_DEFINED
 
 #include "GrPipelineBuilder.h"
 #include "GrProgramDesc.h"
 #include "GrStencil.h"
 #include "GrTextureParamsAdjuster.h"
 #include "GrXferProcessor.h"
+#include "SkMipMapLevel.h"
 #include "SkPath.h"
+#include "SkTArray.h"
 
 class GrBatchTracker;
 class GrContext;
 class GrGLContext;
 class GrIndexBuffer;
 class GrNonInstancedVertices;
 class GrPath;
 class GrPathRange;
 class GrPathRenderer;
 class GrPathRendererChain;
@@ skipping 46 matching lines @@
     void markContextDirty(uint32_t state = kAll_GrBackendState) { fResetBits |= state; }
 
     /**
      * Creates a texture object. If kRenderTarget_GrSurfaceFlag the texture can
      * be used as a render target by calling GrTexture::asRenderTarget(). Not all
      * pixel configs can be used as render targets. Support for configs as textures
      * or render targets can be checked using GrCaps.
      *
      * @param desc        describes the texture to be created.
      * @param budgeted    does this texture count against the resource cache budget?
-     * @param srcData     texel data to load texture. Begins with full-size
-     *                    palette data for paletted textures. For compressed
-     *                    formats it contains the compressed pixel data. Otherwise,
-     *                    it contains width*height texels. If nullptr texture data
-     *                    is uninitialized.
-     * @param rowBytes    the number of bytes between consecutive rows. Zero
-     *                    means rows are tightly packed. This field is ignored
-     *                    for compressed formats.
+     * @param texels      array of mipmap levels containing texel data to load.
+     *                    Begins with full-size palette data for paletted textures.
+     *                    For compressed formats it contains the compressed pixel data.
+     *                    Otherwise, it contains width*height texels. If there is only one
+     *                    element and it contains nullptr fTexels, texture data is
+     *                    uninitialized.
+     * @return    The texture object if successful, otherwise nullptr.
+     */
+    GrTexture* createTexture(const GrSurfaceDesc& desc, bool budgeted,
+                             const SkTArray<SkMipMapLevel>& texels);
+
+    /**
+     * This function is a shim which creates a SkTArray<SkMipMapLevel> of size 1.
+     * It then calls createTexture with that SkTArray.
      *
-     * @return    The texture object if successful, otherwise nullptr.
+     * @param srcData  Pointer to the pixel values (optional).
+     * @param rowBytes The number of bytes between rows for the texture. Zero
+     *                 implies tightly packed rows. For compressed pixel configs, this
+     *                 field is ignored.
      */
     GrTexture* createTexture(const GrSurfaceDesc& desc, bool budgeted,
                              const void* srcData, size_t rowBytes);
 
     /**
      * Implements GrContext::wrapBackendTexture
      */
     GrTexture* wrapBackendTexture(const GrBackendTextureDesc&, GrWrapOwnership);
 
     /**
@@ skipping 72 matching lines @@
 
     /**
      * Used to negotiate whether and how an intermediate draw should or must be performed before
      * a readPixels call. If this returns false then GrGpu could not deduce an intermediate draw
      * that would allow a successful readPixels call. The passed width, height, and rowBytes,
      * must be non-zero and already reflect clipping to the src bounds.
      */
     bool getReadPixelsInfo(GrSurface* srcSurface, int readWidth, int readHeight, size_t rowBytes,
                            GrPixelConfig readConfig, DrawPreference*, ReadPixelTempDrawInfo*);
 
-    /** Info struct returned by getWritePixelsInfo about performing an intermediate draw in order 
+    /** Info struct returned by getWritePixelsInfo about performing an intermediate draw in order
         to write pixels to a GrSurface for either performance or correctness reasons. */
     struct WritePixelTempDrawInfo {
         /** If the GrGpu is requesting that the caller upload to an intermediate surface and draw
             that to the dst then this is the descriptor for the intermediate surface. The caller
             should upload the pixels such that the upper left pixel of the upload rect is at 0,0 in
             the intermediate surface.*/
         GrSurfaceDesc   fTempSurfaceDesc;
         /** If set, fTempSurfaceDesc's config will be a R/B swap of the src pixel config. The caller
             should upload the pixels as is such that R and B will be swapped in the intermediate
             surface. When the intermediate is drawn to the dst the shader should swap R/B again
             such that the correct swizzle results in the dst. This is done to work around either
             performance or API restrictions in the backend 3D API implementation. */
         bool            fSwapRAndB;
     };
 
     /**
      * Used to negotiate whether and how an intermediate surface should be used to write pixels to
      * a GrSurface. If this returns false then GrGpu could not deduce an intermediate draw
      * that would allow a successful transfer of the src pixels to the dst. The passed width,
      * height, and rowBytes, must be non-zero and already reflect clipping to the dst bounds.
      */
-    bool getWritePixelsInfo(GrSurface* dstSurface, int width, int height, size_t rowBytes,
+    bool getWritePixelsInfo(GrSurface* dstSurface, int width, int height,
                             GrPixelConfig srcConfig, DrawPreference*, WritePixelTempDrawInfo*);
 
     /**
      * Reads a rectangle of pixels from a render target.
      *
      * @param surface       The surface 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.
@@ skipping 14 matching lines @@
 
     /**
      * Updates the pixels in a rectangle of a surface.
      *
      * @param surface       The surface to write to.
      * @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 between consecutive rows. Zero
-     *                      means rows are tightly packed.
+     * @param texels        array of mipmap levels containing texture data
      */
     bool writePixels(GrSurface* surface,
                      int left, int top, int width, int height,
+                     GrPixelConfig config,
+                     const SkTArray<SkMipMapLevel>& texels);
+
+    /**
+     * This function is a shim which creates a SkTArray<SkMipMapLevel> of size 1.
+     * It then calls writePixels with that SkTArray.
+     *
+     * @param buffer   Pointer to the pixel values (optional).
+     * @param rowBytes The number of bytes between rows of the texture. Zero
+     *                 implies tightly packed rows. For compressed pixel configs, this
+     *                 field is ignored.
+     */
+    bool writePixels(GrSurface* surface,
+                     int left, int top, int width, int height,
                      GrPixelConfig config, const void* buffer,
                      size_t rowBytes);
 
     /**
      * Clear the passed in render target. Ignores the draw state and clip.
      */
     void clear(const SkIRect& rect, GrColor color, GrRenderTarget* renderTarget);
 
 
     void clearStencilClip(const SkIRect& rect, bool insideClip, GrRenderTarget* renderTarget);
@@ skipping 170 matching lines @@
     virtual void onResetContext(uint32_t resetBits) = 0;
 
     // Called before certain draws in order to guarantee coherent results from dst reads.
     virtual void xferBarrier(GrRenderTarget*, GrXferBarrierType) = 0;
 
     // overridden by backend-specific derived class to create objects.
     // Texture size and sample size will have already been validated in base class before
     // onCreateTexture/CompressedTexture are called.
     virtual GrTexture* onCreateTexture(const GrSurfaceDesc& desc,
                                        GrGpuResource::LifeCycle lifeCycle,
-                                       const void* srcData, size_t rowBytes) = 0;
+                                       const SkTArray<SkMipMapLevel>& texels) = 0;
     virtual GrTexture* onCreateCompressedTexture(const GrSurfaceDesc& desc,
                                                  GrGpuResource::LifeCycle lifeCycle,
-                                                 const void* srcData) = 0;
+                                                 const SkTArray<SkMipMapLevel>& texels) = 0;
+
     virtual GrTexture* onWrapBackendTexture(const GrBackendTextureDesc&, GrWrapOwnership) = 0;
     virtual GrRenderTarget* onWrapBackendRenderTarget(const GrBackendRenderTargetDesc&,
                                                       GrWrapOwnership) = 0;
     virtual GrVertexBuffer* onCreateVertexBuffer(size_t size, bool dynamic) = 0;
     virtual GrIndexBuffer* onCreateIndexBuffer(size_t size, bool dynamic) = 0;
 
     // overridden by backend-specific derived class to perform the clear.
     virtual void onClear(GrRenderTarget*, const SkIRect& rect, GrColor color) = 0;
 
 
     // Overridden by backend specific classes to perform a clear of the stencil clip bits.  This is
     // ONLY used by the the clip target
     virtual void onClearStencilClip(GrRenderTarget*, const SkIRect& rect, bool insideClip) = 0;
 
     // overridden by backend-specific derived class to perform the draw call.
     virtual void onDraw(const DrawArgs&, const GrNonInstancedVertices&) = 0;
 
     virtual bool onGetReadPixelsInfo(GrSurface* srcSurface, int readWidth, int readHeight,
                                      size_t rowBytes, GrPixelConfig readConfig, DrawPreference*,
                                      ReadPixelTempDrawInfo*) = 0;
-    virtual bool onGetWritePixelsInfo(GrSurface* dstSurface, int width, int height, size_t rowBytes,
+    virtual bool onGetWritePixelsInfo(GrSurface* dstSurface, int width, int height,
                                       GrPixelConfig srcConfig, DrawPreference*,
                                       WritePixelTempDrawInfo*) = 0;
 
     // overridden by backend-specific derived class to perform the surface read
     virtual bool onReadPixels(GrSurface*,
                               int left, int top,
                               int width, int height,
                               GrPixelConfig,
                               void* buffer,
                               size_t rowBytes) = 0;
 
     // overridden by backend-specific derived class to perform the surface write
     virtual bool onWritePixels(GrSurface*,
                                int left, int top, int width, int height,
-                               GrPixelConfig config, const void* buffer,
-                               size_t rowBytes) = 0;
+                               GrPixelConfig config,
+                               const SkTArray<SkMipMapLevel>& texels) = 0;
 
     // overridden by backend-specific derived class to perform the resolve
     virtual void onResolveRenderTarget(GrRenderTarget* target) = 0;
 
     // overridden by backend specific derived class to perform the copy surface
     virtual bool onCopySurface(GrSurface* dst,
                                GrSurface* src,
                                const SkIRect& srcRect,
                                const SkIPoint& dstPoint) = 0;
 
     void resetContext() {
         this->onResetContext(fResetBits);
         fResetBits = 0;
         ++fResetTimestamp;
     }
 
     ResetTimestamp                                                      fResetTimestamp;
     uint32_t                                                            fResetBits;
     // The context owns us, not vice-versa, so this ptr is not ref'ed by Gpu.
     GrContext*                                                          fContext;
 
     friend class GrPathRendering;
     typedef SkRefCnt INHERITED;
 };
 
 #endif