Split drawing functionality out of GrContext and into new GrDrawContext

src/effects/SkGpuBlurUtils.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGpuBlurUtils.h"
 
 #include "SkRect.h"
 
 #if SK_SUPPORT_GPU
 #include "effects/GrConvolutionEffect.h"
 #include "effects/GrMatrixConvolutionEffect.h"
 #include "GrContext.h"
+#include "GrDrawContext.h"
 #endif
 
 namespace SkGpuBlurUtils {
 
 #if SK_SUPPORT_GPU
 
 #define MAX_BLUR_SIGMA 4.0f
 
 static void scale_rect(SkRect* rect, float xScale, float yScale) {
     rect->fLeft   = SkScalarMul(rect->fLeft,   xScale);
@@ skipping 10 matching lines @@
         if (*scaleFactor > maxTextureSize) {
             *scaleFactor = maxTextureSize;
             sigma = MAX_BLUR_SIGMA;
         }
     }
     *radius = static_cast<int>(ceilf(sigma * 3.0f));
     SkASSERT(*radius <= GrConvolutionEffect::kMaxKernelRadius);
     return sigma;
 }
 
-static void convolve_gaussian_1d(GrContext* context,
+static void convolve_gaussian_1d(GrDrawContext* drawContext,
                                  GrRenderTarget* rt,
                                  const GrClip& clip,
                                  const SkRect& srcRect,
                                  const SkRect& dstRect,
                                  GrTexture* texture,
                                  Gr1DKernelEffect::Direction direction,
                                  int radius,
                                  float sigma,
                                  bool useBounds,
                                  float bounds[2]) {
     GrPaint paint;
     SkAutoTUnref<GrFragmentProcessor> conv(GrConvolutionEffect::CreateGaussian(
         texture, direction, radius, sigma, useBounds, bounds));
     paint.addColorProcessor(conv);
-    context->drawNonAARectToRect(rt, clip, paint, SkMatrix::I(), dstRect, srcRect);
+    drawContext->drawNonAARectToRect(rt, clip, paint, SkMatrix::I(), dstRect, srcRect);
 }
 
-static void convolve_gaussian_2d(GrContext* context,
+static void convolve_gaussian_2d(GrDrawContext* drawContext,
                                  GrRenderTarget* rt,
                                  const GrClip& clip,
                                  const SkRect& srcRect,
                                  const SkRect& dstRect,
                                  GrTexture* texture,
                                  int radiusX,
                                  int radiusY,
                                  SkScalar sigmaX,
                                  SkScalar sigmaY,
                                  bool useBounds,
                                  SkIRect bounds) {
     SkISize size = SkISize::Make(2 * radiusX + 1,  2 * radiusY + 1);
     SkIPoint kernelOffset = SkIPoint::Make(radiusX, radiusY);
     GrPaint paint;
     SkAutoTUnref<GrFragmentProcessor> conv(GrMatrixConvolutionEffect::CreateGaussian(
             texture, bounds, size, 1.0, 0.0, kernelOffset,
             useBounds ? GrTextureDomain::kClamp_Mode : GrTextureDomain::kIgnore_Mode,
             true, sigmaX, sigmaY));
     paint.addColorProcessor(conv);
-    context->drawNonAARectToRect(rt, clip, paint, SkMatrix::I(), dstRect, srcRect);
+    drawContext->drawNonAARectToRect(rt, clip, paint, SkMatrix::I(), dstRect, srcRect);
 }
 
-static void convolve_gaussian(GrContext* context,
+static void convolve_gaussian(GrDrawContext* drawContext,
                               GrRenderTarget* rt,
                               const GrClip& clip,
                               const SkRect& srcRect,
                               const SkRect& dstRect,
                               GrTexture* texture,
                               Gr1DKernelEffect::Direction direction,
                               int radius,
                               float sigma,
                               bool cropToSrcRect) {
     float bounds[2] = { 0.0f, 1.0f };
     if (!cropToSrcRect) {
-        convolve_gaussian_1d(context, rt, clip, srcRect, dstRect, texture,
+        convolve_gaussian_1d(drawContext, rt, clip, srcRect, dstRect, texture,
                              direction, radius, sigma, false, bounds);
         return;
     }
     SkRect lowerSrcRect = srcRect, lowerDstRect = dstRect;
     SkRect middleSrcRect = srcRect, middleDstRect = dstRect;
     SkRect upperSrcRect = srcRect, upperDstRect = dstRect;
     SkScalar size;
     SkScalar rad = SkIntToScalar(radius);
     if (direction == Gr1DKernelEffect::kX_Direction) {
         bounds[0] = SkScalarToFloat(srcRect.left()) / texture->width();
@@ skipping 11 matching lines @@
         size = srcRect.height();
         lowerSrcRect.fBottom = srcRect.top() + rad;
         lowerDstRect.fBottom = dstRect.top() + rad;
         upperSrcRect.fTop = srcRect.bottom() - rad;
         upperDstRect.fTop = dstRect.bottom() - rad;
         middleSrcRect.inset(0, rad);
         middleDstRect.inset(0, rad);
     }
     if (radius >= size * SK_ScalarHalf) {
         // Blur radius covers srcRect; use bounds over entire draw
-        convolve_gaussian_1d(context, rt, clip, srcRect, dstRect, texture,
+        convolve_gaussian_1d(drawContext, rt, clip, srcRect, dstRect, texture,
                             direction, radius, sigma, true, bounds);
     } else {
         // Draw upper and lower margins with bounds; middle without.
-        convolve_gaussian_1d(context, rt, clip, lowerSrcRect, lowerDstRect, texture,
+        convolve_gaussian_1d(drawContext, rt, clip, lowerSrcRect, lowerDstRect, texture,
                              direction, radius, sigma, true, bounds);
-        convolve_gaussian_1d(context, rt, clip, upperSrcRect, upperDstRect, texture,
+        convolve_gaussian_1d(drawContext, rt, clip, upperSrcRect, upperDstRect, texture,
                              direction, radius, sigma, true, bounds);
-        convolve_gaussian_1d(context, rt, clip, middleSrcRect, middleDstRect, texture,
+        convolve_gaussian_1d(drawContext, rt, clip, middleSrcRect, middleDstRect, texture,
                              direction, radius, sigma, false, bounds);
     }
 }
 
 GrTexture* GaussianBlur(GrContext* context,
                         GrTexture* srcTexture,
                         bool canClobberSrc,
                         const SkRect& rect,
                         bool cropToRect,
                         float sigmaX,
@@ skipping 38 matching lines @@
     } else {
         temp2.reset(context->textureProvider()->refScratchTexture(
             desc, GrTextureProvider::kApprox_ScratchTexMatch));
         tempTexture = temp2.get();
     }
 
     if (NULL == dstTexture || NULL == tempTexture) {
         return NULL;
     }
 
+    GrDrawContext* drawContext = context->drawContext();
+    if (!drawContext) {
+        return NULL;
+    }
+
     for (int i = 1; i < scaleFactorX || i < scaleFactorY; i *= 2) {
         GrPaint paint;
         SkMatrix matrix;
         matrix.setIDiv(srcTexture->width(), srcTexture->height());
         SkRect dstRect(srcRect);
         if (cropToRect && i == 1) {
             dstRect.offset(-dstRect.fLeft, -dstRect.fTop);
             SkRect domain;
             matrix.mapRect(&domain, rect);
             domain.inset(i < scaleFactorX ? SK_ScalarHalf / srcTexture->width() : 0.0f,
                          i < scaleFactorY ? SK_ScalarHalf / srcTexture->height() : 0.0f);
             SkAutoTUnref<GrFragmentProcessor> fp(   GrTextureDomainEffect::Create(
                 srcTexture,
                 matrix,
                 domain,
                 GrTextureDomain::kDecal_Mode,
                 GrTextureParams::kBilerp_FilterMode));
             paint.addColorProcessor(fp);
         } else {
             GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
             paint.addColorTextureProcessor(srcTexture, matrix, params);
         }
         scale_rect(&dstRect, i < scaleFactorX ? 0.5f : 1.0f,
                              i < scaleFactorY ? 0.5f : 1.0f);
-        context->drawNonAARectToRect(dstTexture->asRenderTarget(), clip, paint, SkMatrix::I(),
-                                     dstRect, srcRect);
+        drawContext->drawNonAARectToRect(dstTexture->asRenderTarget(), clip, paint, SkMatrix::I(),
+                                         dstRect, srcRect);
         srcRect = dstRect;
         srcTexture = dstTexture;
         SkTSwap(dstTexture, tempTexture);
     }
 
     const SkIRect srcIRect = srcRect.roundOut();
 
     // For really small blurs(Certainly no wider than 5x5 on desktop gpus) it is faster to just
     // launch a single non separable kernel vs two launches
     if (sigmaX > 0.0f && sigmaY > 0 &&
             (2 * radiusX + 1) * (2 * radiusY + 1) <= MAX_KERNEL_SIZE) {
         // We shouldn't be scaling because this is a small size blur
         SkASSERT((scaleFactorX == scaleFactorY) == 1);
         SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
-        convolve_gaussian_2d(context, dstTexture->asRenderTarget(), clip, srcRect, dstRect,
+        convolve_gaussian_2d(drawContext, dstTexture->asRenderTarget(), clip, srcRect, dstRect,
                              srcTexture, radiusX, radiusY, sigmaX, sigmaY, cropToRect, srcIRect);
         srcTexture = dstTexture;
         srcRect = dstRect;
         SkTSwap(dstTexture, tempTexture);
 
     } else {
         if (sigmaX > 0.0f) {
             if (scaleFactorX > 1) {
                 // Clear out a radius to the right of the srcRect to prevent the
                 // X convolution from reading garbage.
                 clearRect = SkIRect::MakeXYWH(srcIRect.fRight, srcIRect.fTop,
                                               radiusX, srcIRect.height());
-                context->clear(&clearRect, 0x0, false, srcTexture->asRenderTarget());
+                drawContext->clear(srcTexture->asRenderTarget(), &clearRect, 0x0, false);
             }
             SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
-            convolve_gaussian(context, dstTexture->asRenderTarget(), clip, srcRect, dstRect,
+            convolve_gaussian(drawContext, dstTexture->asRenderTarget(), clip, srcRect, dstRect,
                               srcTexture, Gr1DKernelEffect::kX_Direction, radiusX, sigmaX,
                               cropToRect);
             srcTexture = dstTexture;
             srcRect = dstRect;
             SkTSwap(dstTexture, tempTexture);
         }
 
         if (sigmaY > 0.0f) {
             if (scaleFactorY > 1 || sigmaX > 0.0f) {
                 // Clear out a radius below the srcRect to prevent the Y
                 // convolution from reading garbage.
                 clearRect = SkIRect::MakeXYWH(srcIRect.fLeft, srcIRect.fBottom,
                                               srcIRect.width(), radiusY);
-                context->clear(&clearRect, 0x0, false, srcTexture->asRenderTarget());
+                drawContext->clear(srcTexture->asRenderTarget(), &clearRect, 0x0, false);
             }
 
             SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
-            convolve_gaussian(context, dstTexture->asRenderTarget(), clip, srcRect,
+            convolve_gaussian(drawContext, dstTexture->asRenderTarget(), clip, srcRect,
                               dstRect, srcTexture, Gr1DKernelEffect::kY_Direction, radiusY, sigmaY,
                               cropToRect);
             srcTexture = dstTexture;
             srcRect = dstRect;
             SkTSwap(dstTexture, tempTexture);
         }
     }
 
     if (scaleFactorX > 1 || scaleFactorY > 1) {
         // Clear one pixel to the right and below, to accommodate bilinear
         // upsampling.
         clearRect = SkIRect::MakeXYWH(srcIRect.fLeft, srcIRect.fBottom,
                                       srcIRect.width() + 1, 1);
-        context->clear(&clearRect, 0x0, false, srcTexture->asRenderTarget());
+        drawContext->clear(srcTexture->asRenderTarget(), &clearRect, 0x0, false);
         clearRect = SkIRect::MakeXYWH(srcIRect.fRight, srcIRect.fTop,
                                       1, srcIRect.height());
-        context->clear(&clearRect, 0x0, false, srcTexture->asRenderTarget());
+        drawContext->clear(srcTexture->asRenderTarget(), &clearRect, 0x0, false);
         SkMatrix matrix;
         matrix.setIDiv(srcTexture->width(), srcTexture->height());
 
         GrPaint paint;
         // FIXME:  this should be mitchell, not bilinear.
         GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
         paint.addColorTextureProcessor(srcTexture, matrix, params);
 
         SkRect dstRect(srcRect);
         scale_rect(&dstRect, (float) scaleFactorX, (float) scaleFactorY);
-        context->drawNonAARectToRect(dstTexture->asRenderTarget(), clip, paint,
-                                     SkMatrix::I(), dstRect, srcRect);
+        drawContext->drawNonAARectToRect(dstTexture->asRenderTarget(), clip, paint,
+                                         SkMatrix::I(), dstRect, srcRect);
         srcRect = dstRect;
         srcTexture = dstTexture;
         SkTSwap(dstTexture, tempTexture);
     }
     return SkRef(srcTexture);
 }
 #endif
 
 }