The Tor Browser: gfx/skia/trunk/src/effects/SkGpuBlurUtils.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/effects/SkGpuBlurUtils.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/effects/SkGpuBlurUtils.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * 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/GrTextureDomain.h"
 #include "GrContext.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);
     rect->fTop    = SkScalarMul(rect->fTop,    yScale);
     rect->fRight  = SkScalarMul(rect->fRight,  xScale);
     rect->fBottom = SkScalarMul(rect->fBottom, yScale);
 }
 static float adjust_sigma(float sigma, int *scaleFactor, int *radius) {
     *scaleFactor = 1;
     while (sigma > MAX_BLUR_SIGMA) {
         *scaleFactor *= 2;
         sigma *= 0.5f;
     }
     *radius = static_cast<int>(ceilf(sigma * 3.0f));
     SkASSERT(*radius <= GrConvolutionEffect::kMaxKernelRadius);
     return sigma;
 }
 static void convolve_gaussian_pass(GrContext* context,
                                    const SkRect& srcRect,
                                    const SkRect& dstRect,
                                    GrTexture* texture,
                                    Gr1DKernelEffect::Direction direction,
                                    int radius,
                                    float sigma,
                                    bool useBounds,
                                    float bounds[2]) {
     GrPaint paint;
     paint.reset();
     SkAutoTUnref<GrEffectRef> conv(GrConvolutionEffect::CreateGaussian(
         texture, direction, radius, sigma, useBounds, bounds));
     paint.reset();
     paint.addColorEffect(conv);
     context->drawRectToRect(paint, dstRect, srcRect);
 }
 static void convolve_gaussian(GrContext* context,
                               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_pass(context, 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();
         bounds[1] = SkScalarToFloat(srcRect.right()) / texture->width();
         size = srcRect.width();
         lowerSrcRect.fRight = srcRect.left() + rad;
         lowerDstRect.fRight = dstRect.left() + rad;
         upperSrcRect.fLeft = srcRect.right() - rad;
         upperDstRect.fLeft = dstRect.right() - rad;
         middleSrcRect.inset(rad, 0);
         middleDstRect.inset(rad, 0);
     } else {
         bounds[0] = SkScalarToFloat(srcRect.top()) / texture->height();
         bounds[1] = SkScalarToFloat(srcRect.bottom()) / texture->height();
         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_pass(context, srcRect, dstRect, texture,
                           direction, radius, sigma, true, bounds);
     } else {
         // Draw upper and lower margins with bounds; middle without.
         convolve_gaussian_pass(context, lowerSrcRect, lowerDstRect, texture,
                           direction, radius, sigma, true, bounds);
         convolve_gaussian_pass(context, upperSrcRect, upperDstRect, texture,
                           direction, radius, sigma, true, bounds);
         convolve_gaussian_pass(context, middleSrcRect, middleDstRect, texture,
                           direction, radius, sigma, false, bounds);
     }
 }
 GrTexture* GaussianBlur(GrContext* context,
                         GrTexture* srcTexture,
                         bool canClobberSrc,
                         const SkRect& rect,
                         bool cropToRect,
                         float sigmaX,
                         float sigmaY) {
     SkASSERT(NULL != context);
     GrContext::AutoRenderTarget art(context);
     GrContext::AutoMatrix am;
     am.setIdentity(context);
     SkIRect clearRect;
     int scaleFactorX, radiusX;
     int scaleFactorY, radiusY;
     sigmaX = adjust_sigma(sigmaX, &scaleFactorX, &radiusX);
     sigmaY = adjust_sigma(sigmaY, &scaleFactorY, &radiusY);
     SkRect srcRect(rect);
     scale_rect(&srcRect, 1.0f / scaleFactorX, 1.0f / scaleFactorY);
     srcRect.roundOut();
     scale_rect(&srcRect, static_cast<float>(scaleFactorX),
                          static_cast<float>(scaleFactorY));
     GrContext::AutoClip acs(context, SkRect::MakeWH(srcRect.width(), srcRect.height()));
     SkASSERT(kBGRA_8888_GrPixelConfig == srcTexture->config() ||
              kRGBA_8888_GrPixelConfig == srcTexture->config() ||
              kAlpha_8_GrPixelConfig == srcTexture->config());
     GrTextureDesc desc;
     desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
     desc.fWidth = SkScalarFloorToInt(srcRect.width());
     desc.fHeight = SkScalarFloorToInt(srcRect.height());
     desc.fConfig = srcTexture->config();
     GrAutoScratchTexture temp1, temp2;
     GrTexture* dstTexture = temp1.set(context, desc);
     GrTexture* tempTexture = canClobberSrc ? srcTexture : temp2.set(context, desc);
     if (NULL == dstTexture || NULL == tempTexture) {
         return NULL;
     }
     for (int i = 1; i < scaleFactorX || i < scaleFactorY; i *= 2) {
         GrPaint paint;
         SkMatrix matrix;
         matrix.setIDiv(srcTexture->width(), srcTexture->height());
         context->setRenderTarget(dstTexture->asRenderTarget());
         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<GrEffectRef> effect(GrTextureDomainEffect::Create(
                 srcTexture,
                 matrix,
                 domain,
                 GrTextureDomain::kDecal_Mode,
                 GrTextureParams::kBilerp_FilterMode));
             paint.addColorEffect(effect);
         } else {
             GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
             paint.addColorTextureEffect(srcTexture, matrix, params);
         }
         scale_rect(&dstRect, i < scaleFactorX ? 0.5f : 1.0f,
                              i < scaleFactorY ? 0.5f : 1.0f);
         context->drawRectToRect(paint, dstRect, srcRect);
         srcRect = dstRect;
         srcTexture = dstTexture;
         SkTSwap(dstTexture, tempTexture);
     }
     SkIRect srcIRect;
     srcRect.roundOut(&srcIRect);
     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);
         }
         context->setRenderTarget(dstTexture->asRenderTarget());
         SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
         convolve_gaussian(context, 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);
         }
         context->setRenderTarget(dstTexture->asRenderTarget());
         SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
         convolve_gaussian(context, 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);
         clearRect = SkIRect::MakeXYWH(srcIRect.fRight, srcIRect.fTop,
 , srcIRect.height());
         context->clear(&clearRect, 0x0, false);
         SkMatrix matrix;
         matrix.setIDiv(srcTexture->width(), srcTexture->height());
         context->setRenderTarget(dstTexture->asRenderTarget());
         GrPaint paint;
         // FIXME:  this should be mitchell, not bilinear.
         GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
         paint.addColorTextureEffect(srcTexture, matrix, params);
         SkRect dstRect(srcRect);
         scale_rect(&dstRect, (float) scaleFactorX, (float) scaleFactorY);
         context->drawRectToRect(paint, dstRect, srcRect);
         srcRect = dstRect;
         srcTexture = dstTexture;
         SkTSwap(dstTexture, tempTexture);
     }
     if (srcTexture == temp1.texture()) {
         return temp1.detach();
     } else if (srcTexture == temp2.texture()) {
         return temp2.detach();
     } else {
         srcTexture->ref();
         return srcTexture;
     }
 }
 #endif
 }

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gfx/skia/trunk/src/effects/SkGpuBlurUtils.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/effects/SkGpuBlurUtils.cpp