| /* |
| * 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" |
| #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 maxTextureSize, int *scaleFactor, int *radius) { |
| *scaleFactor = 1; |
| while (sigma > MAX_BLUR_SIGMA) { |
| *scaleFactor *= 2; |
| sigma *= 0.5f; |
| 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, |
| 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<GrFragmentProcessor> conv(GrConvolutionEffect::CreateGaussian( |
| texture, direction, radius, sigma, useBounds, bounds)); |
| paint.reset(); |
| paint.addColorProcessor(conv); |
| context->drawRectToRect(paint, dstRect, srcRect); |
| } |
| |
| static void convolve_gaussian_2d(GrContext* context, |
| 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; |
| paint.reset(); |
| SkAutoTUnref<GrFragmentProcessor> conv(GrMatrixConvolutionEffect::CreateGaussian( |
| texture, bounds, size, 1.0, 0.0, kernelOffset, |
| useBounds ? GrTextureDomain::kClamp_Mode : GrTextureDomain::kIgnore_Mode, |
| true, sigmaX, sigmaY)); |
| paint.reset(); |
| paint.addColorProcessor(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_1d(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_1d(context, srcRect, dstRect, texture, |
| direction, radius, sigma, true, bounds); |
| } else { |
| // Draw upper and lower margins with bounds; middle without. |
| convolve_gaussian_1d(context, lowerSrcRect, lowerDstRect, texture, |
| direction, radius, sigma, true, bounds); |
| convolve_gaussian_1d(context, upperSrcRect, upperDstRect, texture, |
| direction, radius, sigma, true, bounds); |
| convolve_gaussian_1d(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(context); |
| |
| GrContext::AutoRenderTarget art(context); |
| |
| GrContext::AutoMatrix am; |
| am.setIdentity(context); |
| |
| SkIRect clearRect; |
| int scaleFactorX, radiusX; |
| int scaleFactorY, radiusY; |
| int maxTextureSize = context->getMaxTextureSize(); |
| sigmaX = adjust_sigma(sigmaX, maxTextureSize, &scaleFactorX, &radiusX); |
| sigmaY = adjust_sigma(sigmaY, maxTextureSize, &scaleFactorY, &radiusY); |
| |
| SkRect srcRect(rect); |
| scale_rect(&srcRect, 1.0f / scaleFactorX, 1.0f / scaleFactorY); |
| srcRect.roundOut(&srcRect); |
| 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()); |
| |
| GrSurfaceDesc desc; |
| desc.fFlags = kRenderTarget_GrSurfaceFlag | kNoStencil_GrSurfaceFlag; |
| desc.fWidth = SkScalarFloorToInt(srcRect.width()); |
| desc.fHeight = SkScalarFloorToInt(srcRect.height()); |
| desc.fConfig = srcTexture->config(); |
| |
| GrTexture* dstTexture; |
| GrTexture* tempTexture; |
| SkAutoTUnref<GrTexture> temp1, temp2; |
| |
| temp1.reset(context->refScratchTexture(desc, GrContext::kApprox_ScratchTexMatch)); |
| dstTexture = temp1.get(); |
| if (canClobberSrc) { |
| tempTexture = srcTexture; |
| } else { |
| temp2.reset(context->refScratchTexture(desc, GrContext::kApprox_ScratchTexMatch)); |
| tempTexture = temp2.get(); |
| } |
| |
| 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<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->drawRectToRect(paint, 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); |
| context->setRenderTarget(dstTexture->asRenderTarget()); |
| SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height()); |
| convolve_gaussian_2d(context, 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, context->getRenderTarget()); |
| } |
| 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->getRenderTarget()); |
| } |
| |
| 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, context->getRenderTarget()); |
| clearRect = SkIRect::MakeXYWH(srcIRect.fRight, srcIRect.fTop, |
| 1, srcIRect.height()); |
| context->clear(&clearRect, 0x0, false, context->getRenderTarget()); |
| 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.addColorTextureProcessor(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); |
| } |
| return SkRef(srcTexture); |
| } |
| #endif |
| |
| } |