/*
* 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,
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);
}
static void convolve_gaussian_2d(GrContext* context,
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);
}
static void convolve_gaussian(GrContext* context,
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,
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, 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,
direction, radius, sigma, true, bounds);
convolve_gaussian_1d(context, rt, clip, upperSrcRect, upperDstRect, texture,
direction, radius, sigma, true, bounds);
convolve_gaussian_1d(context, 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,
float sigmaY) {
SkASSERT(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));
// setup new clip
GrClip clip(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;
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->textureProvider()->refScratchTexture(
desc, GrTextureProvider::kApprox_ScratchTexMatch));
dstTexture = temp1.get();
if (canClobberSrc) {
tempTexture = srcTexture;
} else {
temp2.reset(context->textureProvider()->refScratchTexture(
desc, GrTextureProvider::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());
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);
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,
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());
}
SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
convolve_gaussian(context, 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());
}
SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
convolve_gaussian(context, 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());
clearRect = SkIRect::MakeXYWH(srcIRect.fRight, srcIRect.fTop,
1, srcIRect.height());
context->clear(&clearRect, 0x0, false, srcTexture->asRenderTarget());
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);
srcRect = dstRect;
srcTexture = dstTexture;
SkTSwap(dstTexture, tempTexture);
}
return SkRef(srcTexture);
}
#endif
}