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add support for high quality image filtering on the GPU

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R=bsalomon@google.com, reed@google.com

Review URL: https://codereview.chromium.org/23779003

git-svn-id: http://skia.googlecode.com/svn/trunk@11087 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
humper@google.com 2013-09-04 19:23:53 +00:00
parent f0595b39a9
commit 3aad3b01af
9 changed files with 562 additions and 199 deletions
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282
gm/tilemodes_scaled.cpp Normal file
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@ -0,0 +1,282 @@
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkPath.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkTypeface.h"
// effects
#include "SkGradientShader.h"
#include "SkUnitMappers.h"
#include "SkBlurDrawLooper.h"
static void makebm(SkBitmap* bm, SkBitmap::Config config, int w, int h) {
bm->setConfig(config, w, h);
bm->allocPixels();
bm->eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(*bm);
SkPoint pts[] = { { 0, 0 }, { SkIntToScalar(w), SkIntToScalar(h)} };
SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
SkScalar pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
SkPaint paint;
SkUnitMapper* um = NULL;
um = new SkCosineMapper;
// um = new SkDiscreteMapper(12);
SkAutoUnref au(um);
paint.setDither(true);
paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos,
SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, um))->unref();
canvas.drawPaint(paint);
}
static void setup(SkPaint* paint, const SkBitmap& bm, SkPaint::FilterLevel filter_level,
SkShader::TileMode tmx, SkShader::TileMode tmy) {
SkShader* shader = SkShader::CreateBitmapShader(bm, tmx, tmy);
paint->setShader(shader)->unref();
paint->setFilterLevel(filter_level);
}
static const SkBitmap::Config gConfigs[] = {
SkBitmap::kARGB_8888_Config,
SkBitmap::kRGB_565_Config,
};
class ScaledTilingGM : public skiagm::GM {
SkBlurDrawLooper fLooper;
public:
ScaledTilingGM(bool powerOfTwoSize)
: fLooper(SkIntToScalar(1), SkIntToScalar(2), SkIntToScalar(2), 0x88000000)
, fPowerOfTwoSize(powerOfTwoSize) {
}
SkBitmap fTexture[SK_ARRAY_COUNT(gConfigs)];
protected:
enum {
kPOTSize = 4,
kNPOTSize = 3,
};
SkString onShortName() {
SkString name("scaled_tilemodes");
if (!fPowerOfTwoSize) {
name.append("_npot");
}
return name;
}
SkISize onISize() { return SkISize::Make(880, 760); }
virtual void onOnceBeforeDraw() SK_OVERRIDE {
int size = fPowerOfTwoSize ? kPOTSize : kNPOTSize;
for (size_t i = 0; i < SK_ARRAY_COUNT(gConfigs); i++) {
makebm(&fTexture[i], gConfigs[i], size, size);
}
}
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
float scale = 32.f/kPOTSize;
int size = fPowerOfTwoSize ? kPOTSize : kNPOTSize;
SkRect r = { 0, 0, SkIntToScalar(size*2), SkIntToScalar(size*2) };
static const char* gConfigNames[] = { "8888" , "565", "4444" };
static const SkPaint::FilterLevel gFilterLevels[] =
{ SkPaint::kNone_FilterLevel,
SkPaint::kLow_FilterLevel,
SkPaint::kMedium_FilterLevel,
SkPaint::kHigh_FilterLevel };
static const char* gFilterNames[] = { "None", "Low", "Medium", "High" };
static const SkShader::TileMode gModes[] = { SkShader::kClamp_TileMode, SkShader::kRepeat_TileMode, SkShader::kMirror_TileMode };
static const char* gModeNames[] = { "C", "R", "M" };
SkScalar y = SkIntToScalar(24);
SkScalar x = SkIntToScalar(10)/scale;
for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
SkPaint p;
SkString str;
p.setAntiAlias(true);
p.setDither(true);
p.setLooper(&fLooper);
str.printf("[%s,%s]", gModeNames[kx], gModeNames[ky]);
p.setTextAlign(SkPaint::kCenter_Align);
canvas->drawText(str.c_str(), str.size(), scale*(x + r.width()/2), y, p);
x += r.width() * 4 / 3;
}
}
y = SkIntToScalar(40) / scale;
for (size_t i = 0; i < SK_ARRAY_COUNT(gConfigs); i++) {
for (size_t j = 0; j < SK_ARRAY_COUNT(gFilterLevels); j++) {
x = SkIntToScalar(10)/scale;
for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
SkPaint paint;
#if 1 // Temporary change to regen bitmap before each draw. This may help tracking down an issue
// on SGX where resizing NPOT textures to POT textures exhibits a driver bug.
if (!fPowerOfTwoSize) {
makebm(&fTexture[i], gConfigs[i], size, size);
}
#endif
setup(&paint, fTexture[i], gFilterLevels[j], gModes[kx], gModes[ky]);
paint.setDither(true);
canvas->save();
canvas->scale(scale,scale);
canvas->translate(x, y);
canvas->drawRect(r, paint);
canvas->restore();
x += r.width() * 4 / 3;
}
}
{
SkPaint p;
SkString str;
p.setAntiAlias(true);
p.setLooper(&fLooper);
str.printf("%s, %s", gConfigNames[i], gFilterNames[j]);
canvas->drawText(str.c_str(), str.size(), scale*x, scale*(y + r.height() * 2 / 3), p);
}
y += r.height() * 4 / 3;
}
}
}
private:
bool fPowerOfTwoSize;
typedef skiagm::GM INHERITED;
};
static const int gWidth = 32;
static const int gHeight = 32;
static SkShader* make_bm(SkShader::TileMode tx, SkShader::TileMode ty) {
SkBitmap bm;
makebm(&bm, SkBitmap::kARGB_8888_Config, gWidth, gHeight);
return SkShader::CreateBitmapShader(bm, tx, ty);
}
static SkShader* make_grad(SkShader::TileMode tx, SkShader::TileMode ty) {
SkPoint pts[] = { { 0, 0 }, { SkIntToScalar(gWidth), SkIntToScalar(gHeight)} };
SkPoint center = { SkIntToScalar(gWidth)/2, SkIntToScalar(gHeight)/2 };
SkScalar rad = SkIntToScalar(gWidth)/2;
SkColor colors[] = { 0xFFFF0000, 0xFF0044FF };
int index = (int)ty;
switch (index % 3) {
case 0:
return SkGradientShader::CreateLinear(pts, colors, NULL, SK_ARRAY_COUNT(colors), tx);
case 1:
return SkGradientShader::CreateRadial(center, rad, colors, NULL, SK_ARRAY_COUNT(colors), tx);
case 2:
return SkGradientShader::CreateSweep(center.fX, center.fY, colors, NULL, SK_ARRAY_COUNT(colors));
}
return NULL;
}
typedef SkShader* (*ShaderProc)(SkShader::TileMode, SkShader::TileMode);
class ScaledTiling2GM : public skiagm::GM {
ShaderProc fProc;
SkString fName;
public:
ScaledTiling2GM(ShaderProc proc, const char name[]) : fProc(proc) {
fName.printf("scaled_tilemode_%s", name);
}
protected:
SkString onShortName() {
return fName;
}
SkISize onISize() { return SkISize::Make(880, 560); }
virtual void onDraw(SkCanvas* canvas) {
canvas->scale(SkIntToScalar(3)/2, SkIntToScalar(3)/2);
const SkScalar w = SkIntToScalar(gWidth);
const SkScalar h = SkIntToScalar(gHeight);
SkRect r = { -w, -h, w*2, h*2 };
static const SkShader::TileMode gModes[] = {
SkShader::kClamp_TileMode, SkShader::kRepeat_TileMode, SkShader::kMirror_TileMode
};
static const char* gModeNames[] = {
"Clamp", "Repeat", "Mirror"
};
SkScalar y = SkIntToScalar(24);
SkScalar x = SkIntToScalar(66);
SkPaint p;
p.setAntiAlias(true);
p.setTextAlign(SkPaint::kCenter_Align);
for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
SkString str(gModeNames[kx]);
canvas->drawText(str.c_str(), str.size(), x + r.width()/2, y, p);
x += r.width() * 4 / 3;
}
y += SkIntToScalar(16) + h;
p.setTextAlign(SkPaint::kRight_Align);
for (size_t ky = 0; ky < SK_ARRAY_COUNT(gModes); ky++) {
x = SkIntToScalar(16) + w;
SkString str(gModeNames[ky]);
canvas->drawText(str.c_str(), str.size(), x, y + h/2, p);
x += SkIntToScalar(50);
for (size_t kx = 0; kx < SK_ARRAY_COUNT(gModes); kx++) {
SkPaint paint;
paint.setShader(fProc(gModes[kx], gModes[ky]))->unref();
canvas->save();
canvas->translate(x, y);
canvas->drawRect(r, paint);
canvas->restore();
x += r.width() * 4 / 3;
}
y += r.height() * 4 / 3;
}
}
private:
typedef skiagm::GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new ScaledTilingGM(true); )
DEF_GM( return new ScaledTilingGM(false); )
DEF_GM( return new ScaledTiling2GM(make_bm, "bitmap"); )
DEF_GM( return new ScaledTiling2GM(make_grad, "gradient"); )

1
gyp/effects.gyp
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@ -16,6 +16,7 @@
],
'include_dirs': [
'../include/effects',
'../src/effects',
'../src/core',
],
'direct_dependent_settings': {

1
gyp/gmslides.gypi
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@ -122,6 +122,7 @@
'../gm/thinrects.cpp',
'../gm/thinstrokedrects.cpp',
'../gm/tilemodes.cpp',
'../gm/tilemodes_scaled.cpp',
'../gm/tinybitmap.cpp',
'../gm/twopointradial.cpp',
'../gm/typeface.cpp',

2
gyp/gpu.gypi
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@ -134,6 +134,8 @@
'<(skia_src_path)/gpu/effects/GrBezierEffect.h',
'<(skia_src_path)/gpu/effects/GrConvolutionEffect.cpp',
'<(skia_src_path)/gpu/effects/GrConvolutionEffect.h',
'<(skia_src_path)/gpu/effects/GrBicubicEffect.cpp',
'<(skia_src_path)/gpu/effects/GrBicubicEffect.h',
'<(skia_src_path)/gpu/effects/GrSimpleTextureEffect.cpp',
'<(skia_src_path)/gpu/effects/GrSimpleTextureEffect.h',
'<(skia_src_path)/gpu/effects/GrSingleTextureEffect.cpp',

7
include/core/SkError.h
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@ -47,7 +47,12 @@ enum SkError {
/** Skia failed while trying to consume some external resource.
*/
kParseError_SkError
kParseError_SkError,
/** Something went wrong internally; could be resource exhaustion but
* will often be a bug.
*/
kInternalError_SkError
};
/** Return the current per-thread error code. Error codes are "sticky"; they

23
src/core/SkBitmapProcShader.cpp
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@ -5,11 +5,14 @@
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBitmapProcShader.h"
#include "SkColorPriv.h"
#include "SkFlattenableBuffers.h"
#include "SkPixelRef.h"
#include "SkErrorInternals.h"
#include "SkBitmapProcShader.h"
#include "effects/GrSimpleTextureEffect.h"
#include "effects/GrBicubicEffect.h"
bool SkBitmapProcShader::CanDo(const SkBitmap& bm, TileMode tx, TileMode ty) {
switch (bm.config()) {
@ -367,11 +370,9 @@ GrEffectRef* SkBitmapProcShader::asNewEffect(GrContext* context, const SkPaint&
textureFilterMode = GrTextureParams::kMipMap_FilterMode;
break;
case SkPaint::kHigh_FilterLevel:
SkErrorInternals::SetError( kInvalidPaint_SkError,
"Sorry, I don't yet support high quality "
"filtering on the GPU; falling back to "
"MIPMaps.");
textureFilterMode = GrTextureParams::kMipMap_FilterMode;
// fall back to no filtering here; we will install another
// shader that will do the HQ filtering.
textureFilterMode = GrTextureParams::kNone_FilterMode;
break;
default:
SkErrorInternals::SetError( kInvalidPaint_SkError,
@ -386,11 +387,17 @@ GrEffectRef* SkBitmapProcShader::asNewEffect(GrContext* context, const SkPaint&
GrTexture* texture = GrLockAndRefCachedBitmapTexture(context, fRawBitmap, &params);
if (NULL == texture) {
SkDebugf("Couldn't convert bitmap to texture.\n");
SkErrorInternals::SetError( kInternalError_SkError,
"Couldn't convert bitmap to texture.");
return NULL;
}
GrEffectRef* effect = GrSimpleTextureEffect::Create(texture, matrix, params);
GrEffectRef* effect = NULL;
if (paintFilterLevel == SkPaint::kHigh_FilterLevel) {
effect = GrBicubicEffect::Create(texture, matrix, params);
} else {
effect = GrSimpleTextureEffect::Create(texture, matrix, params);
}
GrUnlockAndUnrefCachedBitmapTexture(texture);
return effect;
}

201
src/effects/SkBicubicImageFilter.cpp
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@ -14,31 +14,30 @@
#include "SkUnPreMultiply.h"
#if SK_SUPPORT_GPU
#include "gl/GrGLEffectMatrix.h"
#include "effects/GrSingleTextureEffect.h"
#include "GrTBackendEffectFactory.h"
#include "effects/GrBicubicEffect.h"
#include "GrContext.h"
#include "GrTexture.h"
#include "SkImageFilterUtils.h"
#endif
#define DS(x) SkDoubleToScalar(x)
static const SkScalar gMitchellCoefficients[16] = {
DS( 1.0 / 18.0), DS(-9.0 / 18.0), DS( 15.0 / 18.0), DS( -7.0 / 18.0),
DS(16.0 / 18.0), DS( 0.0 / 18.0), DS(-36.0 / 18.0), DS( 21.0 / 18.0),
DS( 1.0 / 18.0), DS( 9.0 / 18.0), DS( 27.0 / 18.0), DS(-21.0 / 18.0),
DS( 0.0 / 18.0), DS( 0.0 / 18.0), DS( -6.0 / 18.0), DS( 7.0 / 18.0),
};
SkBicubicImageFilter::SkBicubicImageFilter(const SkSize& scale, const SkScalar coefficients[16], SkImageFilter* input)
: INHERITED(input),
fScale(scale) {
memcpy(fCoefficients, coefficients, sizeof(fCoefficients));
}
#define DS(x) SkDoubleToScalar(x)
SkBicubicImageFilter* SkBicubicImageFilter::CreateMitchell(const SkSize& scale,
SkImageFilter* input) {
static const SkScalar coefficients[16] = {
DS( 1.0 / 18.0), DS(-9.0 / 18.0), DS( 15.0 / 18.0), DS( -7.0 / 18.0),
DS(16.0 / 18.0), DS( 0.0 / 18.0), DS(-36.0 / 18.0), DS( 21.0 / 18.0),
DS( 1.0 / 18.0), DS( 9.0 / 18.0), DS( 27.0 / 18.0), DS(-21.0 / 18.0),
DS( 0.0 / 18.0), DS( 0.0 / 18.0), DS( -6.0 / 18.0), DS( 7.0 / 18.0),
};
return SkNEW_ARGS(SkBicubicImageFilter, (scale, coefficients, input));
return SkNEW_ARGS(SkBicubicImageFilter, (scale, gMitchellCoefficients, input));
}
SkBicubicImageFilter::SkBicubicImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
@ -157,184 +156,6 @@ bool SkBicubicImageFilter::onFilterImage(Proxy* proxy,
///////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
class GrGLBicubicEffect;
class GrBicubicEffect : public GrSingleTextureEffect {
public:
virtual ~GrBicubicEffect();
static const char* Name() { return "Bicubic"; }
const float* coefficients() const { return fCoefficients; }
typedef GrGLBicubicEffect GLEffect;
virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16]) {
AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients)));
return CreateEffectRef(effect);
}
private:
GrBicubicEffect(GrTexture*, const SkScalar coefficients[16]);
virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
float fCoefficients[16];
GR_DECLARE_EFFECT_TEST;
typedef GrSingleTextureEffect INHERITED;
};
class GrGLBicubicEffect : public GrGLEffect {
public:
GrGLBicubicEffect(const GrBackendEffectFactory& factory,
const GrDrawEffect&);
virtual void emitCode(GrGLShaderBuilder*,
const GrDrawEffect&,
EffectKey,
const char* outputColor,
const char* inputColor,
const TextureSamplerArray&) SK_OVERRIDE;
static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE;
private:
typedef GrGLUniformManager::UniformHandle UniformHandle;
UniformHandle fCoefficientsUni;
UniformHandle fImageIncrementUni;
GrGLEffectMatrix fEffectMatrix;
typedef GrGLEffect INHERITED;
};
GrGLBicubicEffect::GrGLBicubicEffect(const GrBackendEffectFactory& factory,
const GrDrawEffect& drawEffect)
: INHERITED(factory)
, fEffectMatrix(drawEffect.castEffect<GrBicubicEffect>().coordsType()) {
}
void GrGLBicubicEffect::emitCode(GrGLShaderBuilder* builder,
const GrDrawEffect&,
EffectKey key,
const char* outputColor,
const char* inputColor,
const TextureSamplerArray& samplers) {
SkString coords;
fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, &coords);
fCoefficientsUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
kMat44f_GrSLType, "Coefficients");
fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
kVec2f_GrSLType, "ImageIncrement");
const char* imgInc = builder->getUniformCStr(fImageIncrementUni);
const char* coeff = builder->getUniformCStr(fCoefficientsUni);
SkString cubicBlendName;
static const GrGLShaderVar gCubicBlendArgs[] = {
GrGLShaderVar("coefficients", kMat44f_GrSLType),
GrGLShaderVar("t", kFloat_GrSLType),
GrGLShaderVar("c0", kVec4f_GrSLType),
GrGLShaderVar("c1", kVec4f_GrSLType),
GrGLShaderVar("c2", kVec4f_GrSLType),
GrGLShaderVar("c3", kVec4f_GrSLType),
};
builder->fsEmitFunction(kVec4f_GrSLType,
"cubicBlend",
SK_ARRAY_COUNT(gCubicBlendArgs),
gCubicBlendArgs,
"\tvec4 ts = vec4(1.0, t, t * t, t * t * t);\n"
"\tvec4 c = coefficients * ts;\n"
"\treturn c.x * c0 + c.y * c1 + c.z * c2 + c.w * c3;\n",
&cubicBlendName);
builder->fsCodeAppendf("\tvec2 coord = %s - %s * vec2(0.5, 0.5);\n", coords.c_str(), imgInc);
builder->fsCodeAppendf("\tvec2 f = fract(coord / %s);\n", imgInc);
for (int y = 0; y < 4; ++y) {
for (int x = 0; x < 4; ++x) {
SkString coord;
coord.printf("coord + %s * vec2(%d, %d)", imgInc, x - 1, y - 1);
builder->fsCodeAppendf("\tvec4 s%d%d = ", x, y);
builder->fsAppendTextureLookup(samplers[0], coord.c_str());
builder->fsCodeAppend(";\n");
}
builder->fsCodeAppendf("\tvec4 s%d = %s(%s, f.x, s0%d, s1%d, s2%d, s3%d);\n", y, cubicBlendName.c_str(), coeff, y, y, y, y);
}
builder->fsCodeAppendf("\t%s = %s(%s, f.y, s0, s1, s2, s3);\n", outputColor, cubicBlendName.c_str(), coeff);
}
GrGLEffect::EffectKey GrGLBicubicEffect::GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
const GrBicubicEffect& bicubic = drawEffect.castEffect<GrBicubicEffect>();
EffectKey matrixKey = GrGLEffectMatrix::GenKey(bicubic.getMatrix(),
drawEffect,
bicubic.coordsType(),
bicubic.texture(0));
return matrixKey;
}
void GrGLBicubicEffect::setData(const GrGLUniformManager& uman,
const GrDrawEffect& drawEffect) {
const GrBicubicEffect& effect = drawEffect.castEffect<GrBicubicEffect>();
GrTexture& texture = *effect.texture(0);
float imageIncrement[2];
imageIncrement[0] = 1.0f / texture.width();
imageIncrement[1] = 1.0f / texture.height();
uman.set2fv(fImageIncrementUni, 0, 1, imageIncrement);
uman.setMatrix4f(fCoefficientsUni, effect.coefficients());
fEffectMatrix.setData(uman,
effect.getMatrix(),
drawEffect,
effect.texture(0));
}
GrBicubicEffect::GrBicubicEffect(GrTexture* texture,
const SkScalar coefficients[16])
: INHERITED(texture, MakeDivByTextureWHMatrix(texture)) {
for (int y = 0; y < 4; y++) {
for (int x = 0; x < 4; x++) {
// Convert from row-major scalars to column-major floats.
fCoefficients[x * 4 + y] = SkScalarToFloat(coefficients[y * 4 + x]);
}
}
}
GrBicubicEffect::~GrBicubicEffect() {
}
const GrBackendEffectFactory& GrBicubicEffect::getFactory() const {
return GrTBackendEffectFactory<GrBicubicEffect>::getInstance();
}
bool GrBicubicEffect::onIsEqual(const GrEffect& sBase) const {
const GrBicubicEffect& s = CastEffect<GrBicubicEffect>(sBase);
return this->texture(0) == s.texture(0) &&
!memcmp(fCoefficients, s.coefficients(), 16);
}
void GrBicubicEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
// FIXME: Perhaps we can do better.
*validFlags = 0;
return;
}
GR_DEFINE_EFFECT_TEST(GrBicubicEffect);
GrEffectRef* GrBicubicEffect::TestCreate(SkMWCRandom* random,
GrContext* context,
const GrDrawTargetCaps&,
GrTexture* textures[]) {
int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx :
GrEffectUnitTest::kAlphaTextureIdx;
SkScalar coefficients[16];
for (int i = 0; i < 16; i++) {
coefficients[i] = random->nextSScalar1();
}
return GrBicubicEffect::Create(textures[texIdx], coefficients);
}
bool SkBicubicImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm,
SkBitmap* result, SkIPoint* offset) {

175
src/gpu/effects/GrBicubicEffect.cpp Normal file
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@ -0,0 +1,175 @@
#include "GrBicubicEffect.h"
#define DS(x) SkDoubleToScalar(x)
const SkScalar GrBicubicEffect::gMitchellCoefficients[16] = {
DS( 1.0 / 18.0), DS(-9.0 / 18.0), DS( 15.0 / 18.0), DS( -7.0 / 18.0),
DS(16.0 / 18.0), DS( 0.0 / 18.0), DS(-36.0 / 18.0), DS( 21.0 / 18.0),
DS( 1.0 / 18.0), DS( 9.0 / 18.0), DS( 27.0 / 18.0), DS(-21.0 / 18.0),
DS( 0.0 / 18.0), DS( 0.0 / 18.0), DS( -6.0 / 18.0), DS( 7.0 / 18.0),
};
class GrGLBicubicEffect : public GrGLEffect {
public:
GrGLBicubicEffect(const GrBackendEffectFactory& factory,
const GrDrawEffect&);
virtual void emitCode(GrGLShaderBuilder*,
const GrDrawEffect&,
EffectKey,
const char* outputColor,
const char* inputColor,
const TextureSamplerArray&) SK_OVERRIDE;
static inline EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&);
virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE;
private:
typedef GrGLUniformManager::UniformHandle UniformHandle;
UniformHandle fCoefficientsUni;
UniformHandle fImageIncrementUni;
GrGLEffectMatrix fEffectMatrix;
typedef GrGLEffect INHERITED;
};
GrGLBicubicEffect::GrGLBicubicEffect(const GrBackendEffectFactory& factory,
const GrDrawEffect& drawEffect)
: INHERITED(factory)
, fEffectMatrix(drawEffect.castEffect<GrBicubicEffect>().coordsType()) {
}
void GrGLBicubicEffect::emitCode(GrGLShaderBuilder* builder,
const GrDrawEffect&,
EffectKey key,
const char* outputColor,
const char* inputColor,
const TextureSamplerArray& samplers) {
SkString coords;
fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, &coords);
fCoefficientsUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
kMat44f_GrSLType, "Coefficients");
fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_Visibility,
kVec2f_GrSLType, "ImageIncrement");
const char* imgInc = builder->getUniformCStr(fImageIncrementUni);
const char* coeff = builder->getUniformCStr(fCoefficientsUni);
SkString cubicBlendName;
static const GrGLShaderVar gCubicBlendArgs[] = {
GrGLShaderVar("coefficients", kMat44f_GrSLType),
GrGLShaderVar("t", kFloat_GrSLType),
GrGLShaderVar("c0", kVec4f_GrSLType),
GrGLShaderVar("c1", kVec4f_GrSLType),
GrGLShaderVar("c2", kVec4f_GrSLType),
GrGLShaderVar("c3", kVec4f_GrSLType),
};
builder->fsEmitFunction(kVec4f_GrSLType,
"cubicBlend",
SK_ARRAY_COUNT(gCubicBlendArgs),
gCubicBlendArgs,
"\tvec4 ts = vec4(1.0, t, t * t, t * t * t);\n"
"\tvec4 c = coefficients * ts;\n"
"\treturn c.x * c0 + c.y * c1 + c.z * c2 + c.w * c3;\n",
&cubicBlendName);
builder->fsCodeAppendf("\tvec2 coord = %s - %s * vec2(0.5, 0.5);\n", coords.c_str(), imgInc);
builder->fsCodeAppendf("\tvec2 f = fract(coord / %s);\n", imgInc);
for (int y = 0; y < 4; ++y) {
for (int x = 0; x < 4; ++x) {
SkString coord;
coord.printf("coord + %s * vec2(%d, %d)", imgInc, x - 1, y - 1);
builder->fsCodeAppendf("\tvec4 s%d%d = ", x, y);
builder->fsAppendTextureLookup(samplers[0], coord.c_str());
builder->fsCodeAppend(";\n");
}
builder->fsCodeAppendf("\tvec4 s%d = %s(%s, f.x, s0%d, s1%d, s2%d, s3%d);\n", y, cubicBlendName.c_str(), coeff, y, y, y, y);
}
builder->fsCodeAppendf("\t%s = %s(%s, f.y, s0, s1, s2, s3);\n", outputColor, cubicBlendName.c_str(), coeff);
}
GrGLEffect::EffectKey GrGLBicubicEffect::GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
const GrBicubicEffect& bicubic = drawEffect.castEffect<GrBicubicEffect>();
EffectKey matrixKey = GrGLEffectMatrix::GenKey(bicubic.getMatrix(),
drawEffect,
bicubic.coordsType(),
bicubic.texture(0));
return matrixKey;
}
void GrGLBicubicEffect::setData(const GrGLUniformManager& uman,
const GrDrawEffect& drawEffect) {
const GrBicubicEffect& effect = drawEffect.castEffect<GrBicubicEffect>();
GrTexture& texture = *effect.texture(0);
float imageIncrement[2];
imageIncrement[0] = 1.0f / texture.width();
imageIncrement[1] = 1.0f / texture.height();
uman.set2fv(fImageIncrementUni, 0, 1, imageIncrement);
uman.setMatrix4f(fCoefficientsUni, effect.coefficients());
fEffectMatrix.setData(uman,
effect.getMatrix(),
drawEffect,
effect.texture(0));
}
GrBicubicEffect::GrBicubicEffect(GrTexture* texture,
const SkScalar coefficients[16])
: INHERITED(texture, MakeDivByTextureWHMatrix(texture)) {
for (int y = 0; y < 4; y++) {
for (int x = 0; x < 4; x++) {
// Convert from row-major scalars to column-major floats.
fCoefficients[x * 4 + y] = SkScalarToFloat(coefficients[y * 4 + x]);
}
}
}
GrBicubicEffect::GrBicubicEffect(GrTexture* texture,
const SkScalar coefficients[16],
const SkMatrix &matrix,
const GrTextureParams &params,
CoordsType coordsType)
: INHERITED(texture, MakeDivByTextureWHMatrix(texture), params, coordsType) {
for (int y = 0; y < 4; y++) {
for (int x = 0; x < 4; x++) {
// Convert from row-major scalars to column-major floats.
fCoefficients[x * 4 + y] = SkScalarToFloat(coefficients[y * 4 + x]);
}
}
}
GrBicubicEffect::~GrBicubicEffect() {
}
const GrBackendEffectFactory& GrBicubicEffect::getFactory() const {
return GrTBackendEffectFactory<GrBicubicEffect>::getInstance();
}
bool GrBicubicEffect::onIsEqual(const GrEffect& sBase) const {
const GrBicubicEffect& s = CastEffect<GrBicubicEffect>(sBase);
return this->texture(0) == s.texture(0) &&
!memcmp(fCoefficients, s.coefficients(), 16);
}
void GrBicubicEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
// FIXME: Perhaps we can do better.
*validFlags = 0;
return;
}
GR_DEFINE_EFFECT_TEST(GrBicubicEffect);
GrEffectRef* GrBicubicEffect::TestCreate(SkMWCRandom* random,
GrContext* context,
const GrDrawTargetCaps&,
GrTexture* textures[]) {
int texIdx = random->nextBool() ? GrEffectUnitTest::kSkiaPMTextureIdx :
GrEffectUnitTest::kAlphaTextureIdx;
SkScalar coefficients[16];
for (int i = 0; i < 16; i++) {
coefficients[i] = random->nextSScalar1();
}
return GrBicubicEffect::Create(textures[texIdx], coefficients);
}

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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrBicubicTextureEffect_DEFINED
#define GrBicubicTextureEffect_DEFINED
#include "GrSingleTextureEffect.h"
#include "GrDrawEffect.h"
#include "gl/GrGLEffect.h"
#include "gl/GrGLEffectMatrix.h"
#include "GrTBackendEffectFactory.h"
class GrGLBicubicEffect;
class GrBicubicEffect : public GrSingleTextureEffect {
public:
virtual ~GrBicubicEffect();
static const char* Name() { return "Bicubic"; }
const float* coefficients() const { return fCoefficients; }
typedef GrGLBicubicEffect GLEffect;
virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16]) {
AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients)));
return CreateEffectRef(effect);
}
static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16],
const SkMatrix& matrix,
const GrTextureParams& p,
CoordsType coordsType = kLocal_CoordsType) {
AutoEffectUnref effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients, matrix, p, coordsType)));
return CreateEffectRef(effect);
}
static GrEffectRef* Create(GrTexture* tex) {
return Create(tex, gMitchellCoefficients);
}
static GrEffectRef* Create(GrTexture* tex,
const SkMatrix& matrix,
const GrTextureParams& p,
CoordsType coordsType = kLocal_CoordsType) {
return Create(tex, gMitchellCoefficients, matrix, p, coordsType);
}
private:
GrBicubicEffect(GrTexture*, const SkScalar coefficients[16]);
GrBicubicEffect(GrTexture*, const SkScalar coefficients[16],
const SkMatrix &matrix, const GrTextureParams &p, CoordsType coordsType);
virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
float fCoefficients[16];
GR_DECLARE_EFFECT_TEST;
static const SkScalar gMitchellCoefficients[16];
typedef GrSingleTextureEffect INHERITED;
};
#endif