--- /dev/null
+/*
+ * Copyright 2013 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkBicubicImageFilter.h"
+#include "SkBitmap.h"
+#include "SkColorPriv.h"
+#include "SkFlattenableBuffers.h"
+#include "SkRect.h"
+#include "SkUnPreMultiply.h"
+
+#if SK_SUPPORT_GPU
+#include "gl/GrGLEffectMatrix.h"
+#include "effects/GrSingleTextureEffect.h"
+#include "GrTBackendEffectFactory.h"
+#include "GrContext.h"
+#include "GrTexture.h"
+#endif
+
+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));
+}
+
+SkBicubicImageFilter::SkBicubicImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
+ uint32_t readSize = buffer.readScalarArray(fCoefficients);
+ SkASSERT(readSize == 16);
+ fScale.fWidth = buffer.readScalar();
+ fScale.fHeight = buffer.readScalar();
+}
+
+void SkBicubicImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
+ this->INHERITED::flatten(buffer);
+ buffer.writeScalarArray(fCoefficients, 16);
+ buffer.writeScalar(fScale.fWidth);
+ buffer.writeScalar(fScale.fHeight);
+}
+
+SkBicubicImageFilter::~SkBicubicImageFilter() {
+}
+
+inline SkPMColor cubicBlend(const SkScalar c[16], SkScalar t, SkPMColor c0, SkPMColor c1, SkPMColor c2, SkPMColor c3) {
+ SkScalar t2 = t * t, t3 = t2 * t;
+ SkScalar cc[4];
+ // FIXME: For the fractx case, this should be refactored out of this function.
+ cc[0] = c[0] + SkScalarMul(c[1], t) + SkScalarMul(c[2], t2) + SkScalarMul(c[3], t3);
+ cc[1] = c[4] + SkScalarMul(c[5], t) + SkScalarMul(c[6], t2) + SkScalarMul(c[7], t3);
+ cc[2] = c[8] + SkScalarMul(c[9], t) + SkScalarMul(c[10], t2) + SkScalarMul(c[11], t3);
+ cc[3] = c[12] + SkScalarMul(c[13], t) + SkScalarMul(c[14], t2) + SkScalarMul(c[15], t3);
+ SkScalar a = SkScalarMul(cc[0], SkGetPackedA32(c0)) + SkScalarMul(cc[1], SkGetPackedA32(c1)) + SkScalarMul(cc[2], SkGetPackedA32(c2)) + SkScalarMul(cc[3], SkGetPackedA32(c3));
+ SkScalar r = SkScalarMul(cc[0], SkGetPackedR32(c0)) + SkScalarMul(cc[1], SkGetPackedR32(c1)) + SkScalarMul(cc[2], SkGetPackedR32(c2)) + SkScalarMul(cc[3], SkGetPackedR32(c3));
+ SkScalar g = SkScalarMul(cc[0], SkGetPackedG32(c0)) + SkScalarMul(cc[1], SkGetPackedG32(c1)) + SkScalarMul(cc[2], SkGetPackedG32(c2)) + SkScalarMul(cc[3], SkGetPackedG32(c3));
+ SkScalar b = SkScalarMul(cc[0], SkGetPackedB32(c0)) + SkScalarMul(cc[1], SkGetPackedB32(c1)) + SkScalarMul(cc[2], SkGetPackedB32(c2)) + SkScalarMul(cc[3], SkGetPackedB32(c3));
+ return SkPackARGB32(SkScalarRoundToInt(SkScalarClampMax(a, 255)), SkScalarRoundToInt(SkScalarClampMax(r, 255)), SkScalarRoundToInt(SkScalarClampMax(g, 255)), SkScalarRoundToInt(SkScalarClampMax(b, 255)));
+}
+
+bool SkBicubicImageFilter::onFilterImage(Proxy* proxy,
+ const SkBitmap& source,
+ const SkMatrix& matrix,
+ SkBitmap* result,
+ SkIPoint* loc) {
+ SkBitmap src = this->getInputResult(proxy, source, matrix, loc);
+ if (src.config() != SkBitmap::kARGB_8888_Config) {
+ return false;
+ }
+
+ SkAutoLockPixels alp(src);
+ if (!src.getPixels()) {
+ return false;
+ }
+
+ SkRect dstRect = SkRect::MakeWH(SkScalarMul(SkIntToScalar(src.width()), fScale.fWidth),
+ SkScalarMul(SkIntToScalar(src.height()), fScale.fHeight));
+ SkIRect dstIRect;
+ dstRect.roundOut(&dstIRect);
+ result->setConfig(src.config(), dstIRect.width(), dstIRect.height());
+ result->allocPixels();
+ if (!result->getPixels()) {
+ return false;
+ }
+
+ SkRect srcRect;
+ src.getBounds(&srcRect);
+ SkMatrix inverse;
+ inverse.setRectToRect(dstRect, srcRect, SkMatrix::kFill_ScaleToFit);
+ inverse.postTranslate(SkFloatToScalar(-0.5f), SkFloatToScalar(-0.5f));
+
+ for (int y = dstIRect.fTop; y < dstIRect.fBottom; ++y) {
+ SkPMColor* dptr = result->getAddr32(dstIRect.fLeft, y);
+ for (int x = dstIRect.fLeft; x < dstIRect.fRight; ++x) {
+ SkPoint srcPt, dstPt = SkPoint::Make(SkIntToScalar(x), SkIntToScalar(y));
+ inverse.mapPoints(&srcPt, &dstPt, 1);
+ SkScalar fractx = srcPt.fX - SkScalarFloorToScalar(srcPt.fX);
+ SkScalar fracty = srcPt.fY - SkScalarFloorToScalar(srcPt.fY);
+ int sx = SkScalarFloorToInt(srcPt.fX);
+ int sy = SkScalarFloorToInt(srcPt.fY);
+ int x0 = SkClampMax(sx - 1, src.width() - 1);
+ int x1 = SkClampMax(sx , src.width() - 1);
+ int x2 = SkClampMax(sx + 1, src.width() - 1);
+ int x3 = SkClampMax(sx + 2, src.width() - 1);
+ int y0 = SkClampMax(sy - 1, src.height() - 1);
+ int y1 = SkClampMax(sy , src.height() - 1);
+ int y2 = SkClampMax(sy + 1, src.height() - 1);
+ int y3 = SkClampMax(sy + 2, src.height() - 1);
+ SkPMColor s00 = *src.getAddr32(x0, y0);
+ SkPMColor s10 = *src.getAddr32(x1, y0);
+ SkPMColor s20 = *src.getAddr32(x2, y0);
+ SkPMColor s30 = *src.getAddr32(x3, y0);
+ SkPMColor s0 = cubicBlend(fCoefficients, fractx, s00, s10, s20, s30);
+ SkPMColor s01 = *src.getAddr32(x0, y1);
+ SkPMColor s11 = *src.getAddr32(x1, y1);
+ SkPMColor s21 = *src.getAddr32(x2, y1);
+ SkPMColor s31 = *src.getAddr32(x3, y1);
+ SkPMColor s1 = cubicBlend(fCoefficients, fractx, s01, s11, s21, s31);
+ SkPMColor s02 = *src.getAddr32(x0, y2);
+ SkPMColor s12 = *src.getAddr32(x1, y2);
+ SkPMColor s22 = *src.getAddr32(x2, y2);
+ SkPMColor s32 = *src.getAddr32(x3, y2);
+ SkPMColor s2 = cubicBlend(fCoefficients, fractx, s02, s12, s22, s32);
+ SkPMColor s03 = *src.getAddr32(x0, y3);
+ SkPMColor s13 = *src.getAddr32(x1, y3);
+ SkPMColor s23 = *src.getAddr32(x2, y3);
+ SkPMColor s33 = *src.getAddr32(x3, y3);
+ SkPMColor s3 = cubicBlend(fCoefficients, fractx, s03, s13, s23, s33);
+ *dptr++ = cubicBlend(fCoefficients, fracty, s0, s1, s2, s3);
+ }
+ }
+ return true;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+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 bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
+ virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
+
+ static GrEffectRef* Create(GrTexture* tex, const SkScalar coefficients[16]) {
+ SkAutoTUnref<GrEffect> effect(SkNEW_ARGS(GrBicubicEffect, (tex, coefficients)));
+ return CreateEffectRef(effect);
+ }
+
+private:
+ GrBicubicEffect(GrTexture*, const SkScalar coefficients[16]);
+ float fCoefficients[16];
+
+ GR_DECLARE_EFFECT_TEST;
+
+ typedef GrSingleTextureEffect INHERITED;
+};
+
+class GrGLBicubicEffect : public GrGLEffect {
+public:
+ GrGLBicubicEffect(const GrBackendEffectFactory& factory,
+ const GrEffect& effect);
+ virtual void emitCode(GrGLShaderBuilder*,
+ const GrEffectStage&,
+ EffectKey,
+ const char* vertexCoords,
+ const char* outputColor,
+ const char* inputColor,
+ const TextureSamplerArray&) SK_OVERRIDE;
+
+ static inline EffectKey GenKey(const GrEffectStage&, const GrGLCaps&);
+
+ virtual void setData(const GrGLUniformManager&, const GrEffectStage&) SK_OVERRIDE;
+
+private:
+ typedef GrGLUniformManager::UniformHandle UniformHandle;
+
+ UniformHandle fCoefficientsUni;
+ UniformHandle fImageIncrementUni;
+
+ GrGLEffectMatrix fEffectMatrix;
+
+ typedef GrGLEffect INHERITED;
+};
+
+GrGLBicubicEffect::GrGLBicubicEffect(const GrBackendEffectFactory& factory,
+ const GrEffect& effect)
+ : INHERITED(factory)
+ , fCoefficientsUni(GrGLUniformManager::kInvalidUniformHandle)
+ , fImageIncrementUni(GrGLUniformManager::kInvalidUniformHandle) {
+ const GrBicubicEffect& m = static_cast<const GrBicubicEffect&>(effect);
+}
+
+void GrGLBicubicEffect::emitCode(GrGLShaderBuilder* builder,
+ const GrEffectStage&,
+ EffectKey key,
+ const char* vertexCoords,
+ const char* outputColor,
+ const char* inputColor,
+ const TextureSamplerArray& samplers) {
+ const char* coords;
+ fEffectMatrix.emitCodeMakeFSCoords2D(builder, key, vertexCoords, &coords);
+ fCoefficientsUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
+ kMat44f_GrSLType, "Coefficients");
+ fImageIncrementUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
+ kVec2f_GrSLType, "ImageIncrement");
+ SkString* code = &builder->fFSCode;
+
+ 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->emitFunction(GrGLShaderBuilder::kFragment_ShaderType,
+ 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);
+ code->appendf("\tvec2 coord = %s - %s * vec2(0.5, 0.5);\n", coords, imgInc);
+ code->appendf("\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);
+ code->appendf("\tvec4 s%d%d = ", x, y);
+ builder->appendTextureLookup(&builder->fFSCode, samplers[0], coord.c_str());
+ code->appendf(";\n");
+ }
+ code->appendf("\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);
+ }
+ code->appendf("\t%s = %s(%s, f.y, s0, s1, s2, s3);\n", outputColor, cubicBlendName.c_str(), coeff);
+}
+
+GrGLEffect::EffectKey GrGLBicubicEffect::GenKey(const GrEffectStage& s, const GrGLCaps&) {
+ const GrBicubicEffect& m =
+ static_cast<const GrBicubicEffect&>(*s.getEffect());
+ EffectKey matrixKey = GrGLEffectMatrix::GenKey(m.getMatrix(),
+ s.getCoordChangeMatrix(),
+ m.texture(0));
+ return matrixKey;
+}
+
+void GrGLBicubicEffect::setData(const GrGLUniformManager& uman,
+ const GrEffectStage& stage) {
+ const GrBicubicEffect& effect =
+ static_cast<const GrBicubicEffect&>(*stage.getEffect());
+ 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(),
+ stage.getCoordChangeMatrix(),
+ 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 =
+ static_cast<const 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(SkRandom* random,
+ GrContext* context,
+ 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);
+}
+
+#if SK_SUPPORT_GPU
+GrTexture* SkBicubicImageFilter::filterImageGPU(Proxy* proxy, GrTexture* src, const SkRect& rect) {
+ SkAutoTUnref<GrTexture> srcTexture(this->getInputResultAsTexture(proxy, src, rect));
+ GrContext* context = srcTexture->getContext();
+
+ SkRect dstRect = SkRect::MakeWH(rect.width() * fScale.fWidth,
+ rect.height() * fScale.fHeight);
+
+ GrTextureDesc desc;
+ desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
+ desc.fWidth = SkScalarCeilToInt(dstRect.width());
+ desc.fHeight = SkScalarCeilToInt(dstRect.height());
+ desc.fConfig = kRGBA_8888_GrPixelConfig;
+
+ GrAutoScratchTexture ast(context, desc);
+ if (!ast.texture()) {
+ return NULL;
+ }
+ GrContext::AutoRenderTarget art(context, ast.texture()->asRenderTarget());
+ GrPaint paint;
+ paint.colorStage(0)->setEffect(GrBicubicEffect::Create(srcTexture, fCoefficients));
+ context->drawRectToRect(paint, dstRect, rect);
+ return ast.detach();
+}
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
projects / platform / upstream / libSkiaSharp.git / commitdiff