| /* |
| * Copyright 2012 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 "SkBitmap.h" |
| #include "SkMagnifierImageFilter.h" |
| #include "SkColorPriv.h" |
| #include "SkFlattenableBuffers.h" |
| |
| #include <algorithm> |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| #if SK_SUPPORT_GPU |
| #include "effects/GrSingleTextureEffect.h" |
| #include "gl/GrGLProgramStage.h" |
| #include "gl/GrGLSL.h" |
| #include "gl/GrGLTexture.h" |
| #include "GrProgramStageFactory.h" |
| |
| class GrGLMagnifierEffect; |
| |
| class GrMagnifierEffect : public GrSingleTextureEffect { |
| |
| public: |
| GrMagnifierEffect(GrTexture* texture, |
| float xOffset, |
| float yOffset, |
| float xZoom, |
| float yZoom, |
| float xInset, |
| float yInset) |
| : GrSingleTextureEffect(texture) |
| , fXOffset(xOffset) |
| , fYOffset(yOffset) |
| , fXZoom(xZoom) |
| , fYZoom(yZoom) |
| , fXInset(xInset) |
| , fYInset(yInset) {} |
| |
| virtual ~GrMagnifierEffect() {}; |
| |
| static const char* Name() { return "Magnifier"; } |
| |
| virtual const GrProgramStageFactory& getFactory() const SK_OVERRIDE; |
| virtual bool isEqual(const GrCustomStage&) const SK_OVERRIDE; |
| |
| float x_offset() const { return fXOffset; } |
| float y_offset() const { return fYOffset; } |
| float x_zoom() const { return fXZoom; } |
| float y_zoom() const { return fYZoom; } |
| float x_inset() const { return fXInset; } |
| float y_inset() const { return fYInset; } |
| |
| typedef GrGLMagnifierEffect GLProgramStage; |
| |
| private: |
| GR_DECLARE_CUSTOM_STAGE_TEST; |
| |
| float fXOffset; |
| float fYOffset; |
| float fXZoom; |
| float fYZoom; |
| float fXInset; |
| float fYInset; |
| |
| typedef GrSingleTextureEffect INHERITED; |
| }; |
| |
| // For brevity |
| typedef GrGLUniformManager::UniformHandle UniformHandle; |
| |
| class GrGLMagnifierEffect : public GrGLProgramStage { |
| public: |
| GrGLMagnifierEffect(const GrProgramStageFactory& factory, |
| const GrCustomStage& stage); |
| |
| virtual void setupVariables(GrGLShaderBuilder* state) SK_OVERRIDE; |
| virtual void emitVS(GrGLShaderBuilder* state, |
| const char* vertexCoords) SK_OVERRIDE; |
| virtual void emitFS(GrGLShaderBuilder* state, |
| const char* outputColor, |
| const char* inputColor, |
| const TextureSamplerArray&) SK_OVERRIDE; |
| |
| virtual void setData(const GrGLUniformManager& uman, |
| const GrCustomStage& data, |
| const GrRenderTarget*, |
| int stageNum) SK_OVERRIDE; |
| |
| static inline StageKey GenKey(const GrCustomStage&, const GrGLCaps&); |
| |
| private: |
| |
| UniformHandle fOffsetVar; |
| UniformHandle fZoomVar; |
| UniformHandle fInsetVar; |
| |
| typedef GrGLProgramStage INHERITED; |
| }; |
| |
| GrGLMagnifierEffect::GrGLMagnifierEffect(const GrProgramStageFactory& factory, |
| const GrCustomStage& stage) |
| : GrGLProgramStage(factory) |
| , fOffsetVar(GrGLUniformManager::kInvalidUniformHandle) |
| , fZoomVar(GrGLUniformManager::kInvalidUniformHandle) |
| , fInsetVar(GrGLUniformManager::kInvalidUniformHandle) { |
| } |
| |
| void GrGLMagnifierEffect::setupVariables(GrGLShaderBuilder* state) { |
| fOffsetVar = state->addUniform( |
| GrGLShaderBuilder::kFragment_ShaderType | |
| GrGLShaderBuilder::kVertex_ShaderType, |
| kVec2f_GrSLType, "uOffset"); |
| fZoomVar = state->addUniform( |
| GrGLShaderBuilder::kFragment_ShaderType | |
| GrGLShaderBuilder::kVertex_ShaderType, |
| kVec2f_GrSLType, "uZoom"); |
| fInsetVar = state->addUniform( |
| GrGLShaderBuilder::kFragment_ShaderType | |
| GrGLShaderBuilder::kVertex_ShaderType, |
| kVec2f_GrSLType, "uInset"); |
| } |
| |
| void GrGLMagnifierEffect::emitVS(GrGLShaderBuilder* state, |
| const char* vertexCoords) { |
| } |
| |
| void GrGLMagnifierEffect::emitFS(GrGLShaderBuilder* state, |
| const char* outputColor, |
| const char* inputColor, |
| const TextureSamplerArray& samplers) { |
| SkString* code = &state->fFSCode; |
| |
| code->appendf("\t\tvec2 coord = %s;\n", state->defaultTexCoordsName()); |
| code->appendf("\t\tvec2 zoom_coord = %s + %s / %s;\n", |
| state->getUniformCStr(fOffsetVar), |
| state->defaultTexCoordsName(), |
| state->getUniformCStr(fZoomVar)); |
| |
| code->appendf("\t\tvec2 delta = min(coord, vec2(1.0, 1.0) - coord);\n"); |
| |
| code->appendf( |
| "\t\tdelta = delta / %s;\n", state->getUniformCStr(fInsetVar)); |
| |
| code->appendf("\t\tfloat weight = 0.0;\n"); |
| code->appendf("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n"); |
| code->appendf("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n"); |
| code->appendf("\t\t\tfloat dist = length(delta);\n"); |
| code->appendf("\t\t\tdist = max(2.0 - dist, 0.0);\n"); |
| code->appendf("\t\t\tweight = min(dist * dist, 1.0);\n"); |
| code->appendf("\t\t} else {\n"); |
| code->appendf("\t\t\tvec2 delta_squared = delta * delta;\n"); |
| code->appendf( |
| "\t\t\tweight = min(min(delta_squared.s, delta_squared.y), 1.0);\n"); |
| code->appendf("\t\t}\n"); |
| |
| code->appendf("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n"); |
| code->appendf("\t\tvec4 output_color = "); |
| state->appendTextureLookup(code, samplers[0], "mix_coord"); |
| code->append(";\n"); |
| |
| code->appendf("\t\t%s = output_color;", outputColor); |
| GrGLSLMulVarBy4f(code, 2, outputColor, inputColor); |
| } |
| |
| void GrGLMagnifierEffect::setData(const GrGLUniformManager& uman, |
| const GrCustomStage& data, |
| const GrRenderTarget*, |
| int stageNum) { |
| const GrMagnifierEffect& zoom = |
| static_cast<const GrMagnifierEffect&>(data); |
| |
| uman.set2f(fOffsetVar, zoom.x_offset(), zoom.y_offset()); |
| uman.set2f(fZoomVar, zoom.x_zoom(), zoom.y_zoom()); |
| uman.set2f(fInsetVar, zoom.x_inset(), zoom.y_inset()); |
| } |
| |
| GrGLProgramStage::StageKey GrGLMagnifierEffect::GenKey(const GrCustomStage& s, |
| const GrGLCaps& caps) { |
| return 0; |
| } |
| |
| ///////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_CUSTOM_STAGE_TEST(GrMagnifierEffect); |
| |
| GrCustomStage* GrMagnifierEffect::TestCreate(SkRandom* random, |
| GrContext* context, |
| GrTexture** textures) { |
| const int kMaxWidth = 200; |
| const int kMaxHeight = 200; |
| const int kMaxInset = 20; |
| uint32_t width = random->nextULessThan(kMaxWidth); |
| uint32_t height = random->nextULessThan(kMaxHeight); |
| uint32_t x = random->nextULessThan(kMaxWidth - width); |
| uint32_t y = random->nextULessThan(kMaxHeight - height); |
| SkScalar inset = SkIntToScalar(random->nextULessThan(kMaxInset)); |
| |
| SkAutoTUnref<SkImageFilter> filter( |
| new SkMagnifierImageFilter( |
| SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y), |
| SkIntToScalar(width), SkIntToScalar(height)), |
| inset)); |
| GrSamplerState sampler; |
| GrCustomStage* stage; |
| filter->asNewCustomStage(&stage, textures[0]); |
| GrAssert(NULL != stage); |
| return stage; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| const GrProgramStageFactory& GrMagnifierEffect::getFactory() const { |
| return GrTProgramStageFactory<GrMagnifierEffect>::getInstance(); |
| } |
| |
| bool GrMagnifierEffect::isEqual(const GrCustomStage& sBase) const { |
| const GrMagnifierEffect& s = |
| static_cast<const GrMagnifierEffect&>(sBase); |
| return (this->fXOffset == s.fXOffset && |
| this->fYOffset == s.fYOffset && |
| this->fXZoom == s.fXZoom && |
| this->fYZoom == s.fYZoom && |
| this->fXInset == s.fXInset && |
| this->fYInset == s.fYInset); |
| } |
| |
| #endif |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| SkMagnifierImageFilter::SkMagnifierImageFilter(SkFlattenableReadBuffer& buffer) |
| : INHERITED(buffer) { |
| float x = buffer.readScalar(); |
| float y = buffer.readScalar(); |
| float width = buffer.readScalar(); |
| float height = buffer.readScalar(); |
| fSrcRect = SkRect::MakeXYWH(x, y, width, height); |
| fInset = buffer.readScalar(); |
| } |
| |
| SkMagnifierImageFilter::SkMagnifierImageFilter(SkRect srcRect, SkScalar inset) |
| : fSrcRect(srcRect), fInset(inset) { |
| SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0); |
| } |
| |
| bool SkMagnifierImageFilter::asNewCustomStage(GrCustomStage** stage, |
| GrTexture* texture) const { |
| #if SK_SUPPORT_GPU |
| if (stage) { |
| *stage = |
| SkNEW_ARGS(GrMagnifierEffect, (texture, |
| fSrcRect.x() / texture->width(), |
| fSrcRect.y() / texture->height(), |
| texture->width() / fSrcRect.width(), |
| texture->height() / fSrcRect.height(), |
| fInset / texture->width(), |
| fInset / texture->height())); |
| } |
| return true; |
| #else |
| return false; |
| #endif |
| } |
| |
| void SkMagnifierImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.writeScalar(fSrcRect.x()); |
| buffer.writeScalar(fSrcRect.y()); |
| buffer.writeScalar(fSrcRect.width()); |
| buffer.writeScalar(fSrcRect.height()); |
| buffer.writeScalar(fInset); |
| } |
| |
| bool SkMagnifierImageFilter::onFilterImage(Proxy*, const SkBitmap& src, |
| const SkMatrix&, SkBitmap* dst, |
| SkIPoint* offset) { |
| SkASSERT(src.config() == SkBitmap::kARGB_8888_Config); |
| SkASSERT(fSrcRect.width() < src.width()); |
| SkASSERT(fSrcRect.height() < src.height()); |
| |
| if (src.config() != SkBitmap::kARGB_8888_Config) { |
| return false; |
| } |
| |
| SkAutoLockPixels alp(src); |
| SkASSERT(src.getPixels()); |
| if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) { |
| return false; |
| } |
| |
| SkScalar inv_inset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1; |
| |
| SkScalar inv_x_zoom = fSrcRect.width() / src.width(); |
| SkScalar inv_y_zoom = fSrcRect.height() / src.height(); |
| |
| dst->setConfig(src.config(), src.width(), src.height()); |
| dst->allocPixels(); |
| SkColor* sptr = src.getAddr32(0, 0); |
| SkColor* dptr = dst->getAddr32(0, 0); |
| int width = src.width(), height = src.height(); |
| for (int y = 0; y < height; ++y) { |
| for (int x = 0; x < width; ++x) { |
| SkScalar x_dist = SkMin32(x, width - x - 1) * inv_inset; |
| SkScalar y_dist = SkMin32(y, height - y - 1) * inv_inset; |
| SkScalar weight = 0; |
| |
| static const SkScalar kScalar2 = SkScalar(2); |
| |
| // To create a smooth curve at the corners, we need to work on |
| // a square twice the size of the inset. |
| if (x_dist < kScalar2 && y_dist < kScalar2) { |
| x_dist = kScalar2 - x_dist; |
| y_dist = kScalar2 - y_dist; |
| |
| SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) + |
| SkScalarSquare(y_dist)); |
| dist = SkMaxScalar(kScalar2 - dist, 0); |
| weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1); |
| } else { |
| SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist), |
| SkScalarSquare(y_dist)); |
| weight = SkMinScalar(sqDist, SK_Scalar1); |
| } |
| |
| SkScalar x_interp = SkScalarMul(weight, (fSrcRect.x() + x * inv_x_zoom)) + |
| (SK_Scalar1 - weight) * x; |
| SkScalar y_interp = SkScalarMul(weight, (fSrcRect.y() + y * inv_y_zoom)) + |
| (SK_Scalar1 - weight) * y; |
| |
| int x_val = SkMin32(SkScalarFloorToInt(x_interp), width - 1); |
| int y_val = SkMin32(SkScalarFloorToInt(y_interp), height - 1); |
| |
| *dptr = sptr[y_val * width + x_val]; |
| dptr++; |
| } |
| } |
| return true; |
| } |