| /* |
| * 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 "SkReadBuffer.h" |
| #include "SkWriteBuffer.h" |
| #include "SkValidationUtils.h" |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| #if SK_SUPPORT_GPU |
| #include "effects/GrSingleTextureEffect.h" |
| #include "gl/GrGLEffect.h" |
| #include "gl/GrGLShaderBuilder.h" |
| #include "gl/GrGLSL.h" |
| #include "gl/GrGLTexture.h" |
| #include "GrTBackendEffectFactory.h" |
| |
| class GrGLMagnifierEffect; |
| |
| class GrMagnifierEffect : public GrSingleTextureEffect { |
| |
| public: |
| static GrEffect* Create(GrTexture* texture, |
| float xOffset, |
| float yOffset, |
| float xInvZoom, |
| float yInvZoom, |
| float xInvInset, |
| float yInvInset) { |
| return SkNEW_ARGS(GrMagnifierEffect, (texture, |
| xOffset, |
| yOffset, |
| xInvZoom, |
| yInvZoom, |
| xInvInset, |
| yInvInset)); |
| } |
| |
| virtual ~GrMagnifierEffect() {}; |
| |
| static const char* Name() { return "Magnifier"; } |
| |
| virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; |
| virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE; |
| |
| float x_offset() const { return fXOffset; } |
| float y_offset() const { return fYOffset; } |
| float x_inv_zoom() const { return fXInvZoom; } |
| float y_inv_zoom() const { return fYInvZoom; } |
| float x_inv_inset() const { return fXInvInset; } |
| float y_inv_inset() const { return fYInvInset; } |
| |
| typedef GrGLMagnifierEffect GLEffect; |
| |
| private: |
| GrMagnifierEffect(GrTexture* texture, |
| float xOffset, |
| float yOffset, |
| float xInvZoom, |
| float yInvZoom, |
| float xInvInset, |
| float yInvInset) |
| : GrSingleTextureEffect(texture, MakeDivByTextureWHMatrix(texture)) |
| , fXOffset(xOffset) |
| , fYOffset(yOffset) |
| , fXInvZoom(xInvZoom) |
| , fYInvZoom(yInvZoom) |
| , fXInvInset(xInvInset) |
| , fYInvInset(yInvInset) {} |
| |
| virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE; |
| |
| GR_DECLARE_EFFECT_TEST; |
| |
| float fXOffset; |
| float fYOffset; |
| float fXInvZoom; |
| float fYInvZoom; |
| float fXInvInset; |
| float fYInvInset; |
| |
| typedef GrSingleTextureEffect INHERITED; |
| }; |
| |
| // For brevity |
| typedef GrGLUniformManager::UniformHandle UniformHandle; |
| |
| class GrGLMagnifierEffect : public GrGLEffect { |
| public: |
| GrGLMagnifierEffect(const GrBackendEffectFactory&, const GrDrawEffect&); |
| |
| virtual void emitCode(GrGLShaderBuilder*, |
| const GrDrawEffect&, |
| EffectKey, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray&, |
| const TextureSamplerArray&) SK_OVERRIDE; |
| |
| virtual void setData(const GrGLUniformManager&, const GrDrawEffect&) SK_OVERRIDE; |
| |
| private: |
| UniformHandle fOffsetVar; |
| UniformHandle fInvZoomVar; |
| UniformHandle fInvInsetVar; |
| |
| typedef GrGLEffect INHERITED; |
| }; |
| |
| GrGLMagnifierEffect::GrGLMagnifierEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&) |
| : INHERITED(factory) { |
| } |
| |
| void GrGLMagnifierEffect::emitCode(GrGLShaderBuilder* builder, |
| const GrDrawEffect&, |
| EffectKey key, |
| const char* outputColor, |
| const char* inputColor, |
| const TransformedCoordsArray& coords, |
| const TextureSamplerArray& samplers) { |
| SkString coords2D = builder->ensureFSCoords2D(coords, 0); |
| fOffsetVar = builder->addUniform( |
| GrGLShaderBuilder::kFragment_Visibility | |
| GrGLShaderBuilder::kVertex_Visibility, |
| kVec2f_GrSLType, "Offset"); |
| fInvZoomVar = builder->addUniform( |
| GrGLShaderBuilder::kFragment_Visibility | |
| GrGLShaderBuilder::kVertex_Visibility, |
| kVec2f_GrSLType, "InvZoom"); |
| fInvInsetVar = builder->addUniform( |
| GrGLShaderBuilder::kFragment_Visibility | |
| GrGLShaderBuilder::kVertex_Visibility, |
| kVec2f_GrSLType, "InvInset"); |
| |
| builder->fsCodeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str()); |
| builder->fsCodeAppendf("\t\tvec2 zoom_coord = %s + %s * %s;\n", |
| builder->getUniformCStr(fOffsetVar), |
| coords2D.c_str(), |
| builder->getUniformCStr(fInvZoomVar)); |
| |
| builder->fsCodeAppend("\t\tvec2 delta = min(coord, vec2(1.0, 1.0) - coord);\n"); |
| |
| builder->fsCodeAppendf("\t\tdelta = delta * %s;\n", builder->getUniformCStr(fInvInsetVar)); |
| |
| builder->fsCodeAppend("\t\tfloat weight = 0.0;\n"); |
| builder->fsCodeAppend("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n"); |
| builder->fsCodeAppend("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n"); |
| builder->fsCodeAppend("\t\t\tfloat dist = length(delta);\n"); |
| builder->fsCodeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n"); |
| builder->fsCodeAppend("\t\t\tweight = min(dist * dist, 1.0);\n"); |
| builder->fsCodeAppend("\t\t} else {\n"); |
| builder->fsCodeAppend("\t\t\tvec2 delta_squared = delta * delta;\n"); |
| builder->fsCodeAppend("\t\t\tweight = min(min(delta_squared.x, delta_squared.y), 1.0);\n"); |
| builder->fsCodeAppend("\t\t}\n"); |
| |
| builder->fsCodeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n"); |
| builder->fsCodeAppend("\t\tvec4 output_color = "); |
| builder->fsAppendTextureLookup(samplers[0], "mix_coord"); |
| builder->fsCodeAppend(";\n"); |
| |
| builder->fsCodeAppendf("\t\t%s = output_color;", outputColor); |
| SkString modulate; |
| GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor); |
| builder->fsCodeAppend(modulate.c_str()); |
| } |
| |
| void GrGLMagnifierEffect::setData(const GrGLUniformManager& uman, |
| const GrDrawEffect& drawEffect) { |
| const GrMagnifierEffect& zoom = drawEffect.castEffect<GrMagnifierEffect>(); |
| uman.set2f(fOffsetVar, zoom.x_offset(), zoom.y_offset()); |
| uman.set2f(fInvZoomVar, zoom.x_inv_zoom(), zoom.y_inv_zoom()); |
| uman.set2f(fInvInsetVar, zoom.x_inv_inset(), zoom.y_inv_inset()); |
| } |
| |
| ///////////////////////////////////////////////////////////////////// |
| |
| GR_DEFINE_EFFECT_TEST(GrMagnifierEffect); |
| |
| GrEffect* GrMagnifierEffect::TestCreate(SkRandom* random, |
| GrContext* context, |
| const GrDrawTargetCaps&, |
| GrTexture** textures) { |
| GrTexture* texture = textures[0]; |
| 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); |
| uint32_t inset = random->nextULessThan(kMaxInset); |
| |
| GrEffect* effect = GrMagnifierEffect::Create( |
| texture, |
| (float) width / texture->width(), |
| (float) height / texture->height(), |
| texture->width() / (float) x, |
| texture->height() / (float) y, |
| (float) inset / texture->width(), |
| (float) inset / texture->height()); |
| SkASSERT(NULL != effect); |
| return effect; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| const GrBackendEffectFactory& GrMagnifierEffect::getFactory() const { |
| return GrTBackendEffectFactory<GrMagnifierEffect>::getInstance(); |
| } |
| |
| bool GrMagnifierEffect::onIsEqual(const GrEffect& sBase) const { |
| const GrMagnifierEffect& s = CastEffect<GrMagnifierEffect>(sBase); |
| return (this->texture(0) == s.texture(0) && |
| this->fXOffset == s.fXOffset && |
| this->fYOffset == s.fYOffset && |
| this->fXInvZoom == s.fXInvZoom && |
| this->fYInvZoom == s.fYInvZoom && |
| this->fXInvInset == s.fXInvInset && |
| this->fYInvInset == s.fYInvInset); |
| } |
| |
| void GrMagnifierEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const { |
| this->updateConstantColorComponentsForModulation(color, validFlags); |
| } |
| |
| #endif |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| SkMagnifierImageFilter::SkMagnifierImageFilter(SkReadBuffer& buffer) |
| : INHERITED(1, 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(); |
| |
| buffer.validate(SkScalarIsFinite(fInset) && SkIsValidRect(fSrcRect) && |
| // Negative numbers in src rect are not supported |
| (fSrcRect.fLeft >= 0) && (fSrcRect.fTop >= 0)); |
| } |
| |
| SkMagnifierImageFilter::SkMagnifierImageFilter(const SkRect& srcRect, SkScalar inset, |
| SkImageFilter* input) |
| : INHERITED(1, &input), fSrcRect(srcRect), fInset(inset) { |
| SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0); |
| } |
| |
| #if SK_SUPPORT_GPU |
| bool SkMagnifierImageFilter::asNewEffect(GrEffect** effect, GrTexture* texture, const SkMatrix&, |
| const SkIRect&) const { |
| if (effect) { |
| SkScalar yOffset = (texture->origin() == kTopLeft_GrSurfaceOrigin) ? fSrcRect.y() : |
| (texture->height() - (fSrcRect.y() + fSrcRect.height())); |
| SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1; |
| *effect = GrMagnifierEffect::Create(texture, |
| fSrcRect.x() / texture->width(), |
| yOffset / texture->height(), |
| fSrcRect.width() / texture->width(), |
| fSrcRect.height() / texture->height(), |
| texture->width() * invInset, |
| texture->height() * invInset); |
| } |
| return true; |
| } |
| #endif |
| |
| void SkMagnifierImageFilter::flatten(SkWriteBuffer& 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 Context&, SkBitmap* dst, |
| SkIPoint* offset) const { |
| SkASSERT(src.colorType() == kN32_SkColorType); |
| SkASSERT(fSrcRect.width() < src.width()); |
| SkASSERT(fSrcRect.height() < src.height()); |
| |
| if ((src.colorType() != kN32_SkColorType) || |
| (fSrcRect.width() >= src.width()) || |
| (fSrcRect.height() >= src.height())) { |
| return false; |
| } |
| |
| SkAutoLockPixels alp(src); |
| SkASSERT(src.getPixels()); |
| if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) { |
| return false; |
| } |
| |
| if (!dst->allocPixels(src.info())) { |
| 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(); |
| |
| 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 = SkPin32(SkScalarFloorToInt(x_interp), 0, width - 1); |
| int y_val = SkPin32(SkScalarFloorToInt(y_interp), 0, height - 1); |
| |
| *dptr = sptr[y_val * width + x_val]; |
| dptr++; |
| } |
| } |
| return true; |
| } |