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/*
* 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"
////////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
#include "effects/GrSingleTextureEffect.h"
#include "gl/GrGLEffect.h"
#include "gl/GrGLSL.h"
#include "gl/GrGLTexture.h"
#include "GrTBackendEffectFactory.h"
class GrGLMagnifierEffect;
class GrMagnifierEffect : public GrSingleTextureEffect {
public:
static GrEffectRef* Create(GrTexture* texture,
float xOffset,
float yOffset,
float xZoom,
float yZoom,
float xInset,
float yInset) {
AutoEffectUnref effect(SkNEW_ARGS(GrMagnifierEffect, (texture,
xOffset,
yOffset,
xZoom,
yZoom,
xInset,
yInset)));
return CreateEffectRef(effect);
}
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_zoom() const { return fXZoom; }
float y_zoom() const { return fYZoom; }
float x_inset() const { return fXInset; }
float y_inset() const { return fYInset; }
typedef GrGLMagnifierEffect GLEffect;
private:
GrMagnifierEffect(GrTexture* texture,
float xOffset,
float yOffset,
float xZoom,
float yZoom,
float xInset,
float yInset)
: GrSingleTextureEffect(texture, MakeDivByTextureWHMatrix(texture))
, fXOffset(xOffset)
, fYOffset(yOffset)
, fXZoom(xZoom)
, fYZoom(yZoom)
, fXInset(xInset)
, fYInset(yInset) {}
virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
GR_DECLARE_EFFECT_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 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 fZoomVar;
UniformHandle fInsetVar;
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, "uOffset");
fZoomVar = builder->addUniform(
GrGLShaderBuilder::kFragment_Visibility |
GrGLShaderBuilder::kVertex_Visibility,
kVec2f_GrSLType, "uZoom");
fInsetVar = builder->addUniform(
GrGLShaderBuilder::kFragment_Visibility |
GrGLShaderBuilder::kVertex_Visibility,
kVec2f_GrSLType, "uInset");
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(fZoomVar));
builder->fsCodeAppend("\t\tvec2 delta = min(coord, vec2(1.0, 1.0) - coord);\n");
builder->fsCodeAppendf("\t\tdelta = delta / %s;\n", builder->getUniformCStr(fInsetVar));
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.s, 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(fZoomVar, zoom.x_zoom(), zoom.y_zoom());
uman.set2f(fInsetVar, zoom.x_inset(), zoom.y_inset());
}
/////////////////////////////////////////////////////////////////////
GR_DEFINE_EFFECT_TEST(GrMagnifierEffect);
GrEffectRef* 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);
GrEffectRef* 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->fXZoom == s.fXZoom &&
this->fYZoom == s.fYZoom &&
this->fXInset == s.fXInset &&
this->fYInset == s.fYInset);
}
void GrMagnifierEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
this->updateConstantColorComponentsForModulation(color, validFlags);
}
#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();
}
// FIXME: implement single-input semantics
SkMagnifierImageFilter::SkMagnifierImageFilter(SkRect srcRect, SkScalar inset)
: INHERITED(0), fSrcRect(srcRect), fInset(inset) {
SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0);
}
#if SK_SUPPORT_GPU
bool SkMagnifierImageFilter::asNewEffect(GrEffectRef** effect, GrTexture* texture, const SkMatrix&) const {
if (effect) {
*effect = GrMagnifierEffect::Create(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;
}
#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;
}
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