2 * Copyright 2012 The Android Open Source Project
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
9 #include "SkMagnifierImageFilter.h"
10 #include "SkColorPriv.h"
11 #include "SkReadBuffer.h"
12 #include "SkWriteBuffer.h"
13 #include "SkValidationUtils.h"
15 ////////////////////////////////////////////////////////////////////////////////
17 #include "effects/GrSingleTextureEffect.h"
18 #include "gl/GrGLEffect.h"
19 #include "gl/builders/GrGLProgramBuilder.h"
20 #include "gl/GrGLSL.h"
21 #include "gl/GrGLTexture.h"
22 #include "GrTBackendEffectFactory.h"
24 class GrGLMagnifierEffect;
26 class GrMagnifierEffect : public GrSingleTextureEffect {
29 static GrEffect* Create(GrTexture* texture,
36 return SkNEW_ARGS(GrMagnifierEffect, (texture,
45 virtual ~GrMagnifierEffect() {};
47 static const char* Name() { return "Magnifier"; }
49 virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
50 virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const SK_OVERRIDE;
52 float x_offset() const { return fXOffset; }
53 float y_offset() const { return fYOffset; }
54 float x_inv_zoom() const { return fXInvZoom; }
55 float y_inv_zoom() const { return fYInvZoom; }
56 float x_inv_inset() const { return fXInvInset; }
57 float y_inv_inset() const { return fYInvInset; }
59 typedef GrGLMagnifierEffect GLEffect;
62 GrMagnifierEffect(GrTexture* texture,
69 : GrSingleTextureEffect(texture, GrCoordTransform::MakeDivByTextureWHMatrix(texture))
74 , fXInvInset(xInvInset)
75 , fYInvInset(yInvInset) {}
77 virtual bool onIsEqual(const GrEffect&) const SK_OVERRIDE;
79 GR_DECLARE_EFFECT_TEST;
88 typedef GrSingleTextureEffect INHERITED;
92 typedef GrGLProgramDataManager::UniformHandle UniformHandle;
94 class GrGLMagnifierEffect : public GrGLEffect {
96 GrGLMagnifierEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
98 virtual void emitCode(GrGLProgramBuilder*,
101 const char* outputColor,
102 const char* inputColor,
103 const TransformedCoordsArray&,
104 const TextureSamplerArray&) SK_OVERRIDE;
106 virtual void setData(const GrGLProgramDataManager&, const GrDrawEffect&) SK_OVERRIDE;
109 UniformHandle fOffsetVar;
110 UniformHandle fInvZoomVar;
111 UniformHandle fInvInsetVar;
113 typedef GrGLEffect INHERITED;
116 GrGLMagnifierEffect::GrGLMagnifierEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
117 : INHERITED(factory) {
120 void GrGLMagnifierEffect::emitCode(GrGLProgramBuilder* builder,
122 const GrEffectKey& key,
123 const char* outputColor,
124 const char* inputColor,
125 const TransformedCoordsArray& coords,
126 const TextureSamplerArray& samplers) {
127 fOffsetVar = builder->addUniform(
128 GrGLProgramBuilder::kFragment_Visibility |
129 GrGLProgramBuilder::kVertex_Visibility,
130 kVec2f_GrSLType, "Offset");
131 fInvZoomVar = builder->addUniform(
132 GrGLProgramBuilder::kFragment_Visibility |
133 GrGLProgramBuilder::kVertex_Visibility,
134 kVec2f_GrSLType, "InvZoom");
135 fInvInsetVar = builder->addUniform(
136 GrGLProgramBuilder::kFragment_Visibility |
137 GrGLProgramBuilder::kVertex_Visibility,
138 kVec2f_GrSLType, "InvInset");
140 GrGLFragmentShaderBuilder* fsBuilder = builder->getFragmentShaderBuilder();
141 SkString coords2D = fsBuilder->ensureFSCoords2D(coords, 0);
142 fsBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str());
143 fsBuilder->codeAppendf("\t\tvec2 zoom_coord = %s + %s * %s;\n",
144 builder->getUniformCStr(fOffsetVar),
146 builder->getUniformCStr(fInvZoomVar));
148 fsBuilder->codeAppend("\t\tvec2 delta = min(coord, vec2(1.0, 1.0) - coord);\n");
150 fsBuilder->codeAppendf("\t\tdelta = delta * %s;\n", builder->getUniformCStr(fInvInsetVar));
152 fsBuilder->codeAppend("\t\tfloat weight = 0.0;\n");
153 fsBuilder->codeAppend("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n");
154 fsBuilder->codeAppend("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n");
155 fsBuilder->codeAppend("\t\t\tfloat dist = length(delta);\n");
156 fsBuilder->codeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n");
157 fsBuilder->codeAppend("\t\t\tweight = min(dist * dist, 1.0);\n");
158 fsBuilder->codeAppend("\t\t} else {\n");
159 fsBuilder->codeAppend("\t\t\tvec2 delta_squared = delta * delta;\n");
160 fsBuilder->codeAppend("\t\t\tweight = min(min(delta_squared.x, delta_squared.y), 1.0);\n");
161 fsBuilder->codeAppend("\t\t}\n");
163 fsBuilder->codeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n");
164 fsBuilder->codeAppend("\t\tvec4 output_color = ");
165 fsBuilder->appendTextureLookup(samplers[0], "mix_coord");
166 fsBuilder->codeAppend(";\n");
168 fsBuilder->codeAppendf("\t\t%s = output_color;", outputColor);
170 GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor);
171 fsBuilder->codeAppend(modulate.c_str());
174 void GrGLMagnifierEffect::setData(const GrGLProgramDataManager& pdman,
175 const GrDrawEffect& drawEffect) {
176 const GrMagnifierEffect& zoom = drawEffect.castEffect<GrMagnifierEffect>();
177 pdman.set2f(fOffsetVar, zoom.x_offset(), zoom.y_offset());
178 pdman.set2f(fInvZoomVar, zoom.x_inv_zoom(), zoom.y_inv_zoom());
179 pdman.set2f(fInvInsetVar, zoom.x_inv_inset(), zoom.y_inv_inset());
182 /////////////////////////////////////////////////////////////////////
184 GR_DEFINE_EFFECT_TEST(GrMagnifierEffect);
186 GrEffect* GrMagnifierEffect::TestCreate(SkRandom* random,
188 const GrDrawTargetCaps&,
189 GrTexture** textures) {
190 GrTexture* texture = textures[0];
191 const int kMaxWidth = 200;
192 const int kMaxHeight = 200;
193 const int kMaxInset = 20;
194 uint32_t width = random->nextULessThan(kMaxWidth);
195 uint32_t height = random->nextULessThan(kMaxHeight);
196 uint32_t x = random->nextULessThan(kMaxWidth - width);
197 uint32_t y = random->nextULessThan(kMaxHeight - height);
198 uint32_t inset = random->nextULessThan(kMaxInset);
200 GrEffect* effect = GrMagnifierEffect::Create(
202 (float) width / texture->width(),
203 (float) height / texture->height(),
204 texture->width() / (float) x,
205 texture->height() / (float) y,
206 (float) inset / texture->width(),
207 (float) inset / texture->height());
212 ///////////////////////////////////////////////////////////////////////////////
214 const GrBackendEffectFactory& GrMagnifierEffect::getFactory() const {
215 return GrTBackendEffectFactory<GrMagnifierEffect>::getInstance();
218 bool GrMagnifierEffect::onIsEqual(const GrEffect& sBase) const {
219 const GrMagnifierEffect& s = CastEffect<GrMagnifierEffect>(sBase);
220 return (this->texture(0) == s.texture(0) &&
221 this->fXOffset == s.fXOffset &&
222 this->fYOffset == s.fYOffset &&
223 this->fXInvZoom == s.fXInvZoom &&
224 this->fYInvZoom == s.fYInvZoom &&
225 this->fXInvInset == s.fXInvInset &&
226 this->fYInvInset == s.fYInvInset);
229 void GrMagnifierEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
230 this->updateConstantColorComponentsForModulation(color, validFlags);
235 ////////////////////////////////////////////////////////////////////////////////
237 SkImageFilter* SkMagnifierImageFilter::Create(const SkRect& srcRect, SkScalar inset,
238 SkImageFilter* input) {
240 if (!SkScalarIsFinite(inset) || !SkIsValidRect(srcRect)) {
243 // Negative numbers in src rect are not supported
244 if (srcRect.fLeft < 0 || srcRect.fTop < 0) {
247 return SkNEW_ARGS(SkMagnifierImageFilter, (srcRect, inset, input));
251 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
252 SkMagnifierImageFilter::SkMagnifierImageFilter(SkReadBuffer& buffer)
253 : INHERITED(1, buffer) {
254 float x = buffer.readScalar();
255 float y = buffer.readScalar();
256 float width = buffer.readScalar();
257 float height = buffer.readScalar();
258 fSrcRect = SkRect::MakeXYWH(x, y, width, height);
259 fInset = buffer.readScalar();
261 buffer.validate(SkScalarIsFinite(fInset) && SkIsValidRect(fSrcRect) &&
262 // Negative numbers in src rect are not supported
263 (fSrcRect.fLeft >= 0) && (fSrcRect.fTop >= 0));
267 SkMagnifierImageFilter::SkMagnifierImageFilter(const SkRect& srcRect, SkScalar inset,
268 SkImageFilter* input)
269 : INHERITED(1, &input), fSrcRect(srcRect), fInset(inset) {
270 SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0);
274 bool SkMagnifierImageFilter::asNewEffect(GrEffect** effect, GrTexture* texture, const SkMatrix&,
275 const SkIRect&) const {
277 SkScalar yOffset = (texture->origin() == kTopLeft_GrSurfaceOrigin) ? fSrcRect.y() :
278 (texture->height() - (fSrcRect.y() + fSrcRect.height()));
279 SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1;
280 *effect = GrMagnifierEffect::Create(texture,
281 fSrcRect.x() / texture->width(),
282 yOffset / texture->height(),
283 fSrcRect.width() / texture->width(),
284 fSrcRect.height() / texture->height(),
285 texture->width() * invInset,
286 texture->height() * invInset);
292 SkFlattenable* SkMagnifierImageFilter::CreateProc(SkReadBuffer& buffer) {
293 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
295 buffer.readRect(&src);
296 return Create(src, buffer.readScalar(), common.getInput(0));
299 void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const {
300 this->INHERITED::flatten(buffer);
301 buffer.writeRect(fSrcRect);
302 buffer.writeScalar(fInset);
305 bool SkMagnifierImageFilter::onFilterImage(Proxy*, const SkBitmap& src,
306 const Context&, SkBitmap* dst,
307 SkIPoint* offset) const {
308 SkASSERT(src.colorType() == kN32_SkColorType);
309 SkASSERT(fSrcRect.width() < src.width());
310 SkASSERT(fSrcRect.height() < src.height());
312 if ((src.colorType() != kN32_SkColorType) ||
313 (fSrcRect.width() >= src.width()) ||
314 (fSrcRect.height() >= src.height())) {
318 SkAutoLockPixels alp(src);
319 SkASSERT(src.getPixels());
320 if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) {
324 if (!dst->tryAllocPixels(src.info())) {
328 SkScalar inv_inset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1;
330 SkScalar inv_x_zoom = fSrcRect.width() / src.width();
331 SkScalar inv_y_zoom = fSrcRect.height() / src.height();
333 SkColor* sptr = src.getAddr32(0, 0);
334 SkColor* dptr = dst->getAddr32(0, 0);
335 int width = src.width(), height = src.height();
336 for (int y = 0; y < height; ++y) {
337 for (int x = 0; x < width; ++x) {
338 SkScalar x_dist = SkMin32(x, width - x - 1) * inv_inset;
339 SkScalar y_dist = SkMin32(y, height - y - 1) * inv_inset;
342 static const SkScalar kScalar2 = SkScalar(2);
344 // To create a smooth curve at the corners, we need to work on
345 // a square twice the size of the inset.
346 if (x_dist < kScalar2 && y_dist < kScalar2) {
347 x_dist = kScalar2 - x_dist;
348 y_dist = kScalar2 - y_dist;
350 SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) +
351 SkScalarSquare(y_dist));
352 dist = SkMaxScalar(kScalar2 - dist, 0);
353 weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1);
355 SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist),
356 SkScalarSquare(y_dist));
357 weight = SkMinScalar(sqDist, SK_Scalar1);
360 SkScalar x_interp = SkScalarMul(weight, (fSrcRect.x() + x * inv_x_zoom)) +
361 (SK_Scalar1 - weight) * x;
362 SkScalar y_interp = SkScalarMul(weight, (fSrcRect.y() + y * inv_y_zoom)) +
363 (SK_Scalar1 - weight) * y;
365 int x_val = SkPin32(SkScalarFloorToInt(x_interp), 0, width - 1);
366 int y_val = SkPin32(SkScalarFloorToInt(y_interp), 0, height - 1);
368 *dptr = sptr[y_val * width + x_val];