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/GrGLSL.h"
20 #include "gl/GrGLTexture.h"
21 #include "GrTBackendEffectFactory.h"
23 class GrGLMagnifierEffect;
25 class GrMagnifierEffect : public GrSingleTextureEffect {
28 static GrEffectRef* Create(GrTexture* texture,
35 AutoEffectUnref effect(SkNEW_ARGS(GrMagnifierEffect, (texture,
42 return CreateEffectRef(effect);
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, 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 GrGLUniformManager::UniformHandle UniformHandle;
94 class GrGLMagnifierEffect : public GrGLEffect {
96 GrGLMagnifierEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
98 virtual void emitCode(GrGLShaderBuilder*,
101 const char* outputColor,
102 const char* inputColor,
103 const TransformedCoordsArray&,
104 const TextureSamplerArray&) SK_OVERRIDE;
106 virtual void setData(const GrGLUniformManager&, 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(GrGLShaderBuilder* builder,
123 const char* outputColor,
124 const char* inputColor,
125 const TransformedCoordsArray& coords,
126 const TextureSamplerArray& samplers) {
127 SkString coords2D = builder->ensureFSCoords2D(coords, 0);
128 fOffsetVar = builder->addUniform(
129 GrGLShaderBuilder::kFragment_Visibility |
130 GrGLShaderBuilder::kVertex_Visibility,
131 kVec2f_GrSLType, "Offset");
132 fInvZoomVar = builder->addUniform(
133 GrGLShaderBuilder::kFragment_Visibility |
134 GrGLShaderBuilder::kVertex_Visibility,
135 kVec2f_GrSLType, "InvZoom");
136 fInvInsetVar = builder->addUniform(
137 GrGLShaderBuilder::kFragment_Visibility |
138 GrGLShaderBuilder::kVertex_Visibility,
139 kVec2f_GrSLType, "InvInset");
141 builder->fsCodeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str());
142 builder->fsCodeAppendf("\t\tvec2 zoom_coord = %s + %s * %s;\n",
143 builder->getUniformCStr(fOffsetVar),
145 builder->getUniformCStr(fInvZoomVar));
147 builder->fsCodeAppend("\t\tvec2 delta = min(coord, vec2(1.0, 1.0) - coord);\n");
149 builder->fsCodeAppendf("\t\tdelta = delta * %s;\n", builder->getUniformCStr(fInvInsetVar));
151 builder->fsCodeAppend("\t\tfloat weight = 0.0;\n");
152 builder->fsCodeAppend("\t\tif (delta.s < 2.0 && delta.t < 2.0) {\n");
153 builder->fsCodeAppend("\t\t\tdelta = vec2(2.0, 2.0) - delta;\n");
154 builder->fsCodeAppend("\t\t\tfloat dist = length(delta);\n");
155 builder->fsCodeAppend("\t\t\tdist = max(2.0 - dist, 0.0);\n");
156 builder->fsCodeAppend("\t\t\tweight = min(dist * dist, 1.0);\n");
157 builder->fsCodeAppend("\t\t} else {\n");
158 builder->fsCodeAppend("\t\t\tvec2 delta_squared = delta * delta;\n");
159 builder->fsCodeAppend("\t\t\tweight = min(min(delta_squared.x, delta_squared.y), 1.0);\n");
160 builder->fsCodeAppend("\t\t}\n");
162 builder->fsCodeAppend("\t\tvec2 mix_coord = mix(coord, zoom_coord, weight);\n");
163 builder->fsCodeAppend("\t\tvec4 output_color = ");
164 builder->fsAppendTextureLookup(samplers[0], "mix_coord");
165 builder->fsCodeAppend(";\n");
167 builder->fsCodeAppendf("\t\t%s = output_color;", outputColor);
169 GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor);
170 builder->fsCodeAppend(modulate.c_str());
173 void GrGLMagnifierEffect::setData(const GrGLUniformManager& uman,
174 const GrDrawEffect& drawEffect) {
175 const GrMagnifierEffect& zoom = drawEffect.castEffect<GrMagnifierEffect>();
176 uman.set2f(fOffsetVar, zoom.x_offset(), zoom.y_offset());
177 uman.set2f(fInvZoomVar, zoom.x_inv_zoom(), zoom.y_inv_zoom());
178 uman.set2f(fInvInsetVar, zoom.x_inv_inset(), zoom.y_inv_inset());
181 /////////////////////////////////////////////////////////////////////
183 GR_DEFINE_EFFECT_TEST(GrMagnifierEffect);
185 GrEffectRef* GrMagnifierEffect::TestCreate(SkRandom* random,
187 const GrDrawTargetCaps&,
188 GrTexture** textures) {
189 GrTexture* texture = textures[0];
190 const int kMaxWidth = 200;
191 const int kMaxHeight = 200;
192 const int kMaxInset = 20;
193 uint32_t width = random->nextULessThan(kMaxWidth);
194 uint32_t height = random->nextULessThan(kMaxHeight);
195 uint32_t x = random->nextULessThan(kMaxWidth - width);
196 uint32_t y = random->nextULessThan(kMaxHeight - height);
197 uint32_t inset = random->nextULessThan(kMaxInset);
199 GrEffectRef* effect = GrMagnifierEffect::Create(
201 (float) width / texture->width(),
202 (float) height / texture->height(),
203 texture->width() / (float) x,
204 texture->height() / (float) y,
205 (float) inset / texture->width(),
206 (float) inset / texture->height());
207 SkASSERT(NULL != effect);
211 ///////////////////////////////////////////////////////////////////////////////
213 const GrBackendEffectFactory& GrMagnifierEffect::getFactory() const {
214 return GrTBackendEffectFactory<GrMagnifierEffect>::getInstance();
217 bool GrMagnifierEffect::onIsEqual(const GrEffect& sBase) const {
218 const GrMagnifierEffect& s = CastEffect<GrMagnifierEffect>(sBase);
219 return (this->texture(0) == s.texture(0) &&
220 this->fXOffset == s.fXOffset &&
221 this->fYOffset == s.fYOffset &&
222 this->fXInvZoom == s.fXInvZoom &&
223 this->fYInvZoom == s.fYInvZoom &&
224 this->fXInvInset == s.fXInvInset &&
225 this->fYInvInset == s.fYInvInset);
228 void GrMagnifierEffect::getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
229 this->updateConstantColorComponentsForModulation(color, validFlags);
234 ////////////////////////////////////////////////////////////////////////////////
235 SkMagnifierImageFilter::SkMagnifierImageFilter(SkReadBuffer& buffer)
236 : INHERITED(1, buffer) {
237 float x = buffer.readScalar();
238 float y = buffer.readScalar();
239 float width = buffer.readScalar();
240 float height = buffer.readScalar();
241 fSrcRect = SkRect::MakeXYWH(x, y, width, height);
242 fInset = buffer.readScalar();
244 buffer.validate(SkScalarIsFinite(fInset) && SkIsValidRect(fSrcRect) &&
245 // Negative numbers in src rect are not supported
246 (fSrcRect.fLeft >= 0) && (fSrcRect.fTop >= 0));
249 // FIXME: implement single-input semantics
250 SkMagnifierImageFilter::SkMagnifierImageFilter(const SkRect& srcRect, SkScalar inset)
251 : INHERITED(0), fSrcRect(srcRect), fInset(inset) {
252 SkASSERT(srcRect.x() >= 0 && srcRect.y() >= 0 && inset >= 0);
256 bool SkMagnifierImageFilter::asNewEffect(GrEffectRef** effect, GrTexture* texture, const SkMatrix&, const SkIRect&) const {
258 SkScalar yOffset = (texture->origin() == kTopLeft_GrSurfaceOrigin) ? fSrcRect.y() :
259 (texture->height() - (fSrcRect.y() + fSrcRect.height()));
260 SkScalar invInset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1;
261 *effect = GrMagnifierEffect::Create(texture,
262 fSrcRect.x() / texture->width(),
263 yOffset / texture->height(),
264 fSrcRect.width() / texture->width(),
265 fSrcRect.height() / texture->height(),
266 texture->width() * invInset,
267 texture->height() * invInset);
273 void SkMagnifierImageFilter::flatten(SkWriteBuffer& buffer) const {
274 this->INHERITED::flatten(buffer);
275 buffer.writeScalar(fSrcRect.x());
276 buffer.writeScalar(fSrcRect.y());
277 buffer.writeScalar(fSrcRect.width());
278 buffer.writeScalar(fSrcRect.height());
279 buffer.writeScalar(fInset);
282 bool SkMagnifierImageFilter::onFilterImage(Proxy*, const SkBitmap& src,
283 const Context&, SkBitmap* dst,
284 SkIPoint* offset) const {
285 SkASSERT(src.colorType() == kPMColor_SkColorType);
286 SkASSERT(fSrcRect.width() < src.width());
287 SkASSERT(fSrcRect.height() < src.height());
289 if ((src.colorType() != kPMColor_SkColorType) ||
290 (fSrcRect.width() >= src.width()) ||
291 (fSrcRect.height() >= src.height())) {
295 SkAutoLockPixels alp(src);
296 SkASSERT(src.getPixels());
297 if (!src.getPixels() || src.width() <= 0 || src.height() <= 0) {
301 dst->setConfig(src.config(), src.width(), src.height());
303 if (!dst->getPixels()) {
307 SkScalar inv_inset = fInset > 0 ? SkScalarInvert(fInset) : SK_Scalar1;
309 SkScalar inv_x_zoom = fSrcRect.width() / src.width();
310 SkScalar inv_y_zoom = fSrcRect.height() / src.height();
312 SkColor* sptr = src.getAddr32(0, 0);
313 SkColor* dptr = dst->getAddr32(0, 0);
314 int width = src.width(), height = src.height();
315 for (int y = 0; y < height; ++y) {
316 for (int x = 0; x < width; ++x) {
317 SkScalar x_dist = SkMin32(x, width - x - 1) * inv_inset;
318 SkScalar y_dist = SkMin32(y, height - y - 1) * inv_inset;
321 static const SkScalar kScalar2 = SkScalar(2);
323 // To create a smooth curve at the corners, we need to work on
324 // a square twice the size of the inset.
325 if (x_dist < kScalar2 && y_dist < kScalar2) {
326 x_dist = kScalar2 - x_dist;
327 y_dist = kScalar2 - y_dist;
329 SkScalar dist = SkScalarSqrt(SkScalarSquare(x_dist) +
330 SkScalarSquare(y_dist));
331 dist = SkMaxScalar(kScalar2 - dist, 0);
332 weight = SkMinScalar(SkScalarSquare(dist), SK_Scalar1);
334 SkScalar sqDist = SkMinScalar(SkScalarSquare(x_dist),
335 SkScalarSquare(y_dist));
336 weight = SkMinScalar(sqDist, SK_Scalar1);
339 SkScalar x_interp = SkScalarMul(weight, (fSrcRect.x() + x * inv_x_zoom)) +
340 (SK_Scalar1 - weight) * x;
341 SkScalar y_interp = SkScalarMul(weight, (fSrcRect.y() + y * inv_y_zoom)) +
342 (SK_Scalar1 - weight) * y;
344 int x_val = SkPin32(SkScalarFloorToInt(x_interp), 0, width - 1);
345 int y_val = SkPin32(SkScalarFloorToInt(y_interp), 0, height - 1);
347 *dptr = sptr[y_val * width + x_val];