src/effects/SkBlurImageFilter.cpp - Issue 2255803003: Moving SkBlurImageFilter into core

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Issue 2255803003: Moving SkBlurImageFilter into core (Closed) Base URL: https://skia.googlesource.com/skia@master

Patch Set: ... made req changes onto correct branch Created 4 years, 3 months ago

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1 /*

2 * Copyright 2011 The Android Open Source Project

3 *

4 * Use of this source code is governed by a BSD-style license that can be

5 * found in the LICENSE file.

6 */

7

8 #include "SkBlurImageFilter.h"

9

10 #include "SkAutoPixmapStorage.h"

11 #include "SkColorPriv.h"

12 #include "SkGpuBlurUtils.h"

13 #include "SkOpts.h"

14 #include "SkReadBuffer.h"

15 #include "SkSpecialImage.h"

16 #include "SkWriteBuffer.h"

17

18 #if SK_SUPPORT_GPU

19 #include "GrContext.h"

20 #include "SkGr.h"

21 #endif

22

23 sk_sp<SkImageFilter> SkBlurImageFilter::Make(SkScalar sigmaX, SkScalar sigmaY,

24 sk_sp<SkImageFilter> input,

25 const CropRect* cropRect) {

26 if (0 == sigmaX && 0 == sigmaY && !cropRect) {

27 return input;

28 }

29 return sk_sp<SkImageFilter>(new SkBlurImageFilter(sigmaX, sigmaY, input, cro pRect));

30 }

31

32 // This rather arbitrary-looking value results in a maximum box blur kernel size

33 // of 1000 pixels on the raster path, which matches the WebKit and Firefox

34 // implementations. Since the GPU path does not compute a box blur, putting

35 // the limit on sigma ensures consistent behaviour between the GPU and

36 // raster paths.

37 #define MAX_SIGMA SkIntToScalar(532)

38

39 static SkVector map_sigma(const SkSize& localSigma, const SkMatrix& ctm) {

40 SkVector sigma = SkVector::Make(localSigma.width(), localSigma.height());

41 ctm.mapVectors(&sigma, 1);

42 sigma.fX = SkMinScalar(SkScalarAbs(sigma.fX), MAX_SIGMA);

43 sigma.fY = SkMinScalar(SkScalarAbs(sigma.fY), MAX_SIGMA);

44 return sigma;

45 }

46

47 SkBlurImageFilter::SkBlurImageFilter(SkScalar sigmaX,

48 SkScalar sigmaY,

49 sk_sp<SkImageFilter> input,

50 const CropRect* cropRect)

51 : INHERITED(&input, 1, cropRect)

52 , fSigma(SkSize::Make(sigmaX, sigmaY)) {

53 }

54

55 sk_sp<SkFlattenable> SkBlurImageFilter::CreateProc(SkReadBuffer& buffer) {

56 SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);

57 SkScalar sigmaX = buffer.readScalar();

58 SkScalar sigmaY = buffer.readScalar();

59 return Make(sigmaX, sigmaY, common.getInput(0), &common.cropRect());

60 }

61

62 void SkBlurImageFilter::flatten(SkWriteBuffer& buffer) const {

63 this->INHERITED::flatten(buffer);

64 buffer.writeScalar(fSigma.fWidth);

65 buffer.writeScalar(fSigma.fHeight);

66 }

67

68 static void get_box3_params(SkScalar s, int kernelSize, int kernelSize3, int * lowOffset,

69 int *highOffset) {

70 float pi = SkScalarToFloat(SK_ScalarPI);

71 int d = static_cast<int>(floorf(SkScalarToFloat(s) * 3.0f * sqrtf(2.0f * pi) / 4.0f + 0.5f));

72 *kernelSize = d;

73 if (d % 2 == 1) {

74 lowOffset = highOffset = (d - 1) / 2;

75 *kernelSize3 = d;

76 } else {

77 *highOffset = d / 2;

78 lowOffset = highOffset - 1;

79 *kernelSize3 = d + 1;

80 }

81 }

82

83 sk_sp<SkSpecialImage> SkBlurImageFilter::onFilterImage(SkSpecialImage* source,

84 const Context& ctx,

85 SkIPoint* offset) const {

86 SkIPoint inputOffset = SkIPoint::Make(0, 0);

87

88 sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset)) ;

89 if (!input) {

90 return nullptr;

91 }

92

93 SkIRect inputBounds = SkIRect::MakeXYWH(inputOffset.fX, inputOffset.fY,

94 input->width(), input->height());

95

96 SkIRect dstBounds;

97 if (!this->applyCropRect(this->mapContext(ctx), inputBounds, &dstBounds)) {

98 return nullptr;

99 }

100 if (!inputBounds.intersect(dstBounds)) {

101 return nullptr;

102 }

103

104 const SkVector sigma = map_sigma(fSigma, ctx.ctm());

105

106 #if SK_SUPPORT_GPU

107 if (source->isTextureBacked()) {

108 GrContext* context = source->getContext();

109 sk_sp<GrTexture> inputTexture(input->asTextureRef(context));

110 SkASSERT(inputTexture);

111

112 if (0 == sigma.x() && 0 == sigma.y()) {

113 offset->fX = inputBounds.x();

114 offset->fY = inputBounds.y();

115 return input->makeSubset(inputBounds.makeOffset(-inputOffset.x(),

116 -inputOffset.y()));

117 }

118

119 offset->fX = dstBounds.fLeft;

120 offset->fY = dstBounds.fTop;

121 inputBounds.offset(-inputOffset);

122 dstBounds.offset(-inputOffset);

123 sk_sp<GrDrawContext> drawContext(SkGpuBlurUtils::GaussianBlur(

124 context,

125 inputTexture.get (),

126 sk_ref_sp(source ->getColorSpace()),

127 dstBounds,

128 &inputBounds,

129 sigma.x(),

130 sigma.y()));

131 if (!drawContext) {

132 return nullptr;

133 }

134

135 // TODO: Get the colorSpace from the drawContext (once it has one)

136 return SkSpecialImage::MakeFromGpu(SkIRect::MakeWH(dstBounds.width(), ds tBounds.height()),

137 kNeedNewImageUniqueID_SpecialImage,

138 drawContext->asTexture(),

139 sk_ref_sp(input->getColorSpace()), &s ource->props());

140 }

141 #endif

142

143 int kernelSizeX, kernelSizeX3, lowOffsetX, highOffsetX;

144 int kernelSizeY, kernelSizeY3, lowOffsetY, highOffsetY;

145 get_box3_params(sigma.x(), &kernelSizeX, &kernelSizeX3, &lowOffsetX, &highOf fsetX);

146 get_box3_params(sigma.y(), &kernelSizeY, &kernelSizeY3, &lowOffsetY, &highOf fsetY);

147

148 if (kernelSizeX < 0 \|\| kernelSizeY < 0) {

149 return nullptr;

150 }

151

152 if (kernelSizeX == 0 && kernelSizeY == 0) {

153 offset->fX = inputBounds.x();

154 offset->fY = inputBounds.y();

155 return input->makeSubset(inputBounds.makeOffset(-inputOffset.x(),

156 -inputOffset.y()));

157 }

158

159 SkBitmap inputBM;

160

161 if (!input->getROPixels(&inputBM)) {

162 return nullptr;

163 }

164

165 if (inputBM.colorType() != kN32_SkColorType) {

166 return nullptr;

167 }

168

169 SkImageInfo info = SkImageInfo::Make(dstBounds.width(), dstBounds.height(),

170 inputBM.colorType(), inputBM.alphaType( ));

171

172 SkBitmap tmp, dst;

173 if (!tmp.tryAllocPixels(info) \|\| !dst.tryAllocPixels(info)) {

174 return nullptr;

175 }

176

177 SkAutoLockPixels inputLock(inputBM), tmpLock(tmp), dstLock(dst);

178

179 offset->fX = dstBounds.fLeft;

180 offset->fY = dstBounds.fTop;

181 SkPMColor* t = tmp.getAddr32(0, 0);

182 SkPMColor* d = dst.getAddr32(0, 0);

183 int w = dstBounds.width(), h = dstBounds.height();

184 const SkPMColor* s = inputBM.getAddr32(inputBounds.x() - inputOffset.x(),

185 inputBounds.y() - inputOffset.y());

186 inputBounds.offset(-dstBounds.x(), -dstBounds.y());

187 dstBounds.offset(-dstBounds.x(), -dstBounds.y());

188 SkIRect inputBoundsT = SkIRect::MakeLTRB(inputBounds.top(), inputBounds.left (),

189 inputBounds.bottom(), inputBounds.r ight());

190 SkIRect dstBoundsT = SkIRect::MakeWH(dstBounds.height(), dstBounds.width());

191 int sw = int(inputBM.rowBytes() >> 2);

192

193 /**

194 *

195 * In order to make memory accesses cache-friendly, we reorder the passes to

196 * use contiguous memory reads wherever possible.

197 *

198 * For example, the 6 passes of the X-and-Y blur case are rewritten as

199 * follows. Instead of 3 passes in X and 3 passes in Y, we perform

200 * 2 passes in X, 1 pass in X transposed to Y on write, 2 passes in X,

201 * then 1 pass in X transposed to Y on write.

202 *

203 * +----+ +----+ +----+ +---+ +---+ +---+ +----+

204 * + AB + ----> \| AB \| ----> \| AB \| -----> \| A \| ----> \| A \| ----> \| A \| --- --> \| AB \|

205 * +----+ blurX +----+ blurX +----+ blurXY \| B \| blurX \| B \| blurX \| B \| blu rXY +----+

206 * +---+ +---+ +---+

207 *

208 * In this way, two of the y-blurs become x-blurs applied to transposed

209 * images, and all memory reads are contiguous.

210 */

211 if (kernelSizeX > 0 && kernelSizeY > 0) {

212 SkOpts::box_blur_xx(s, sw, inputBounds, t, kernelSizeX, lowOffsetX, highOffsetX, w, h);

213 SkOpts::box_blur_xx(t, w, dstBounds, d, kernelSizeX, highOffsetX, lowOffsetX, w, h);

214 SkOpts::box_blur_xy(d, w, dstBounds, t, kernelSizeX3, highOffsetX, highOffsetX, w, h);

215 SkOpts::box_blur_xx(t, h, dstBoundsT, d, kernelSizeY, lowOffsetY, highOffsetY, h, w);

216 SkOpts::box_blur_xx(d, h, dstBoundsT, t, kernelSizeY, highOffsetY, lowOffsetY, h, w);

217 SkOpts::box_blur_xy(t, h, dstBoundsT, d, kernelSizeY3, highOffsetY, highOffsetY, h, w);

218 } else if (kernelSizeX > 0) {

219 SkOpts::box_blur_xx(s, sw, inputBounds, d, kernelSizeX, lowOffsetX, highOffsetX, w, h);

220 SkOpts::box_blur_xx(d, w, dstBounds, t, kernelSizeX, highOffsetX, lowOffsetX, w, h);

221 SkOpts::box_blur_xx(t, w, dstBounds, d, kernelSizeX3, highOffsetX, highOffsetX, w, h);

222 } else if (kernelSizeY > 0) {

223 SkOpts::box_blur_yx(s, sw, inputBoundsT, d, kernelSizeY, lowOffsetY, highOffsetY, h, w);

224 SkOpts::box_blur_xx(d, h, dstBoundsT, t, kernelSizeY, highOffsetY, lowOffsetY, h, w);

225 SkOpts::box_blur_xy(t, h, dstBoundsT, d, kernelSizeY3, highOffsetY, highOffsetY, h, w);

226 }

227

228 return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(dstBounds.width(),

229 dstBounds.height()),

230 dst, &source->props());

231 }

232

233

234 SkRect SkBlurImageFilter::computeFastBounds(const SkRect& src) const {

235 SkRect bounds = this->getInput(0) ? this->getInput(0)->computeFastBounds(src ) : src;

236 bounds.outset(SkScalarMul(fSigma.width(), SkIntToScalar(3)),

237 SkScalarMul(fSigma.height(), SkIntToScalar(3)));

238 return bounds;

239 }

240

241 SkIRect SkBlurImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix & ctm,

242 MapDirection) const {

243 SkVector sigma = map_sigma(fSigma, ctm);

244 return src.makeOutset(SkScalarCeilToInt(SkScalarMul(sigma.x(), SkIntToScalar (3))),

245 SkScalarCeilToInt(SkScalarMul(sigma.y(), SkIntToScalar (3))));

246 }

247

248 #ifndef SK_IGNORE_TO_STRING

249 void SkBlurImageFilter::toString(SkString* str) const {

250 str->appendf("SkBlurImageFilter: (");

251 str->appendf("sigma: (%f, %f) input (", fSigma.fWidth, fSigma.fHeight);

252

253 if (this->getInput(0)) {

254 this->getInput(0)->toString(str);

255 }

256

257 str->append("))");

258 }

259 #endif

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