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| 1 /* | |
| 2 * Copyright 2013 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 "SkBicubicImageFilter.h" | |
| 9 #include "SkBitmap.h" | |
| 10 #include "SkColorPriv.h" | |
| 11 #include "SkReadBuffer.h" | |
| 12 #include "SkWriteBuffer.h" | |
| 13 #include "SkMatrix.h" | |
| 14 #include "SkRect.h" | |
| 15 #include "SkUnPreMultiply.h" | |
| 16 | |
| 17 #if SK_SUPPORT_GPU | |
| 18 #include "effects/GrBicubicEffect.h" | |
| 19 #include "GrContext.h" | |
| 20 #include "GrTexture.h" | |
| 21 #endif | |
| 22 | |
| 23 #define DS(x) SkDoubleToScalar(x) | |
| 24 | |
| 25 static const SkScalar gMitchellCoefficients[16] = { | |
| 26 DS( 1.0 / 18.0), DS(-9.0 / 18.0), DS( 15.0 / 18.0), DS( -7.0 / 18.0), | |
| 27 DS(16.0 / 18.0), DS( 0.0 / 18.0), DS(-36.0 / 18.0), DS( 21.0 / 18.0), | |
| 28 DS( 1.0 / 18.0), DS( 9.0 / 18.0), DS( 27.0 / 18.0), DS(-21.0 / 18.0), | |
| 29 DS( 0.0 / 18.0), DS( 0.0 / 18.0), DS( -6.0 / 18.0), DS( 7.0 / 18.0), | |
| 30 }; | |
| 31 | |
| 32 SkBicubicImageFilter::SkBicubicImageFilter(const SkSize& scale, const SkScalar c
oefficients[16], SkImageFilter* input) | |
| 33 : INHERITED(input), | |
| 34 fScale(scale) { | |
| 35 memcpy(fCoefficients, coefficients, sizeof(fCoefficients)); | |
| 36 } | |
| 37 | |
| 38 SkBicubicImageFilter* SkBicubicImageFilter::CreateMitchell(const SkSize& scale, | |
| 39 SkImageFilter* input)
{ | |
| 40 return SkNEW_ARGS(SkBicubicImageFilter, (scale, gMitchellCoefficients, input
)); | |
| 41 } | |
| 42 | |
| 43 SkBicubicImageFilter::SkBicubicImageFilter(SkReadBuffer& buffer) | |
| 44 : INHERITED(1, buffer) { | |
| 45 SkDEBUGCODE(bool success =) buffer.readScalarArray(fCoefficients, 16); | |
| 46 SkASSERT(success); | |
| 47 fScale.fWidth = buffer.readScalar(); | |
| 48 fScale.fHeight = buffer.readScalar(); | |
| 49 buffer.validate(SkScalarIsFinite(fScale.fWidth) && | |
| 50 SkScalarIsFinite(fScale.fHeight) && | |
| 51 (fScale.fWidth >= 0) && | |
| 52 (fScale.fHeight >= 0)); | |
| 53 } | |
| 54 | |
| 55 void SkBicubicImageFilter::flatten(SkWriteBuffer& buffer) const { | |
| 56 this->INHERITED::flatten(buffer); | |
| 57 buffer.writeScalarArray(fCoefficients, 16); | |
| 58 buffer.writeScalar(fScale.fWidth); | |
| 59 buffer.writeScalar(fScale.fHeight); | |
| 60 } | |
| 61 | |
| 62 SkBicubicImageFilter::~SkBicubicImageFilter() { | |
| 63 } | |
| 64 | |
| 65 inline SkPMColor cubicBlend(const SkScalar c[16], SkScalar t, SkPMColor c0, SkPM
Color c1, SkPMColor c2, SkPMColor c3) { | |
| 66 SkScalar t2 = t * t, t3 = t2 * t; | |
| 67 SkScalar cc[4]; | |
| 68 // FIXME: For the fractx case, this should be refactored out of this functi
on. | |
| 69 cc[0] = c[0] + SkScalarMul(c[1], t) + SkScalarMul(c[2], t2) + SkScalarMul(c
[3], t3); | |
| 70 cc[1] = c[4] + SkScalarMul(c[5], t) + SkScalarMul(c[6], t2) + SkScalarMul(c
[7], t3); | |
| 71 cc[2] = c[8] + SkScalarMul(c[9], t) + SkScalarMul(c[10], t2) + SkScalarMul(
c[11], t3); | |
| 72 cc[3] = c[12] + SkScalarMul(c[13], t) + SkScalarMul(c[14], t2) + SkScalarMul
(c[15], t3); | |
| 73 SkScalar a = SkScalarClampMax(SkScalarMul(cc[0], SkGetPackedA32(c0)) + SkSca
larMul(cc[1], SkGetPackedA32(c1)) + SkScalarMul(cc[2], SkGetPackedA32(c2)) + SkS
calarMul(cc[3], SkGetPackedA32(c3)), 255); | |
| 74 SkScalar r = SkScalarMul(cc[0], SkGetPackedR32(c0)) + SkScalarMul(cc[1], SkG
etPackedR32(c1)) + SkScalarMul(cc[2], SkGetPackedR32(c2)) + SkScalarMul(cc[3], S
kGetPackedR32(c3)); | |
| 75 SkScalar g = SkScalarMul(cc[0], SkGetPackedG32(c0)) + SkScalarMul(cc[1], SkG
etPackedG32(c1)) + SkScalarMul(cc[2], SkGetPackedG32(c2)) + SkScalarMul(cc[3], S
kGetPackedG32(c3)); | |
| 76 SkScalar b = SkScalarMul(cc[0], SkGetPackedB32(c0)) + SkScalarMul(cc[1], SkG
etPackedB32(c1)) + SkScalarMul(cc[2], SkGetPackedB32(c2)) + SkScalarMul(cc[3], S
kGetPackedB32(c3)); | |
| 77 return SkPackARGB32(SkScalarRoundToInt(a), | |
| 78 SkScalarRoundToInt(SkScalarClampMax(r, a)), | |
| 79 SkScalarRoundToInt(SkScalarClampMax(g, a)), | |
| 80 SkScalarRoundToInt(SkScalarClampMax(b, a))); | |
| 81 } | |
| 82 | |
| 83 bool SkBicubicImageFilter::onFilterImage(Proxy* proxy, | |
| 84 const SkBitmap& source, | |
| 85 const Context& ctx, | |
| 86 SkBitmap* result, | |
| 87 SkIPoint* offset) const { | |
| 88 SkBitmap src = source; | |
| 89 SkIPoint srcOffset = SkIPoint::Make(0, 0); | |
| 90 if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcO
ffset)) { | |
| 91 return false; | |
| 92 } | |
| 93 | |
| 94 if (src.colorType() != kN32_SkColorType) { | |
| 95 return false; | |
| 96 } | |
| 97 | |
| 98 SkAutoLockPixels alp(src); | |
| 99 if (!src.getPixels()) { | |
| 100 return false; | |
| 101 } | |
| 102 | |
| 103 SkRect dstRect = SkRect::MakeWH(SkScalarMul(SkIntToScalar(src.width()), fSca
le.fWidth), | |
| 104 SkScalarMul(SkIntToScalar(src.height()), fSc
ale.fHeight)); | |
| 105 SkIRect dstIRect; | |
| 106 dstRect.roundOut(&dstIRect); | |
| 107 if (dstIRect.isEmpty()) { | |
| 108 return false; | |
| 109 } | |
| 110 if (!result->allocPixels(src.info().makeWH(dstIRect.width(), dstIRect.height
()))) { | |
| 111 return false; | |
| 112 } | |
| 113 | |
| 114 SkRect srcRect; | |
| 115 src.getBounds(&srcRect); | |
| 116 srcRect.offset(SkPoint::Make(SkIntToScalar(srcOffset.fX), SkIntToScalar(srcO
ffset.fY))); | |
| 117 SkMatrix inverse; | |
| 118 inverse.setRectToRect(dstRect, srcRect, SkMatrix::kFill_ScaleToFit); | |
| 119 inverse.postTranslate(-0.5f, -0.5f); | |
| 120 | |
| 121 for (int y = dstIRect.fTop; y < dstIRect.fBottom; ++y) { | |
| 122 SkPMColor* dptr = result->getAddr32(dstIRect.fLeft, y); | |
| 123 for (int x = dstIRect.fLeft; x < dstIRect.fRight; ++x) { | |
| 124 SkPoint srcPt, dstPt = SkPoint::Make(SkIntToScalar(x), SkIntToScalar
(y)); | |
| 125 inverse.mapPoints(&srcPt, &dstPt, 1); | |
| 126 SkScalar fractx = srcPt.fX - SkScalarFloorToScalar(srcPt.fX); | |
| 127 SkScalar fracty = srcPt.fY - SkScalarFloorToScalar(srcPt.fY); | |
| 128 int sx = SkScalarFloorToInt(srcPt.fX); | |
| 129 int sy = SkScalarFloorToInt(srcPt.fY); | |
| 130 int x0 = SkClampMax(sx - 1, src.width() - 1); | |
| 131 int x1 = SkClampMax(sx , src.width() - 1); | |
| 132 int x2 = SkClampMax(sx + 1, src.width() - 1); | |
| 133 int x3 = SkClampMax(sx + 2, src.width() - 1); | |
| 134 int y0 = SkClampMax(sy - 1, src.height() - 1); | |
| 135 int y1 = SkClampMax(sy , src.height() - 1); | |
| 136 int y2 = SkClampMax(sy + 1, src.height() - 1); | |
| 137 int y3 = SkClampMax(sy + 2, src.height() - 1); | |
| 138 SkPMColor s00 = *src.getAddr32(x0, y0); | |
| 139 SkPMColor s10 = *src.getAddr32(x1, y0); | |
| 140 SkPMColor s20 = *src.getAddr32(x2, y0); | |
| 141 SkPMColor s30 = *src.getAddr32(x3, y0); | |
| 142 SkPMColor s0 = cubicBlend(fCoefficients, fractx, s00, s10, s20, s30)
; | |
| 143 SkPMColor s01 = *src.getAddr32(x0, y1); | |
| 144 SkPMColor s11 = *src.getAddr32(x1, y1); | |
| 145 SkPMColor s21 = *src.getAddr32(x2, y1); | |
| 146 SkPMColor s31 = *src.getAddr32(x3, y1); | |
| 147 SkPMColor s1 = cubicBlend(fCoefficients, fractx, s01, s11, s21, s31)
; | |
| 148 SkPMColor s02 = *src.getAddr32(x0, y2); | |
| 149 SkPMColor s12 = *src.getAddr32(x1, y2); | |
| 150 SkPMColor s22 = *src.getAddr32(x2, y2); | |
| 151 SkPMColor s32 = *src.getAddr32(x3, y2); | |
| 152 SkPMColor s2 = cubicBlend(fCoefficients, fractx, s02, s12, s22, s32)
; | |
| 153 SkPMColor s03 = *src.getAddr32(x0, y3); | |
| 154 SkPMColor s13 = *src.getAddr32(x1, y3); | |
| 155 SkPMColor s23 = *src.getAddr32(x2, y3); | |
| 156 SkPMColor s33 = *src.getAddr32(x3, y3); | |
| 157 SkPMColor s3 = cubicBlend(fCoefficients, fractx, s03, s13, s23, s33)
; | |
| 158 *dptr++ = cubicBlend(fCoefficients, fracty, s0, s1, s2, s3); | |
| 159 } | |
| 160 } | |
| 161 offset->fX = dstIRect.fLeft; | |
| 162 offset->fY = dstIRect.fTop; | |
| 163 return true; | |
| 164 } | |
| 165 | |
| 166 /////////////////////////////////////////////////////////////////////////////// | |
| 167 | |
| 168 #if SK_SUPPORT_GPU | |
| 169 | |
| 170 bool SkBicubicImageFilter::filterImageGPU(Proxy* proxy, const SkBitmap& src, con
st Context& ctx, | |
| 171 SkBitmap* result, SkIPoint* offset) co
nst { | |
| 172 SkBitmap srcBM = src; | |
| 173 if (getInput(0) && !getInput(0)->getInputResultGPU(proxy, src, ctx, &srcBM,
offset)) { | |
| 174 return false; | |
| 175 } | |
| 176 GrTexture* srcTexture = srcBM.getTexture(); | |
| 177 GrContext* context = srcTexture->getContext(); | |
| 178 | |
| 179 SkRect dstRect = SkRect::MakeWH(srcBM.width() * fScale.fWidth, | |
| 180 srcBM.height() * fScale.fHeight); | |
| 181 | |
| 182 GrTextureDesc desc; | |
| 183 desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit; | |
| 184 desc.fWidth = SkScalarCeilToInt(dstRect.width()); | |
| 185 desc.fHeight = SkScalarCeilToInt(dstRect.height()); | |
| 186 desc.fConfig = kSkia8888_GrPixelConfig; | |
| 187 | |
| 188 GrAutoScratchTexture ast(context, desc); | |
| 189 SkAutoTUnref<GrTexture> dst(ast.detach()); | |
| 190 if (!dst) { | |
| 191 return false; | |
| 192 } | |
| 193 GrContext::AutoRenderTarget art(context, dst->asRenderTarget()); | |
| 194 GrPaint paint; | |
| 195 paint.addColorEffect(GrBicubicEffect::Create(srcTexture, fCoefficients))->un
ref(); | |
| 196 SkRect srcRect; | |
| 197 srcBM.getBounds(&srcRect); | |
| 198 context->drawRectToRect(paint, dstRect, srcRect); | |
| 199 WrapTexture(dst, desc.fWidth, desc.fHeight, result); | |
| 200 return true; | |
| 201 } | |
| 202 #endif | |
| 203 | |
| 204 /////////////////////////////////////////////////////////////////////////////// | |
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Chromium Code Reviews
Issue 357793002:
Remove SkBicubicImageFilter, and all related tests. (Closed)
Base URL: https://skia.googlesource.com/skia.git@master