commit-bot@chromium.org | c5d9bb0 | 2014-04-08 15:19:34 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2014 Google Inc. |
| 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 "SkPictureShader.h" |
| 9 | |
| 10 | #include "SkBitmap.h" |
| 11 | #include "SkBitmapProcShader.h" |
| 12 | #include "SkCanvas.h" |
| 13 | #include "SkMatrixUtils.h" |
| 14 | #include "SkPicture.h" |
| 15 | #include "SkReadBuffer.h" |
| 16 | |
| 17 | #if SK_SUPPORT_GPU |
| 18 | #include "GrContext.h" |
| 19 | #endif |
| 20 | |
| 21 | SkPictureShader::SkPictureShader(SkPicture* picture, TileMode tmx, TileMode tmy) |
| 22 | : fPicture(picture) |
| 23 | , fTmx(tmx) |
| 24 | , fTmy(tmy) { |
| 25 | SkSafeRef(fPicture); |
| 26 | } |
| 27 | |
| 28 | SkPictureShader::SkPictureShader(SkReadBuffer& buffer) |
| 29 | : INHERITED(buffer) { |
| 30 | fTmx = static_cast<SkShader::TileMode>(buffer.read32()); |
| 31 | fTmy = static_cast<SkShader::TileMode>(buffer.read32()); |
| 32 | if (buffer.readBool()) { |
| 33 | fPicture = SkPicture::CreateFromBuffer(buffer); |
| 34 | } else { |
| 35 | fPicture = NULL; |
| 36 | } |
| 37 | } |
| 38 | |
| 39 | SkPictureShader::~SkPictureShader() { |
| 40 | SkSafeUnref(fPicture); |
| 41 | } |
| 42 | |
| 43 | SkPictureShader* SkPictureShader::Create(SkPicture* picture, TileMode tmx, TileMode tmy) { |
| 44 | return SkNEW_ARGS(SkPictureShader, (picture, tmx, tmy)); |
| 45 | } |
| 46 | |
| 47 | void SkPictureShader::flatten(SkWriteBuffer& buffer) const { |
| 48 | this->INHERITED::flatten(buffer); |
| 49 | |
| 50 | buffer.write32(fTmx); |
| 51 | buffer.write32(fTmy); |
| 52 | buffer.writeBool(NULL != fPicture); |
| 53 | if (fPicture) { |
| 54 | fPicture->flatten(buffer); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | bool SkPictureShader::buildBitmapShader(const SkMatrix& matrix) const { |
| 59 | if (!fPicture || (0 == fPicture->width() && 0 == fPicture->height())) { |
| 60 | return false; |
| 61 | } |
| 62 | |
| 63 | SkMatrix m; |
| 64 | if (this->hasLocalMatrix()) { |
| 65 | m.setConcat(matrix, this->getLocalMatrix()); |
| 66 | } else { |
| 67 | m = matrix; |
| 68 | } |
| 69 | |
| 70 | // Use a rotation-invariant scale |
| 71 | SkPoint scale; |
| 72 | if (!SkDecomposeUpper2x2(m, NULL, &scale, NULL)) { |
| 73 | // Decomposition failed, use an approximation. |
| 74 | scale.set(SkScalarSqrt(m.getScaleX() * m.getScaleX() + m.getSkewX() * m.getSkewX()), |
| 75 | SkScalarSqrt(m.getScaleY() * m.getScaleY() + m.getSkewY() * m.getSkewY())); |
| 76 | } |
| 77 | SkSize scaledSize = SkSize::Make(scale.x() * fPicture->width(), scale.y() * fPicture->height()); |
| 78 | |
| 79 | SkISize tileSize = scaledSize.toRound(); |
| 80 | if (tileSize.isEmpty()) { |
| 81 | return false; |
| 82 | } |
| 83 | |
| 84 | // The actual scale, compensating for rounding. |
| 85 | SkSize tileScale = SkSize::Make(SkIntToScalar(tileSize.width()) / fPicture->width(), |
| 86 | SkIntToScalar(tileSize.height()) / fPicture->height()); |
| 87 | |
| 88 | if (!fCachedShader || tileScale != fCachedTileScale) { |
| 89 | SkBitmap bm; |
| 90 | if (!bm.allocN32Pixels(tileSize.width(), tileSize.height())) { |
| 91 | return false; |
| 92 | } |
| 93 | bm.eraseColor(SK_ColorTRANSPARENT); |
| 94 | |
| 95 | SkCanvas canvas(bm); |
| 96 | canvas.scale(tileScale.width(), tileScale.height()); |
| 97 | canvas.drawPicture(*fPicture); |
| 98 | |
| 99 | fCachedShader.reset(CreateBitmapShader(bm, fTmx, fTmy)); |
| 100 | fCachedTileScale = tileScale; |
| 101 | } |
| 102 | |
| 103 | SkMatrix shaderMatrix = this->getLocalMatrix(); |
| 104 | shaderMatrix.preScale(1 / tileScale.width(), 1 / tileScale.height()); |
| 105 | fCachedShader->setLocalMatrix(shaderMatrix); |
| 106 | |
| 107 | return true; |
| 108 | } |
| 109 | |
| 110 | bool SkPictureShader::setContext(const SkBitmap& device, |
| 111 | const SkPaint& paint, |
| 112 | const SkMatrix& matrix) { |
| 113 | if (!this->buildBitmapShader(matrix)) { |
| 114 | return false; |
| 115 | } |
| 116 | |
| 117 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
| 118 | return false; |
| 119 | } |
| 120 | |
| 121 | SkASSERT(fCachedShader); |
| 122 | if (!fCachedShader->setContext(device, paint, matrix)) { |
| 123 | this->INHERITED::endContext(); |
| 124 | return false; |
| 125 | } |
| 126 | |
| 127 | return true; |
| 128 | } |
| 129 | |
| 130 | void SkPictureShader::endContext() { |
| 131 | SkASSERT(fCachedShader); |
| 132 | fCachedShader->endContext(); |
| 133 | |
| 134 | this->INHERITED::endContext(); |
| 135 | } |
| 136 | |
| 137 | uint32_t SkPictureShader::getFlags() { |
| 138 | if (NULL != fCachedShader) { |
| 139 | return fCachedShader->getFlags(); |
| 140 | } |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | SkShader::ShadeProc SkPictureShader::asAShadeProc(void** ctx) { |
| 145 | if (fCachedShader) { |
| 146 | return fCachedShader->asAShadeProc(ctx); |
| 147 | } |
| 148 | return NULL; |
| 149 | } |
| 150 | |
| 151 | void SkPictureShader::shadeSpan(int x, int y, SkPMColor dstC[], int count) { |
| 152 | SkASSERT(fCachedShader); |
| 153 | fCachedShader->shadeSpan(x, y, dstC, count); |
| 154 | } |
| 155 | |
| 156 | void SkPictureShader::shadeSpan16(int x, int y, uint16_t dstC[], int count) { |
| 157 | SkASSERT(fCachedShader); |
| 158 | fCachedShader->shadeSpan16(x, y, dstC, count); |
| 159 | } |
| 160 | |
| 161 | #ifndef SK_IGNORE_TO_STRING |
| 162 | void SkPictureShader::toString(SkString* str) const { |
| 163 | static const char* gTileModeName[SkShader::kTileModeCount] = { |
| 164 | "clamp", "repeat", "mirror" |
| 165 | }; |
| 166 | |
| 167 | str->appendf("PictureShader: [%d:%d] ", |
| 168 | fPicture ? fPicture->width() : 0, |
| 169 | fPicture ? fPicture->height() : 0); |
| 170 | |
| 171 | str->appendf("(%s, %s)", gTileModeName[fTmx], gTileModeName[fTmy]); |
| 172 | |
| 173 | this->INHERITED::toString(str); |
| 174 | } |
| 175 | #endif |
| 176 | |
| 177 | #if SK_SUPPORT_GPU |
| 178 | GrEffectRef* SkPictureShader::asNewEffect(GrContext* context, const SkPaint& paint) const { |
| 179 | if (!this->buildBitmapShader(context->getMatrix())) { |
| 180 | return NULL; |
| 181 | } |
| 182 | SkASSERT(fCachedShader); |
| 183 | return fCachedShader->asNewEffect(context, paint); |
| 184 | } |
| 185 | #endif |