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Diffstat (limited to 'skia/effects/SkShaderExtras.cpp')
| -rw-r--r-- | skia/effects/SkShaderExtras.cpp | 174 |
1 files changed, 0 insertions, 174 deletions
diff --git a/skia/effects/SkShaderExtras.cpp b/skia/effects/SkShaderExtras.cpp deleted file mode 100644 index 84a1647..0000000 --- a/skia/effects/SkShaderExtras.cpp +++ /dev/null @@ -1,174 +0,0 @@ -/* libs/graphics/effects/SkShaderExtras.cpp -** -** Copyright 2006, The Android Open Source Project -** -** Licensed under the Apache License, Version 2.0 (the "License"); -** you may not use this file except in compliance with the License. -** You may obtain a copy of the License at -** -** http://www.apache.org/licenses/LICENSE-2.0 -** -** Unless required by applicable law or agreed to in writing, software -** distributed under the License is distributed on an "AS IS" BASIS, -** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -** See the License for the specific language governing permissions and -** limitations under the License. -*/ - -#include "SkShaderExtras.h" -#include "SkColorFilter.h" -#include "SkColorPriv.h" -#include "SkXfermode.h" - -////////////////////////////////////////////////////////////////////////////////////// - -SkComposeShader::SkComposeShader(SkShader* sA, SkShader* sB, SkXfermode* mode) -{ - fShaderA = sA; sA->ref(); - fShaderB = sB; sB->ref(); - // mode may be null - fMode = mode; mode->safeRef(); -} - -SkComposeShader::SkComposeShader(SkFlattenableReadBuffer& buffer) : - INHERITED(buffer) -{ - fShaderA = static_cast<SkShader*>(buffer.readFlattenable()); - fShaderB = static_cast<SkShader*>(buffer.readFlattenable()); - fMode = static_cast<SkXfermode*>(buffer.readFlattenable()); -} - -SkComposeShader::~SkComposeShader() -{ - fMode->safeUnref(); // may be null - fShaderB->unref(); - fShaderA->unref(); -} - -void SkComposeShader::beginSession() -{ - this->INHERITED::beginSession(); - fShaderA->beginSession(); - fShaderB->beginSession(); -} - -void SkComposeShader::endSession() -{ - fShaderA->endSession(); - fShaderB->endSession(); - this->INHERITED::endSession(); -} - -class SkAutoAlphaRestore { -public: - SkAutoAlphaRestore(SkPaint* paint, uint8_t newAlpha) - { - fAlpha = paint->getAlpha(); - fPaint = paint; - paint->setAlpha(newAlpha); - } - ~SkAutoAlphaRestore() - { - fPaint->setAlpha(fAlpha); - } -private: - SkPaint* fPaint; - uint8_t fAlpha; -}; - -void SkComposeShader::flatten(SkFlattenableWriteBuffer& buffer) -{ - this->INHERITED::flatten(buffer); - buffer.writeFlattenable(fShaderA); - buffer.writeFlattenable(fShaderB); - buffer.writeFlattenable(fMode); -} - -/* We call setContext on our two worker shaders. However, we - always let them see opaque alpha, and if the paint really - is translucent, then we apply that after the fact. -*/ -bool SkComposeShader::setContext(const SkBitmap& device, - const SkPaint& paint, - const SkMatrix& matrix) -{ - if (!this->INHERITED::setContext(device, paint, matrix)) - return false; - - // we preconcat our localMatrix (if any) with the device matrix - // before calling our sub-shaders - - SkMatrix tmpM; - - (void)this->getLocalMatrix(&tmpM); - tmpM.setConcat(matrix, tmpM); - - SkAutoAlphaRestore restore(const_cast<SkPaint*>(&paint), 0xFF); - - return fShaderA->setContext(device, paint, tmpM) && - fShaderB->setContext(device, paint, tmpM); -} - -// larger is better (fewer times we have to loop), but we shouldn't -// take up too much stack-space (each element is 4 bytes) -#define TMP_COLOR_COUNT 64 - -void SkComposeShader::shadeSpan(int x, int y, SkPMColor result[], int count) -{ - SkShader* shaderA = fShaderA; - SkShader* shaderB = fShaderB; - SkXfermode* mode = fMode; - unsigned scale = SkAlpha255To256(this->getPaintAlpha()); - - SkPMColor tmp[TMP_COLOR_COUNT]; - - if (NULL == mode) // implied SRC_OVER - { - do { - int n = count; - if (n > TMP_COLOR_COUNT) - n = TMP_COLOR_COUNT; - - shaderA->shadeSpan(x, y, result, n); - shaderB->shadeSpan(x, y, tmp, n); - - if (256 == scale) - { - for (int i = 0; i < n; i++) - result[i] = SkPMSrcOver(tmp[i], result[i]); - } - else - { - for (int i = 0; i < n; i++) - result[i] = SkAlphaMulQ(SkPMSrcOver(tmp[i], result[i]), scale); - } - - result += n; - x += n; - count -= n; - } while (count > 0); - } - else // use mode for the composition - { - do { - int n = count; - if (n > TMP_COLOR_COUNT) - n = TMP_COLOR_COUNT; - - shaderA->shadeSpan(x, y, result, n); - shaderB->shadeSpan(x, y, tmp, n); - mode->xfer32(result, tmp, n, NULL); - - if (256 == scale) - { - for (int i = 0; i < n; i++) - result[i] = SkAlphaMulQ(result[i], scale); - } - - result += n; - x += n; - count -= n; - } while (count > 0); - } -} - |