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- /*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "src/shaders/SkBitmapProcShader.h"
- #include "src/core/SkArenaAlloc.h"
- #include "src/core/SkBitmapProcState.h"
- #include "src/core/SkBitmapProvider.h"
- #include "src/core/SkXfermodePriv.h"
- static bool only_scale_and_translate(const SkMatrix& matrix) {
- unsigned mask = SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask;
- return (matrix.getType() & ~mask) == 0;
- }
- class BitmapProcInfoContext : public SkShaderBase::Context {
- public:
- // The info has been allocated elsewhere, but we are responsible for calling its destructor.
- BitmapProcInfoContext(const SkShaderBase& shader, const SkShaderBase::ContextRec& rec,
- SkBitmapProcInfo* info)
- : INHERITED(shader, rec)
- , fInfo(info)
- {
- fFlags = 0;
- if (fInfo->fPixmap.isOpaque() && (255 == this->getPaintAlpha())) {
- fFlags |= SkShaderBase::kOpaqueAlpha_Flag;
- }
- if (1 == fInfo->fPixmap.height() && only_scale_and_translate(this->getTotalInverse())) {
- fFlags |= SkShaderBase::kConstInY32_Flag;
- }
- }
- uint32_t getFlags() const override { return fFlags; }
- private:
- SkBitmapProcInfo* fInfo;
- uint32_t fFlags;
- typedef SkShaderBase::Context INHERITED;
- };
- ///////////////////////////////////////////////////////////////////////////////////////////////////
- class BitmapProcShaderContext : public BitmapProcInfoContext {
- public:
- BitmapProcShaderContext(const SkShaderBase& shader, const SkShaderBase::ContextRec& rec,
- SkBitmapProcState* state)
- : INHERITED(shader, rec, state)
- , fState(state)
- {}
- void shadeSpan(int x, int y, SkPMColor dstC[], int count) override {
- const SkBitmapProcState& state = *fState;
- if (state.getShaderProc32()) {
- state.getShaderProc32()(&state, x, y, dstC, count);
- return;
- }
- const int BUF_MAX = 128;
- uint32_t buffer[BUF_MAX];
- SkBitmapProcState::MatrixProc mproc = state.getMatrixProc();
- SkBitmapProcState::SampleProc32 sproc = state.getSampleProc32();
- const int max = state.maxCountForBufferSize(sizeof(buffer[0]) * BUF_MAX);
- SkASSERT(state.fPixmap.addr());
- for (;;) {
- int n = SkTMin(count, max);
- SkASSERT(n > 0 && n < BUF_MAX*2);
- mproc(state, buffer, n, x, y);
- sproc(state, buffer, n, dstC);
- if ((count -= n) == 0) {
- break;
- }
- SkASSERT(count > 0);
- x += n;
- dstC += n;
- }
- }
- private:
- SkBitmapProcState* fState;
- typedef BitmapProcInfoContext INHERITED;
- };
- ///////////////////////////////////////////////////////////////////////////////////////////////////
- SkShaderBase::Context* SkBitmapProcLegacyShader::MakeContext(
- const SkShaderBase& shader, SkTileMode tmx, SkTileMode tmy,
- const SkBitmapProvider& provider, const ContextRec& rec, SkArenaAlloc* alloc)
- {
- SkMatrix totalInverse;
- // Do this first, so we know the matrix can be inverted.
- if (!shader.computeTotalInverse(*rec.fMatrix, rec.fLocalMatrix, &totalInverse)) {
- return nullptr;
- }
- SkBitmapProcState* state = alloc->make<SkBitmapProcState>(provider, tmx, tmy);
- if (!state->setup(totalInverse, *rec.fPaint)) {
- return nullptr;
- }
- return alloc->make<BitmapProcShaderContext>(shader, rec, state);
- }
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