9fa60daad4
Refactoring pattern: 1. guard the existing constructor(readbuffer) with the legacy build-flag 2. If you are a instancable subclass, implement CreateProc(readbuffer) to create a new instances from the buffer params (or return NULL). If you're a shader subclass 1. You must read/write the local matrix if your class accepts that in its factory/constructor, else ignore it. R=robertphillips@google.com, mtklein@google.com, senorblanco@google.com, senorblanco@chromium.org, sugoi@chromium.org Author: reed@google.com Review URL: https://codereview.chromium.org/395603002
131 lines
4.3 KiB
C++
131 lines
4.3 KiB
C++
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/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkTransparentShader.h"
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#include "SkColorPriv.h"
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#include "SkString.h"
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SkShader::Context* SkTransparentShader::onCreateContext(const ContextRec& rec,
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void* storage) const {
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return SkNEW_PLACEMENT_ARGS(storage, TransparentShaderContext, (*this, rec));
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}
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size_t SkTransparentShader::contextSize() const {
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return sizeof(TransparentShaderContext);
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}
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SkTransparentShader::TransparentShaderContext::TransparentShaderContext(
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const SkTransparentShader& shader, const ContextRec& rec)
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: INHERITED(shader, rec)
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, fDevice(rec.fDevice) {}
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SkTransparentShader::TransparentShaderContext::~TransparentShaderContext() {}
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uint32_t SkTransparentShader::TransparentShaderContext::getFlags() const {
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uint32_t flags = this->INHERITED::getFlags();
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switch (fDevice->colorType()) {
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case kRGB_565_SkColorType:
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flags |= kHasSpan16_Flag;
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if (this->getPaintAlpha() == 255)
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flags |= kOpaqueAlpha_Flag;
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break;
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case kN32_SkColorType:
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if (this->getPaintAlpha() == 255 && fDevice->isOpaque())
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flags |= kOpaqueAlpha_Flag;
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break;
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default:
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break;
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}
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return flags;
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}
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void SkTransparentShader::TransparentShaderContext::shadeSpan(int x, int y, SkPMColor span[],
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int count) {
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unsigned scale = SkAlpha255To256(this->getPaintAlpha());
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switch (fDevice->colorType()) {
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case kN32_SkColorType:
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if (scale == 256) {
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SkPMColor* src = fDevice->getAddr32(x, y);
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if (src != span) {
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memcpy(span, src, count * sizeof(SkPMColor));
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}
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} else {
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const SkPMColor* src = fDevice->getAddr32(x, y);
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for (int i = count - 1; i >= 0; --i) {
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span[i] = SkAlphaMulQ(src[i], scale);
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}
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}
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break;
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case kRGB_565_SkColorType: {
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const uint16_t* src = fDevice->getAddr16(x, y);
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if (scale == 256) {
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for (int i = count - 1; i >= 0; --i) {
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span[i] = SkPixel16ToPixel32(src[i]);
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}
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} else {
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unsigned alpha = this->getPaintAlpha();
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for (int i = count - 1; i >= 0; --i) {
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uint16_t c = src[i];
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unsigned r = SkPacked16ToR32(c);
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unsigned g = SkPacked16ToG32(c);
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unsigned b = SkPacked16ToB32(c);
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span[i] = SkPackARGB32( alpha,
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SkAlphaMul(r, scale),
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SkAlphaMul(g, scale),
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SkAlphaMul(b, scale));
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}
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}
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break;
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}
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case kAlpha_8_SkColorType: {
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const uint8_t* src = fDevice->getAddr8(x, y);
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if (scale == 256) {
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for (int i = count - 1; i >= 0; --i) {
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span[i] = SkPackARGB32(src[i], 0, 0, 0);
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}
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} else {
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for (int i = count - 1; i >= 0; --i) {
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span[i] = SkPackARGB32(SkAlphaMul(src[i], scale), 0, 0, 0);
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}
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}
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break;
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}
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default:
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SkDEBUGFAIL("colorType not supported as a destination device");
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break;
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}
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}
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void SkTransparentShader::TransparentShaderContext::shadeSpan16(int x, int y, uint16_t span[],
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int count) {
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SkASSERT(fDevice->colorType() == kRGB_565_SkColorType);
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uint16_t* src = fDevice->getAddr16(x, y);
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if (src != span) {
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memcpy(span, src, count << 1);
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}
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}
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SkFlattenable* SkTransparentShader::CreateProc(SkReadBuffer& buffer) {
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return SkNEW(SkTransparentShader);
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}
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#ifndef SK_IGNORE_TO_STRING
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void SkTransparentShader::toString(SkString* str) const {
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str->append("SkTransparentShader: (");
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this->INHERITED::toString(str);
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str->append(")");
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}
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#endif
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