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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkTransparentShader.h"
#include "SkColorPriv.h"
#include "SkString.h"
SkShader::Context* SkTransparentShader::createContext(const SkBitmap& device,
const SkPaint& paint,
const SkMatrix& matrix,
void* storage) const {
if (!this->validContext(device, paint, matrix)) {
return NULL;
}
return SkNEW_PLACEMENT_ARGS(storage, TransparentShaderContext, (*this, device, paint, matrix));
}
size_t SkTransparentShader::contextSize() const {
return sizeof(TransparentShaderContext);
}
SkTransparentShader::TransparentShaderContext::TransparentShaderContext(
const SkTransparentShader& shader, const SkBitmap& device,
const SkPaint& paint, const SkMatrix& matrix)
: INHERITED(shader, device, paint, matrix)
, fDevice(&device) {}
SkTransparentShader::TransparentShaderContext::~TransparentShaderContext() {}
uint32_t SkTransparentShader::TransparentShaderContext::getFlags() const {
uint32_t flags = this->INHERITED::getFlags();
switch (fDevice->colorType()) {
case kRGB_565_SkColorType:
flags |= kHasSpan16_Flag;
if (this->getPaintAlpha() == 255)
flags |= kOpaqueAlpha_Flag;
break;
case kN32_SkColorType:
if (this->getPaintAlpha() == 255 && fDevice->isOpaque())
flags |= kOpaqueAlpha_Flag;
break;
default:
break;
}
return flags;
}
void SkTransparentShader::TransparentShaderContext::shadeSpan(int x, int y, SkPMColor span[],
int count) {
unsigned scale = SkAlpha255To256(this->getPaintAlpha());
switch (fDevice->colorType()) {
case kN32_SkColorType:
if (scale == 256) {
SkPMColor* src = fDevice->getAddr32(x, y);
if (src != span) {
memcpy(span, src, count * sizeof(SkPMColor));
}
} else {
const SkPMColor* src = fDevice->getAddr32(x, y);
for (int i = count - 1; i >= 0; --i) {
span[i] = SkAlphaMulQ(src[i], scale);
}
}
break;
case kRGB_565_SkColorType: {
const uint16_t* src = fDevice->getAddr16(x, y);
if (scale == 256) {
for (int i = count - 1; i >= 0; --i) {
span[i] = SkPixel16ToPixel32(src[i]);
}
} else {
unsigned alpha = this->getPaintAlpha();
for (int i = count - 1; i >= 0; --i) {
uint16_t c = src[i];
unsigned r = SkPacked16ToR32(c);
unsigned g = SkPacked16ToG32(c);
unsigned b = SkPacked16ToB32(c);
span[i] = SkPackARGB32( alpha,
SkAlphaMul(r, scale),
SkAlphaMul(g, scale),
SkAlphaMul(b, scale));
}
}
break;
}
case kAlpha_8_SkColorType: {
const uint8_t* src = fDevice->getAddr8(x, y);
if (scale == 256) {
for (int i = count - 1; i >= 0; --i) {
span[i] = SkPackARGB32(src[i], 0, 0, 0);
}
} else {
for (int i = count - 1; i >= 0; --i) {
span[i] = SkPackARGB32(SkAlphaMul(src[i], scale), 0, 0, 0);
}
}
break;
}
default:
SkDEBUGFAIL("colorType not supported as a destination device");
break;
}
}
void SkTransparentShader::TransparentShaderContext::shadeSpan16(int x, int y, uint16_t span[],
int count) {
SkASSERT(fDevice->colorType() == kRGB_565_SkColorType);
uint16_t* src = fDevice->getAddr16(x, y);
if (src != span) {
memcpy(span, src, count << 1);
}
}
#ifndef SK_IGNORE_TO_STRING
void SkTransparentShader::toString(SkString* str) const {
str->append("SkTransparentShader: (");
this->INHERITED::toString(str);
str->append(")");
}
#endif
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