1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/effects/SkTransparentShader.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,117 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2006 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#include "SkTransparentShader.h"
1.14 +#include "SkColorPriv.h"
1.15 +#include "SkString.h"
1.16 +
1.17 +bool SkTransparentShader::setContext(const SkBitmap& device,
1.18 + const SkPaint& paint,
1.19 + const SkMatrix& matrix) {
1.20 + fDevice = &device;
1.21 + fAlpha = paint.getAlpha();
1.22 +
1.23 + return this->INHERITED::setContext(device, paint, matrix);
1.24 +}
1.25 +
1.26 +uint32_t SkTransparentShader::getFlags() {
1.27 + uint32_t flags = this->INHERITED::getFlags();
1.28 +
1.29 + switch (fDevice->colorType()) {
1.30 + case kRGB_565_SkColorType:
1.31 + flags |= kHasSpan16_Flag;
1.32 + if (fAlpha == 255)
1.33 + flags |= kOpaqueAlpha_Flag;
1.34 + break;
1.35 + case kPMColor_SkColorType:
1.36 + if (fAlpha == 255 && fDevice->isOpaque())
1.37 + flags |= kOpaqueAlpha_Flag;
1.38 + break;
1.39 + default:
1.40 + break;
1.41 + }
1.42 + return flags;
1.43 +}
1.44 +
1.45 +void SkTransparentShader::shadeSpan(int x, int y, SkPMColor span[], int count) {
1.46 + unsigned scale = SkAlpha255To256(fAlpha);
1.47 +
1.48 + switch (fDevice->colorType()) {
1.49 + case kPMColor_SkColorType:
1.50 + if (scale == 256) {
1.51 + SkPMColor* src = fDevice->getAddr32(x, y);
1.52 + if (src != span) {
1.53 + memcpy(span, src, count * sizeof(SkPMColor));
1.54 + }
1.55 + } else {
1.56 + const SkPMColor* src = fDevice->getAddr32(x, y);
1.57 + for (int i = count - 1; i >= 0; --i) {
1.58 + span[i] = SkAlphaMulQ(src[i], scale);
1.59 + }
1.60 + }
1.61 + break;
1.62 + case kRGB_565_SkColorType: {
1.63 + const uint16_t* src = fDevice->getAddr16(x, y);
1.64 + if (scale == 256) {
1.65 + for (int i = count - 1; i >= 0; --i) {
1.66 + span[i] = SkPixel16ToPixel32(src[i]);
1.67 + }
1.68 + } else {
1.69 + unsigned alpha = fAlpha;
1.70 + for (int i = count - 1; i >= 0; --i) {
1.71 + uint16_t c = src[i];
1.72 + unsigned r = SkPacked16ToR32(c);
1.73 + unsigned g = SkPacked16ToG32(c);
1.74 + unsigned b = SkPacked16ToB32(c);
1.75 +
1.76 + span[i] = SkPackARGB32( alpha,
1.77 + SkAlphaMul(r, scale),
1.78 + SkAlphaMul(g, scale),
1.79 + SkAlphaMul(b, scale));
1.80 + }
1.81 + }
1.82 + break;
1.83 + }
1.84 + case kAlpha_8_SkColorType: {
1.85 + const uint8_t* src = fDevice->getAddr8(x, y);
1.86 + if (scale == 256) {
1.87 + for (int i = count - 1; i >= 0; --i) {
1.88 + span[i] = SkPackARGB32(src[i], 0, 0, 0);
1.89 + }
1.90 + } else {
1.91 + for (int i = count - 1; i >= 0; --i) {
1.92 + span[i] = SkPackARGB32(SkAlphaMul(src[i], scale), 0, 0, 0);
1.93 + }
1.94 + }
1.95 + break;
1.96 + }
1.97 + default:
1.98 + SkDEBUGFAIL("colorType not supported as a destination device");
1.99 + break;
1.100 + }
1.101 +}
1.102 +
1.103 +void SkTransparentShader::shadeSpan16(int x, int y, uint16_t span[], int count) {
1.104 + SkASSERT(fDevice->colorType() == kRGB_565_SkColorType);
1.105 +
1.106 + uint16_t* src = fDevice->getAddr16(x, y);
1.107 + if (src != span) {
1.108 + memcpy(span, src, count << 1);
1.109 + }
1.110 +}
1.111 +
1.112 +#ifndef SK_IGNORE_TO_STRING
1.113 +void SkTransparentShader::toString(SkString* str) const {
1.114 + str->append("SkTransparentShader: (");
1.115 +
1.116 + this->INHERITED::toString(str);
1.117 +
1.118 + str->append(")");
1.119 +}
1.120 +#endif
