// unpremultiply and extract R, G, B components.
static void pmcolor_to_rgb24(uint32_t color, uint8_t* rgb, SkColorType ct) {
uint32_t s = SkUnPreMultiply::GetScale(SkGetA32Component(color, ct));
rgb[0] = SkUnPreMultiply::ApplyScale(s, SkGetR32Component(color, ct));
rgb[1] = SkUnPreMultiply::ApplyScale(s, SkGetG32Component(color, ct));
rgb[2] = SkUnPreMultiply::ApplyScale(s, SkGetB32Component(color, ct));
}
static void bitmap_to_pdf_pixels(const SkBitmap& bitmap, SkWStream* out) {
if (!bitmap.getPixels()) {
size_t size = pixel_count(bitmap) *
pdf_color_component_count(bitmap.colorType());
fill_stream(out, '\x00', size);
return;
}
SkBitmap copy;
const SkBitmap& bm = not4444(bitmap, ©);
SkAutoLockPixels autoLockPixels(bm);
SkColorType colorType = bm.colorType();
SkAlphaType alphaType = bm.alphaType();
switch (colorType) {
case kRGBA_8888_SkColorType:
case kBGRA_8888_SkColorType: {
SkASSERT(3 == pdf_color_component_count(colorType));
SkAutoTMalloc<uint8_t> scanline(3 * bm.width());
for (int y = 0; y < bm.height(); ++y) {
const uint32_t* src = bm.getAddr32(0, y);
uint8_t* dst = scanline.get();
for (int x = 0; x < bm.width(); ++x) {
if (alphaType == kPremul_SkAlphaType) {
uint32_t color = *src++;
U8CPU alpha = SkGetA32Component(color, colorType);
if (alpha != SK_AlphaTRANSPARENT) {
pmcolor_to_rgb24(color, dst, colorType);
} else {
get_neighbor_avg_color(bm, x, y, dst, colorType);
}
dst += 3;
} else {
uint32_t color = *src++;
*dst++ = SkGetR32Component(color, colorType);
*dst++ = SkGetG32Component(color, colorType);
*dst++ = SkGetB32Component(color, colorType);
}
}
out->write(scanline.get(), 3 * bm.width());
}
return;
}
case kRGB_565_SkColorType: {
SkASSERT(3 == pdf_color_component_count(colorType));
SkAutoTMalloc<uint8_t> scanline(3 * bm.width());
for (int y = 0; y < bm.height(); ++y) {
const uint16_t* src = bm.getAddr16(0, y);
uint8_t* dst = scanline.get();
for (int x = 0; x < bm.width(); ++x) {
U16CPU color565 = *src++;
*dst++ = SkPacked16ToR32(color565);
*dst++ = SkPacked16ToG32(color565);
*dst++ = SkPacked16ToB32(color565);
}
out->write(scanline.get(), 3 * bm.width());
}
return;
}
case kAlpha_8_SkColorType:
SkASSERT(1 == pdf_color_component_count(colorType));
fill_stream(out, '\x00', pixel_count(bm));
return;
case kGray_8_SkColorType:
case kIndex_8_SkColorType:
SkASSERT(1 == pdf_color_component_count(colorType));
// these two formats need no transformation to serialize.
for (int y = 0; y < bm.height(); ++y) {
out->write(bm.getAddr8(0, y), bm.width());
}
return;
case kUnknown_SkColorType:
case kARGB_4444_SkColorType:
default:
SkDEBUGFAIL("unexpected color type");
}
}
