static unsigned color_dist16(uint16_t a, uint16_t b) {
unsigned dr = SkAbs32(SkPacked16ToR32(a) - SkPacked16ToR32(b));
unsigned dg = SkAbs32(SkPacked16ToG32(a) - SkPacked16ToG32(b));
unsigned db = SkAbs32(SkPacked16ToB32(a) - SkPacked16ToB32(b));
return SkMax32(dr, SkMax32(dg, db));
}
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;
}
}
static void ToColor_S565(SkColor dst[], const void* src, int width,
SkColorTable*) {
SkASSERT(width > 0);
const uint16_t* s = (const uint16_t*)src;
do {
uint16_t c = *s++;
*dst++ = SkColorSetRGB(SkPacked16ToR32(c), SkPacked16ToG32(c),
SkPacked16ToB32(c));
} while (--width != 0);
}
static void RGB_565_To_RGB(const uint8_t* in, uint8_t* rgb, int width,
const SkPMColor*) {
const uint16_t* SK_RESTRICT src = (const uint16_t*)in;
for (int i = 0; i < width; ++i) {
const uint16_t c = *src++;
rgb[0] = SkPacked16ToR32(c);
rgb[1] = SkPacked16ToG32(c);
rgb[2] = SkPacked16ToB32(c);
rgb += 3;
}
}
void SkTransparentShader::shadeSpan(int x, int y, SkPMColor span[], int count) {
unsigned scale = SkAlpha255To256(fAlpha);
switch (fDevice->getConfig()) {
case SkBitmap::kARGB_8888_Config:
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 SkBitmap::kRGB_565_Config: {
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 = fAlpha;
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 SkBitmap::kARGB_4444_Config: {
const uint16_t* src = fDevice->getAddr16(x, y);
if (scale == 256) {
for (int i = count - 1; i >= 0; --i) {
span[i] = SkPixel4444ToPixel32(src[i]);
}
} else {
unsigned scale16 = scale >> 4;
for (int i = count - 1; i >= 0; --i) {
uint32_t c = SkExpand_4444(src[i]) * scale16;
span[i] = SkCompact_8888(c);
}
}
break;
}
case SkBitmap::kIndex8_Config:
SkDEBUGFAIL("index8 not supported as a destination device");
break;
case SkBitmap::kA8_Config: {
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;
}
case SkBitmap::kA1_Config:
SkDEBUGFAIL("kA1_Config umimplemented at this time");
break;
default: // to avoid warnings
break;
}
}
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();
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) {
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;
}
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");
}
}