void SkAvoidXfermode::xfer32(SkPMColor dst[], const SkPMColor src[], int count,
const SkAlpha aa[]) const {
unsigned opR = SkColorGetR(fOpColor);
unsigned opG = SkColorGetG(fOpColor);
unsigned opB = SkColorGetB(fOpColor);
uint32_t mul = fDistMul;
uint32_t sub = (fDistMul - (1 << 14)) << 8;
int MAX, mask;
if (kTargetColor_Mode == fMode) {
mask = -1;
MAX = 255;
} else {
mask = 0;
MAX = 0;
}
for (int i = 0; i < count; i++) {
int d = color_dist32(dst[i], opR, opG, opB);
// now reverse d if we need to
d = MAX + (d ^ mask) - mask;
SkASSERT((unsigned)d <= 255);
d = Accurate255To256(d);
d = scale_dist_14(d, mul, sub);
SkASSERT(d <= 256);
if (d > 0) {
if (aa) {
d = SkAlphaMul(d, Accurate255To256(*aa++));
if (0 == d) {
continue;
}
}
dst[i] = SkFourByteInterp256(src[i], dst[i], d);
}
}
}
/**
* Copies a FT_Bitmap into an SkMask with the same dimensions.
*
* Yes, No, Never Requested, Never Produced
*
* kBW kA8 k3D kARGB32 kLCD16
* FT_PIXEL_MODE_MONO Y Y NR N Y
* FT_PIXEL_MODE_GRAY N Y NR N Y
* FT_PIXEL_MODE_GRAY2 NP NP NR NP NP
* FT_PIXEL_MODE_GRAY4 NP NP NR NP NP
* FT_PIXEL_MODE_LCD NP NP NR NP NP
* FT_PIXEL_MODE_LCD_V NP NP NR NP NP
* FT_PIXEL_MODE_BGRA N N NR Y N
*
* TODO: All of these N need to be Y or otherwise ruled out.
*/
static void copyFTBitmap(const FT_Bitmap& srcFTBitmap, SkMask& dstMask) {
SkASSERTF(dstMask.fBounds.width() == static_cast<int>(srcFTBitmap.width),
"dstMask.fBounds.width() = %d\n"
"static_cast<int>(srcFTBitmap.width) = %d",
dstMask.fBounds.width(),
static_cast<int>(srcFTBitmap.width)
);
SkASSERTF(dstMask.fBounds.height() == static_cast<int>(srcFTBitmap.rows),
"dstMask.fBounds.height() = %d\n"
"static_cast<int>(srcFTBitmap.rows) = %d",
dstMask.fBounds.height(),
static_cast<int>(srcFTBitmap.rows)
);
const uint8_t* src = reinterpret_cast<const uint8_t*>(srcFTBitmap.buffer);
const FT_Pixel_Mode srcFormat = static_cast<FT_Pixel_Mode>(srcFTBitmap.pixel_mode);
// FT_Bitmap::pitch is an int and allowed to be negative.
const int srcPitch = srcFTBitmap.pitch;
const size_t srcRowBytes = SkTAbs(srcPitch);
uint8_t* dst = dstMask.fImage;
const SkMask::Format dstFormat = static_cast<SkMask::Format>(dstMask.fFormat);
const size_t dstRowBytes = dstMask.fRowBytes;
const size_t width = srcFTBitmap.width;
const size_t height = srcFTBitmap.rows;
if (SkMask::kLCD16_Format == dstFormat) {
copyFT2LCD16<false>(srcFTBitmap, dstMask, false, nullptr, nullptr, nullptr);
return;
}
if ((FT_PIXEL_MODE_MONO == srcFormat && SkMask::kBW_Format == dstFormat) ||
(FT_PIXEL_MODE_GRAY == srcFormat && SkMask::kA8_Format == dstFormat))
{
size_t commonRowBytes = SkTMin(srcRowBytes, dstRowBytes);
for (size_t y = height; y --> 0;) {
memcpy(dst, src, commonRowBytes);
src += srcPitch;
dst += dstRowBytes;
}
} else if (FT_PIXEL_MODE_MONO == srcFormat && SkMask::kA8_Format == dstFormat) {
for (size_t y = height; y --> 0;) {
uint8_t byte = 0;
int bits = 0;
const uint8_t* src_row = src;
uint8_t* dst_row = dst;
for (size_t x = width; x --> 0;) {
if (0 == bits) {
byte = *src_row++;
bits = 8;
}
*dst_row++ = byte & 0x80 ? 0xff : 0x00;
bits--;
byte <<= 1;
}
src += srcPitch;
dst += dstRowBytes;
}
} else if (FT_PIXEL_MODE_BGRA == srcFormat && SkMask::kARGB32_Format == dstFormat) {
// FT_PIXEL_MODE_BGRA is pre-multiplied.
for (size_t y = height; y --> 0;) {
const uint8_t* src_row = src;
SkPMColor* dst_row = reinterpret_cast<SkPMColor*>(dst);
for (size_t x = 0; x < width; ++x) {
uint8_t b = *src_row++;
uint8_t g = *src_row++;
uint8_t r = *src_row++;
uint8_t a = *src_row++;
*dst_row++ = SkPackARGB32(a, r, g, b);
#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
*(dst_row-1) = SkFourByteInterp256(*(dst_row-1), SK_ColorWHITE, 0x40);
#endif
}
src += srcPitch;
dst += dstRowBytes;
}
} else {
SkDEBUGF(("FT_Pixel_Mode %d, SkMask::Format %d\n", srcFormat, dstFormat));
SkDEBUGFAIL("unsupported combination of FT_Pixel_Mode and SkMask::Format");
}
}
