/*
* Set an RLE pixel from R, G, B values
*/
void SkBmpRLECodec::setRGBPixel(void* dst, size_t dstRowBytes,
const SkImageInfo& dstInfo, uint32_t x,
uint32_t y, uint8_t red, uint8_t green,
uint8_t blue) {
// Set the row
int height = dstInfo.height();
int row;
if (SkBmpCodec::kBottomUp_RowOrder == this->rowOrder()) {
row = height - y - 1;
} else {
row = y;
}
// Set the pixel based on destination color type
switch (dstInfo.colorType()) {
case kN32_SkColorType: {
SkPMColor* dstRow = SkTAddOffset<SkPMColor>((SkPMColor*) dst,
row * (int) dstRowBytes);
dstRow[x] = SkPackARGB32NoCheck(0xFF, red, green, blue);
break;
}
case kRGB_565_SkColorType: {
uint16_t* dstRow = SkTAddOffset<uint16_t>(dst, row * (int) dstRowBytes);
dstRow[x] = SkPack888ToRGB16(red, green, blue);
break;
}
default:
// This case should not be reached. We should catch an invalid
// color type when we check that the conversion is possible.
SkASSERT(false);
break;
}
}
/*
* Set an RLE pixel from R, G, B values
*/
void SkBmpRLECodec::setRGBPixel(void* dst, size_t dstRowBytes,
const SkImageInfo& dstInfo, uint32_t x,
uint32_t y, uint8_t red, uint8_t green,
uint8_t blue) {
if (dst && is_coord_necessary(x, fSampleX, dstInfo.width())) {
// Set the row
uint32_t row = this->getDstRow(y, dstInfo.height());
// Set the pixel based on destination color type
const int dstX = get_dst_coord(x, fSampleX);
switch (dstInfo.colorType()) {
case kRGBA_8888_SkColorType: {
SkPMColor* dstRow = SkTAddOffset<SkPMColor>(dst, row * (int) dstRowBytes);
dstRow[dstX] = SkPackARGB_as_RGBA(0xFF, red, green, blue);
break;
}
case kBGRA_8888_SkColorType: {
SkPMColor* dstRow = SkTAddOffset<SkPMColor>(dst, row * (int) dstRowBytes);
dstRow[dstX] = SkPackARGB_as_BGRA(0xFF, red, green, blue);
break;
}
case kRGB_565_SkColorType: {
uint16_t* dstRow = SkTAddOffset<uint16_t>(dst, row * (int) dstRowBytes);
dstRow[dstX] = SkPack888ToRGB16(red, green, blue);
break;
}
default:
// This case should not be reached. We should catch an invalid
// color type when we check that the conversion is possible.
SkASSERT(false);
break;
}
}
}
SkColorShader::ColorShaderContext::ColorShaderContext(const SkColorShader& shader,
const ContextRec& rec)
: INHERITED(shader, rec)
{
SkColor color = shader.fColor;
unsigned a = SkAlphaMul(SkColorGetA(color), SkAlpha255To256(rec.fPaint->getAlpha()));
unsigned r = SkColorGetR(color);
unsigned g = SkColorGetG(color);
unsigned b = SkColorGetB(color);
// we want this before we apply any alpha
fColor16 = SkPack888ToRGB16(r, g, b);
if (a != 255) {
r = SkMulDiv255Round(r, a);
g = SkMulDiv255Round(g, a);
b = SkMulDiv255Round(b, a);
}
fPMColor = SkPackARGB32(a, r, g, b);
fFlags = kConstInY32_Flag;
if (255 == a) {
fFlags |= kOpaqueAlpha_Flag;
if (rec.fPaint->isDither() == false) {
fFlags |= kHasSpan16_Flag;
}
}
}
bool SkColorShader::setContext(const SkBitmap& device, const SkPaint& paint,
const SkMatrix& matrix) {
if (!this->INHERITED::setContext(device, paint, matrix)) {
return false;
}
SkColor c;
unsigned a;
if (fInheritColor) {
c = paint.getColor();
a = SkColorGetA(c);
} else {
c = fColor;
a = SkAlphaMul(SkColorGetA(c), SkAlpha255To256(paint.getAlpha()));
}
unsigned r = SkColorGetR(c);
unsigned g = SkColorGetG(c);
unsigned b = SkColorGetB(c);
// we want this before we apply any alpha
fColor16 = SkPack888ToRGB16(r, g, b);
if (a != 255) {
a = SkAlpha255To256(a);
r = SkAlphaMul(r, a);
g = SkAlphaMul(g, a);
b = SkAlphaMul(b, a);
}
fPMColor = SkPackARGB32(a, r, g, b);
return true;
}
static uint16_t packTriple(U8CPU r, U8CPU g, U8CPU b) {
#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
r = SkTMax(r, (U8CPU)0x40);
g = SkTMax(g, (U8CPU)0x40);
b = SkTMax(b, (U8CPU)0x40);
#endif
return SkPack888ToRGB16(r, g, b);
}
void SkPowerMode::xfer16(uint16_t dst[], const SkPMColor src[], int count,
const SkAlpha aa[]) {
for (int i = 0; i < count; i++) {
SkPMColor c = src[i];
int r = SkGetPackedR32(c);
int g = SkGetPackedG32(c);
int b = SkGetPackedB32(c);
r = fTable[r];
g = fTable[g];
b = fTable[b];
dst[i] = SkPack888ToRGB16(r, g, b);
}
}
static SkSwizzler::ResultAlpha swizzle_mask24_to_565(
void* dstRow, const uint8_t* srcRow, int width, SkMasks* masks) {
// Use the masks to decode to the destination
uint16_t* dstPtr = (uint16_t*) dstRow;
for (int i = 0; i < 3*width; i += 3) {
uint32_t p = srcRow[i] | (srcRow[i + 1] << 8) | srcRow[i + 2] << 16;
uint8_t red = masks->getRed(p);
uint8_t green = masks->getGreen(p);
uint8_t blue = masks->getBlue(p);
dstPtr[i/3] = SkPack888ToRGB16(red, green, blue);
}
return SkSwizzler::kOpaque_ResultAlpha;
}
static inline bool S32A_D565_Blend_02(SkPMColor sc, uint16_t dc, U8CPU alpha) {
unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha);
unsigned dr = SkMulS16(SkGetPackedR32(sc), alpha) + SkMulS16(GetPackedR16As32(dc), dst_scale);
unsigned dg = SkMulS16(SkGetPackedG32(sc), alpha) + SkMulS16(GetPackedG16As32(dc), dst_scale);
unsigned db = SkMulS16(SkGetPackedB32(sc), alpha) + SkMulS16(GetPackedB16As32(dc), dst_scale);
int rc = SkPack888ToRGB16(SkDiv255Round(dr),
SkDiv255Round(dg),
SkDiv255Round(db));
unsigned rr = SkGetPackedR16(rc);
unsigned rg = SkGetPackedG16(rc);
if (rr <= 31 && rg <= 63) {
return true;
}
return false;
}
bool SkColorShader::setContext(const SkBitmap& device, const SkPaint& paint,
const SkMatrix& matrix) {
if (!this->INHERITED::setContext(device, paint, matrix)) {
return false;
}
SkColor c;
unsigned a;
if (fInheritColor) {
c = paint.getColor();
a = SkColorGetA(c);
} else {
c = fColor;
a = SkAlphaMul(SkColorGetA(c), SkAlpha255To256(paint.getAlpha()));
}
unsigned r = SkColorGetR(c);
unsigned g = SkColorGetG(c);
unsigned b = SkColorGetB(c);
// we want this before we apply any alpha
fColor16 = SkPack888ToRGB16(r, g, b);
if (a != 255) {
r = SkMulDiv255Round(r, a);
g = SkMulDiv255Round(g, a);
b = SkMulDiv255Round(b, a);
}
fPMColor = SkPackARGB32(a, r, g, b);
fFlags = kConstInY32_Flag;
if (255 == a) {
fFlags |= kOpaqueAlpha_Flag;
if (paint.isDither() == false) {
fFlags |= kHasSpan16_Flag;
}
}
return true;
}
static void pack3xHToLCD16(const SkBitmap& src, const SkMask& dst,
const SkMaskGamma::PreBlend& maskPreBlend) {
SkASSERT(SkBitmap::kA8_Config == src.config());
SkASSERT(SkMask::kLCD16_Format == dst.fFormat);
const int width = dst.fBounds.width();
const int height = dst.fBounds.height();
uint16_t* dstP = (uint16_t*)dst.fImage;
size_t dstRB = dst.fRowBytes;
for (int y = 0; y < height; ++y) {
const uint8_t* srcP = src.getAddr8(0, y);
for (int x = 0; x < width; ++x) {
U8CPU r = sk_apply_lut_if<APPLY_PREBLEND>(*srcP++, maskPreBlend.fR);
U8CPU g = sk_apply_lut_if<APPLY_PREBLEND>(*srcP++, maskPreBlend.fG);
U8CPU b = sk_apply_lut_if<APPLY_PREBLEND>(*srcP++, maskPreBlend.fB);
dstP[x] = SkPack888ToRGB16(r, g, b);
}
dstP = (uint16_t*)((char*)dstP + dstRB);
}
}
static void pack4xHToLCD16(const SkPixmap& src, const SkMask& dst,
const SkMaskGamma::PreBlend& maskPreBlend) {
#define SAMPLES_PER_PIXEL 4
#define LCD_PER_PIXEL 3
SkASSERT(kAlpha_8_SkColorType == src.colorType());
SkASSERT(SkMask::kLCD16_Format == dst.fFormat);
const int sample_width = src.width();
const int height = src.height();
uint16_t* dstP = (uint16_t*)dst.fImage;
size_t dstRB = dst.fRowBytes;
// An N tap FIR is defined by
// out[n] = coeff[0]*x[n] + coeff[1]*x[n-1] + ... + coeff[N]*x[n-N]
// or
// out[n] = sum(i, 0, N, coeff[i]*x[n-i])
// The strategy is to use one FIR (different coefficients) for each of r, g, and b.
// This means using every 4th FIR output value of each FIR and discarding the rest.
// The FIRs are aligned, and the coefficients reach 5 samples to each side of their 'center'.
// (For r and b this is technically incorrect, but the coeffs outside round to zero anyway.)
// These are in some fixed point repesentation.
// Adding up to more than one simulates ink spread.
// For implementation reasons, these should never add up to more than two.
// Coefficients determined by a gausian where 5 samples = 3 std deviations (0x110 'contrast').
// Calculated using tools/generate_fir_coeff.py
// With this one almost no fringing is ever seen, but it is imperceptibly blurry.
// The lcd smoothed text is almost imperceptibly different from gray,
// but is still sharper on small stems and small rounded corners than gray.
// This also seems to be about as wide as one can get and only have a three pixel kernel.
// TODO: caculate these at runtime so parameters can be adjusted (esp contrast).
static const unsigned int coefficients[LCD_PER_PIXEL][SAMPLES_PER_PIXEL*3] = {
//The red subpixel is centered inside the first sample (at 1/6 pixel), and is shifted.
{ 0x03, 0x0b, 0x1c, 0x33, 0x40, 0x39, 0x24, 0x10, 0x05, 0x01, 0x00, 0x00, },
//The green subpixel is centered between two samples (at 1/2 pixel), so is symetric
{ 0x00, 0x02, 0x08, 0x16, 0x2b, 0x3d, 0x3d, 0x2b, 0x16, 0x08, 0x02, 0x00, },
//The blue subpixel is centered inside the last sample (at 5/6 pixel), and is shifted.
{ 0x00, 0x00, 0x01, 0x05, 0x10, 0x24, 0x39, 0x40, 0x33, 0x1c, 0x0b, 0x03, },
};
for (int y = 0; y < height; ++y) {
const uint8_t* srcP = src.addr8(0, y);
// TODO: this fir filter implementation is straight forward, but slow.
// It should be possible to make it much faster.
for (int sample_x = -4, pixel_x = 0; sample_x < sample_width + 4; sample_x += 4, ++pixel_x) {
int fir[LCD_PER_PIXEL] = { 0 };
for (int sample_index = SkMax32(0, sample_x - 4), coeff_index = sample_index - (sample_x - 4)
; sample_index < SkMin32(sample_x + 8, sample_width)
; ++sample_index, ++coeff_index)
{
int sample_value = srcP[sample_index];
for (int subpxl_index = 0; subpxl_index < LCD_PER_PIXEL; ++subpxl_index) {
fir[subpxl_index] += coefficients[subpxl_index][coeff_index] * sample_value;
}
}
for (int subpxl_index = 0; subpxl_index < LCD_PER_PIXEL; ++subpxl_index) {
fir[subpxl_index] /= 0x100;
fir[subpxl_index] = SkMin32(fir[subpxl_index], 255);
}
U8CPU r = sk_apply_lut_if<APPLY_PREBLEND>(fir[0], maskPreBlend.fR);
U8CPU g = sk_apply_lut_if<APPLY_PREBLEND>(fir[1], maskPreBlend.fG);
U8CPU b = sk_apply_lut_if<APPLY_PREBLEND>(fir[2], maskPreBlend.fB);
#if SK_SHOW_TEXT_BLIT_COVERAGE
r = SkMax32(r, 10); g = SkMax32(g, 10); b = SkMax32(b, 10);
#endif
dstP[pixel_x] = SkPack888ToRGB16(r, g, b);
}
dstP = (uint16_t*)((char*)dstP + dstRB);
}
}
static uint16_t grayToRGB16(U8CPU gray) {
#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
gray = SkTMax(gray, (U8CPU)0x40);
#endif
return SkPack888ToRGB16(gray, gray, gray);
}