// Make either A8 or gray8 bitmap.
static SkBitmap make_bitmap(SkColorType ct) {
SkBitmap bm;
switch (ct) {
case kAlpha_8_SkColorType:
bm.allocPixels(SkImageInfo::MakeA8(SCALE, SCALE));
break;
case kGray_8_SkColorType:
bm.allocPixels(
SkImageInfo::Make(SCALE, SCALE, ct, kOpaque_SkAlphaType));
break;
default:
SkASSERT(false);
return bm;
}
SkAutoLockPixels autoLockPixels(bm);
uint8_t spectrum[256];
for (int y = 0; y < 256; ++y) {
spectrum[y] = y;
}
for (int y = 0; y < 128; ++y) {
// Shift over one byte each scanline.
memcpy(bm.getAddr8(0, y), &spectrum[y], 128);
}
bm.setImmutable();
return bm;
}
static SkBitmap make_bitmap()
{
SkBitmap bm;
SkColorTable* ctable = new SkColorTable(256);
SkPMColor* c = ctable->lockColors();
for (int i = 0; i < 256; i++)
{
c[i] = SkPackARGB32(0xFF, i, 0, 0);
}
ctable->unlockColors(true);
bm.setConfig(SkBitmap::kIndex8_Config, 256, 32);
bm.allocPixels(ctable);
ctable->unref();
bm.lockPixels();
for (int y = 0; y < bm.height(); y++)
{
uint8_t* p = bm.getAddr8(0, y);
for (int x = 0; x < 256; x++)
{
p[x] = x;
}
}
bm.unlockPixels();
return bm;
}
static SkBitmap make_bitmap() {
SkBitmap bm;
SkColorTable* ctable = new SkColorTable(256);
SkPMColor* c = ctable->lockColors();
for (int i = 0; i < 256; i++) {
c[i] = SkPackARGB32(255 - i, 0, 0, 0);
}
ctable->unlockColors(true);
bm.setConfig(SkBitmap::kIndex8_Config, 256, 256);
bm.allocPixels(ctable);
ctable->unref();
bm.lockPixels();
const float cx = bm.width() * 0.5f;
const float cy = bm.height() * 0.5f;
for (int y = 0; y < bm.height(); y++) {
float dy = y - cy;
dy *= dy;
uint8_t* p = bm.getAddr8(0, y);
for (int x = 0; x < 256; x++) {
float dx = x - cx;
dx *= dx;
float d = (dx + dy) / (cx/2);
int id = (int)d;
if (id > 255) {
id = 255;
}
p[x] = id;
}
}
bm.unlockPixels();
return bm;
}
static SkBitmap make_bitmap() {
SkPMColor c[256];
for (int i = 0; i < 256; i++) {
c[i] = SkPackARGB32(255 - i, 0, 0, 0);
}
SkBitmap bm;
SkColorTable* ctable = new SkColorTable(c, 256);
bm.allocPixels(SkImageInfo::Make(256, 256, kIndex_8_SkColorType,
kPremul_SkAlphaType),
nullptr, ctable);
ctable->unref();
bm.lockPixels();
const float cx = bm.width() * 0.5f;
const float cy = bm.height() * 0.5f;
for (int y = 0; y < bm.height(); y++) {
float dy = y - cy;
dy *= dy;
uint8_t* p = bm.getAddr8(0, y);
for (int x = 0; x < 256; x++) {
float dx = x - cx;
dx *= dx;
float d = (dx + dy) / (cx/2);
int id = (int)d;
if (id > 255) {
id = 255;
}
p[x] = id;
}
}
bm.unlockPixels();
return bm;
}
// https://bug.skia.org/4390
DEF_TEST(ImageFromIndex8Bitmap, r) {
SkPMColor pmColors[1] = {SkPreMultiplyColor(SK_ColorWHITE)};
SkBitmap bm;
SkAutoTUnref<SkColorTable> ctable(
new SkColorTable(pmColors, SK_ARRAY_COUNT(pmColors)));
SkImageInfo info =
SkImageInfo::Make(1, 1, kIndex_8_SkColorType, kPremul_SkAlphaType);
bm.allocPixels(info, nullptr, ctable);
SkAutoLockPixels autoLockPixels(bm);
*bm.getAddr8(0, 0) = 0;
SkAutoTUnref<SkImage> img(SkImage::NewFromBitmap(bm));
REPORTER_ASSERT(r, img.get() != nullptr);
}
static SkBitmap make_bitmap() {
const SkPMColor c[] = { SkPackARGB32(0x80, 0x80, 0, 0) };
SkColorTable* ctable = new SkColorTable(c, SK_ARRAY_COUNT(c));
SkBitmap bm;
bm.allocPixels(SkImageInfo::Make(1, 1, kIndex_8_SkColorType,
kPremul_SkAlphaType),
NULL, ctable);
ctable->unref();
bm.lockPixels();
*bm.getAddr8(0, 0) = 0;
bm.unlockPixels();
return bm;
}
static SkBitmap make_bitmap() {
SkBitmap bm;
SkColorTable* ctable = new SkColorTable(1);
SkPMColor* c = ctable->lockColors();
c[0] = SkPackARGB32(0x80, 0x80, 0, 0);
ctable->unlockColors(true);
bm.setConfig(SkBitmap::kIndex8_Config, 1, 1);
bm.allocPixels(ctable);
ctable->unref();
bm.lockPixels();
*bm.getAddr8(0, 0) = 0;
bm.unlockPixels();
return bm;
}
static void copyToLCD16(const SkBitmap& src, const SkMask& dst) {
SkASSERT(SkBitmap::kA8_Config == src.config());
SkASSERT(SkMask::kLCD16_Format == dst.fFormat);
const int width = dst.fBounds.width();
const int height = dst.fBounds.height();
const uint8_t* srcP = src.getAddr8(0, 0);
size_t srcRB = src.rowBytes();
uint16_t* dstP = (uint16_t*)dst.fImage;
size_t dstRB = dst.fRowBytes;
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
dstP[x] = a8_to_rgb565(srcP[x]);
}
srcP += srcRB;
dstP = (uint16_t*)((char*)dstP + dstRB);
}
}
static void pack3xHToLCD16(const SkBitmap& src, const SkMask& dst) {
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) {
unsigned r = *srcP++;
unsigned g = *srcP++;
unsigned b = *srcP++;
dstP[x] = packLCD16(r, g, b);
}
dstP = (uint16_t*)((char*)dstP + dstRB);
}
}
static void pack3xHToLCD32(const SkBitmap& src, const SkMask& dst,
const SkMaskGamma::PreBlend& maskPreBlend) {
SkASSERT(SkBitmap::kA8_Config == src.config());
SkASSERT(SkMask::kLCD32_Format == dst.fFormat);
const int width = dst.fBounds.width();
const int height = dst.fBounds.height();
SkPMColor* dstP = (SkPMColor*)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] = SkPackARGB32(0xFF, r, g, b);
}
dstP = (SkPMColor*)((char*)dstP + dstRB);
}
}
void drawBG(SkCanvas* canvas)
{
canvas->drawColor(0xFFDDDDDD);
return;
#if 0
SkColorTable ct;
SkPMColor colors[] = { SK_ColorRED, SK_ColorBLUE };
ct.setColors(colors, 2);
ct.setFlags(ct.getFlags() | SkColorTable::kColorsAreOpaque_Flag);
SkBitmap bm;
bm.setConfig(SkBitmap::kIndex8_Config, 20, 20, 21);
bm.setColorTable(&ct);
bm.allocPixels();
sk_memset16((uint16_t*)bm.getAddr8(0, 0), 0x0001, bm.rowBytes() * bm.height() / 2);
#endif
#if 0
SkBitmap bm;
bm.setConfig(SkBitmap::kRGB_565_Config, 20, 20, 42);
bm.allocPixels();
sk_memset32((uint32_t*)bm.getAddr16(0, 0), 0x0000FFFF, bm.rowBytes() * bm.height() / 4);
#endif
#if 1
SkBitmap bm;
bm.setConfig(SkBitmap::kARGB_8888_Config, 20, 20);
bm.allocPixels();
sk_memset32((uint32_t*)bm.getAddr32(0, 0), 0xFFDDDDDD, bm.rowBytes() * bm.height() / 4);
#endif
SkPaint paint;
// SkShader* shader = SkShader::CreateBitmapShader(bm, false, SkPaint::kBilinear_FilterType, SkShader::kRepeat_TileMode);
SkPoint pts[] = { 0, 0, SkIntToScalar(100), SkIntToScalar(0) };
SkColor colors[] = { SK_ColorBLACK, SK_ColorWHITE };
SkShader* shader = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kMirror_TileMode);
paint.setShader(shader)->unref();
canvas->drawPaint(paint);
}
static SkBitmap make_bitmap() {
SkPMColor c[256];
for (int i = 0; i < 256; i++) {
c[i] = SkPackARGB32(0xFF, i, 0, 0);
}
SkColorTable* ctable = new SkColorTable(c, 256);
SkBitmap bm;
bm.allocPixels(SkImageInfo::Make(256, 32, kIndex_8_SkColorType, kPremul_SkAlphaType),
nullptr, ctable);
ctable->unref();
bm.lockPixels();
for (int y = 0; y < bm.height(); y++) {
uint8_t* p = bm.getAddr8(0, y);
for (int x = 0; x < 256; x++) {
p[x] = x;
}
}
bm.unlockPixels();
return bm;
}
static SkBitmap indexed_bitmap() {
SkBitmap n32bitmap;
n32bitmap.allocN32Pixels(SCALE, SCALE);
n32bitmap.eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(n32bitmap);
color_wheel_native(&canvas);
const SkColor colors[] = {
SK_ColorTRANSPARENT,
SK_ColorWHITE,
SK_ColorBLACK,
SK_ColorRED,
SK_ColorGREEN,
SK_ColorBLUE,
SK_ColorCYAN,
SK_ColorMAGENTA,
SK_ColorYELLOW,
};
SkPMColor pmColors[SK_ARRAY_COUNT(colors)];
for (size_t i = 0; i < SK_ARRAY_COUNT(colors); ++i) {
pmColors[i] = premultiply_color(colors[i]);
}
SkBitmap bm;
SkAutoTUnref<SkColorTable> ctable(new SkColorTable(pmColors, SK_ARRAY_COUNT(pmColors)));
SkImageInfo info = SkImageInfo::Make(SCALE, SCALE, kIndex_8_SkColorType,
kPremul_SkAlphaType);
bm.allocPixels(info, nullptr, ctable);
SkAutoLockPixels autoLockPixels1(n32bitmap);
SkAutoLockPixels autoLockPixels2(bm);
for (int y = 0; y < SCALE; ++y) {
for (int x = 0; x < SCALE; ++x) {
SkPMColor c = *n32bitmap.getAddr32(x, y);
int idx = find(pmColors, SK_ARRAY_COUNT(pmColors), c);
*bm.getAddr8(x, y) = SkClampMax(idx, SK_ARRAY_COUNT(pmColors) - 1);
}
}
return bm;
}
static bool getColor(const SkBitmap& bitmap, int x, int y, SkColor* c) {
switch (bitmap.getConfig()) {
case SkBitmap::kARGB_8888_Config:
*c = SkUnPreMultiply::PMColorToColor(*bitmap.getAddr32(x, y));
break;
case SkBitmap::kRGB_565_Config:
*c = SkPixel16ToPixel32(*bitmap.getAddr16(x, y));
break;
case SkBitmap::kARGB_4444_Config:
*c = SkUnPreMultiply::PMColorToColor(
SkPixel4444ToPixel32(*bitmap.getAddr16(x, y)));
break;
case SkBitmap::kIndex8_Config: {
SkColorTable* ctable = bitmap.getColorTable();
*c = SkUnPreMultiply::PMColorToColor(
(*ctable)[*bitmap.getAddr8(x, y)]);
break;
}
default:
return false;
}
return true;
}
static SkBitmap make_bitmap() {
const int N = 1;
SkPMColor c[N];
for (int i = 0; i < N; i++) {
c[i] = SkPackARGB32(0x80, 0x80, 0, 0);
}
SkColorTable* ctable = new SkColorTable(c, N);
SkBitmap bm;
bm.setConfig(SkBitmap::kIndex8_Config, 1, 1);
bm.allocPixels(ctable);
ctable->unref();
bm.lockPixels();
for (int y = 0; y < bm.height(); y++) {
uint8_t* p = bm.getAddr8(0, y);
for (int x = 0; x < bm.width(); x++) {
p[x] = 0;
}
}
bm.unlockPixels();
return bm;
}
void SkScalerContext_FreeType_Base::generateGlyphImage(FT_Face face, const SkGlyph& glyph) {
const bool doBGR = SkToBool(fRec.fFlags & SkScalerContext::kLCD_BGROrder_Flag);
const bool doVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag);
switch ( face->glyph->format ) {
case FT_GLYPH_FORMAT_OUTLINE: {
FT_Outline* outline = &face->glyph->outline;
FT_BBox bbox;
FT_Bitmap target;
if (fRec.fFlags & SkScalerContext::kEmbolden_Flag &&
!(face->style_flags & FT_STYLE_FLAG_BOLD)) {
emboldenOutline(face, outline);
}
int dx = 0, dy = 0;
if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) {
dx = SkFixedToFDot6(glyph.getSubXFixed());
dy = SkFixedToFDot6(glyph.getSubYFixed());
// negate dy since freetype-y-goes-up and skia-y-goes-down
dy = -dy;
}
FT_Outline_Get_CBox(outline, &bbox);
/*
what we really want to do for subpixel is
offset(dx, dy)
compute_bounds
offset(bbox & !63)
but that is two calls to offset, so we do the following, which
achieves the same thing with only one offset call.
*/
FT_Outline_Translate(outline, dx - ((bbox.xMin + dx) & ~63),
dy - ((bbox.yMin + dy) & ~63));
if (SkMask::kLCD16_Format == glyph.fMaskFormat) {
FT_Render_Glyph(face->glyph, doVert ? FT_RENDER_MODE_LCD_V : FT_RENDER_MODE_LCD);
SkMask mask;
glyph.toMask(&mask);
if (fPreBlend.isApplicable()) {
copyFT2LCD16<true>(face->glyph->bitmap, mask, doBGR,
fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
} else {
copyFT2LCD16<false>(face->glyph->bitmap, mask, doBGR,
fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
}
} else {
target.width = glyph.fWidth;
target.rows = glyph.fHeight;
target.pitch = glyph.rowBytes();
target.buffer = reinterpret_cast<uint8_t*>(glyph.fImage);
target.pixel_mode = compute_pixel_mode( (SkMask::Format)fRec.fMaskFormat);
target.num_grays = 256;
memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
FT_Outline_Get_Bitmap(face->glyph->library, outline, &target);
}
} break;
case FT_GLYPH_FORMAT_BITMAP: {
FT_Pixel_Mode pixel_mode = static_cast<FT_Pixel_Mode>(face->glyph->bitmap.pixel_mode);
SkMask::Format maskFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
// Assume that the other formats do not exist.
SkASSERT(FT_PIXEL_MODE_MONO == pixel_mode ||
FT_PIXEL_MODE_GRAY == pixel_mode ||
FT_PIXEL_MODE_BGRA == pixel_mode);
// These are the only formats this ScalerContext should request.
SkASSERT(SkMask::kBW_Format == maskFormat ||
SkMask::kA8_Format == maskFormat ||
SkMask::kARGB32_Format == maskFormat ||
SkMask::kLCD16_Format == maskFormat);
if (fRec.fFlags & SkScalerContext::kEmbolden_Flag &&
!(face->style_flags & FT_STYLE_FLAG_BOLD))
{
FT_GlyphSlot_Own_Bitmap(face->glyph);
FT_Bitmap_Embolden(face->glyph->library, &face->glyph->bitmap,
kBitmapEmboldenStrength, 0);
}
// If no scaling needed, directly copy glyph bitmap.
if (glyph.fWidth == face->glyph->bitmap.width &&
glyph.fHeight == face->glyph->bitmap.rows &&
glyph.fTop == -face->glyph->bitmap_top &&
glyph.fLeft == face->glyph->bitmap_left)
{
SkMask dstMask;
glyph.toMask(&dstMask);
copyFTBitmap(face->glyph->bitmap, dstMask);
break;
}
// Otherwise, scale the bitmap.
// Copy the FT_Bitmap into an SkBitmap (either A8 or ARGB)
SkBitmap unscaledBitmap;
unscaledBitmap.setConfig(SkBitmapConfig_for_FTPixelMode(pixel_mode),
face->glyph->bitmap.width, face->glyph->bitmap.rows);
unscaledBitmap.allocPixels();
SkMask unscaledBitmapAlias;
unscaledBitmapAlias.fImage = reinterpret_cast<uint8_t*>(unscaledBitmap.getPixels());
unscaledBitmapAlias.fBounds.set(0, 0, unscaledBitmap.width(), unscaledBitmap.height());
unscaledBitmapAlias.fRowBytes = unscaledBitmap.rowBytes();
unscaledBitmapAlias.fFormat = SkMaskFormat_for_SkBitmapConfig(unscaledBitmap.config());
copyFTBitmap(face->glyph->bitmap, unscaledBitmapAlias);
// Wrap the glyph's mask in a bitmap, unless the glyph's mask is BW or LCD.
// BW requires an A8 target for resizing, which can then be down sampled.
// LCD should use a 4x A8 target, which will then be down sampled.
// For simplicity, LCD uses A8 and is replicated.
int bitmapRowBytes = 0;
if (SkMask::kBW_Format != maskFormat && SkMask::kLCD16_Format != maskFormat) {
bitmapRowBytes = glyph.rowBytes();
}
SkBitmap dstBitmap;
dstBitmap.setConfig(SkBitmapConfig_for_SkMaskFormat(maskFormat),
glyph.fWidth, glyph.fHeight, bitmapRowBytes);
if (SkMask::kBW_Format == maskFormat || SkMask::kLCD16_Format == maskFormat) {
dstBitmap.allocPixels();
} else {
dstBitmap.setPixels(glyph.fImage);
}
// Scale unscaledBitmap into dstBitmap.
SkCanvas canvas(dstBitmap);
canvas.clear(SK_ColorTRANSPARENT);
canvas.scale(SkIntToScalar(glyph.fWidth) / SkIntToScalar(face->glyph->bitmap.width),
SkIntToScalar(glyph.fHeight) / SkIntToScalar(face->glyph->bitmap.rows));
SkPaint paint;
paint.setFilterLevel(SkPaint::kLow_FilterLevel);
canvas.drawBitmap(unscaledBitmap, 0, 0, &paint);
// If the destination is BW or LCD, convert from A8.
if (SkMask::kBW_Format == maskFormat) {
// Copy the A8 dstBitmap into the A1 glyph.fImage.
SkMask dstMask;
glyph.toMask(&dstMask);
packA8ToA1(dstMask, dstBitmap.getAddr8(0, 0), dstBitmap.rowBytes());
} else if (SkMask::kLCD16_Format == maskFormat) {
// Copy the A8 dstBitmap into the LCD16 glyph.fImage.
uint8_t* src = dstBitmap.getAddr8(0, 0);
uint16_t* dst = reinterpret_cast<uint16_t*>(glyph.fImage);
for (int y = dstBitmap.height(); y --> 0;) {
for (int x = 0; x < dstBitmap.width(); ++x) {
dst[x] = grayToRGB16(src[x]);
}
dst = (uint16_t*)((char*)dst + glyph.rowBytes());
src += dstBitmap.rowBytes();
}
}
} break;
default:
SkDEBUGFAIL("unknown glyph format");
memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
return;
}
// We used to always do this pre-USE_COLOR_LUMINANCE, but with colorlum,
// it is optional
#if defined(SK_GAMMA_APPLY_TO_A8)
if (SkMask::kA8_Format == glyph.fMaskFormat && fPreBlend.isApplicable()) {
uint8_t* SK_RESTRICT dst = (uint8_t*)glyph.fImage;
unsigned rowBytes = glyph.rowBytes();
for (int y = glyph.fHeight - 1; y >= 0; --y) {
for (int x = glyph.fWidth - 1; x >= 0; --x) {
dst[x] = fPreBlend.fG[dst[x]];
}
dst += rowBytes;
}
}
#endif
}
static void pack4xHToLCD16(const SkBitmap& 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.getAddr8(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 void generateMask(const SkMask& mask, const SkPath& path,
const SkMaskGamma::PreBlend& maskPreBlend) {
SkPaint paint;
int srcW = mask.fBounds.width();
int srcH = mask.fBounds.height();
int dstW = srcW;
int dstH = srcH;
int dstRB = mask.fRowBytes;
SkMatrix matrix;
matrix.setTranslate(-SkIntToScalar(mask.fBounds.fLeft),
-SkIntToScalar(mask.fBounds.fTop));
paint.setAntiAlias(SkMask::kBW_Format != mask.fFormat);
switch (mask.fFormat) {
case SkMask::kBW_Format:
dstRB = 0; // signals we need a copy
break;
case SkMask::kA8_Format:
break;
case SkMask::kLCD16_Format:
case SkMask::kLCD32_Format:
// TODO: trigger off LCD orientation
dstW = 4*dstW - 8;
matrix.setTranslate(-SkIntToScalar(mask.fBounds.fLeft + 1),
-SkIntToScalar(mask.fBounds.fTop));
matrix.postScale(SkIntToScalar(4), SK_Scalar1);
dstRB = 0; // signals we need a copy
break;
default:
SkDEBUGFAIL("unexpected mask format");
}
SkRasterClip clip;
clip.setRect(SkIRect::MakeWH(dstW, dstH));
const SkImageInfo info = SkImageInfo::MakeA8(dstW, dstH);
SkBitmap bm;
if (0 == dstRB) {
if (!bm.tryAllocPixels(info)) {
// can't allocate offscreen, so empty the mask and return
sk_bzero(mask.fImage, mask.computeImageSize());
return;
}
} else {
bm.installPixels(info, mask.fImage, dstRB);
}
sk_bzero(bm.getPixels(), bm.getSafeSize());
SkDraw draw;
draw.fRC = &clip;
draw.fClip = &clip.bwRgn();
draw.fMatrix = &matrix;
draw.fBitmap = &bm;
draw.drawPath(path, paint);
switch (mask.fFormat) {
case SkMask::kBW_Format:
packA8ToA1(mask, bm.getAddr8(0, 0), bm.rowBytes());
break;
case SkMask::kA8_Format:
if (maskPreBlend.isApplicable()) {
applyLUTToA8Mask(mask, maskPreBlend.fG);
}
break;
case SkMask::kLCD16_Format:
if (maskPreBlend.isApplicable()) {
pack4xHToLCD16<true>(bm, mask, maskPreBlend);
} else {
pack4xHToLCD16<false>(bm, mask, maskPreBlend);
}
break;
case SkMask::kLCD32_Format:
if (maskPreBlend.isApplicable()) {
pack4xHToLCD32<true>(bm, mask, maskPreBlend);
} else {
pack4xHToLCD32<false>(bm, mask, maskPreBlend);
}
break;
default:
break;
}
}
void SkScalerContext_FreeType_Base::generateGlyphImage(
FT_Face face,
const SkGlyph& glyph,
const SkMatrix& bitmapTransform)
{
const bool doBGR = SkToBool(fRec.fFlags & SkScalerContext::kLCD_BGROrder_Flag);
const bool doVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag);
switch ( face->glyph->format ) {
case FT_GLYPH_FORMAT_OUTLINE: {
FT_Outline* outline = &face->glyph->outline;
int dx = 0, dy = 0;
if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) {
dx = SkFixedToFDot6(glyph.getSubXFixed());
dy = SkFixedToFDot6(glyph.getSubYFixed());
// negate dy since freetype-y-goes-up and skia-y-goes-down
dy = -dy;
}
memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
if (SkMask::kLCD16_Format == glyph.fMaskFormat) {
FT_Outline_Translate(outline, dx, dy);
FT_Error err = FT_Render_Glyph(face->glyph, doVert ? FT_RENDER_MODE_LCD_V :
FT_RENDER_MODE_LCD);
if (err) {
SK_TRACEFTR(err, "Could not render glyph.");
return;
}
SkMask mask;
glyph.toMask(&mask);
#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
memset(mask.fImage, 0x80, mask.fBounds.height() * mask.fRowBytes);
#endif
FT_GlyphSlotRec& ftGlyph = *face->glyph;
if (!SkIRect::Intersects(mask.fBounds,
SkIRect::MakeXYWH( ftGlyph.bitmap_left,
-ftGlyph.bitmap_top,
ftGlyph.bitmap.width,
ftGlyph.bitmap.rows)))
{
return;
}
// If the FT_Bitmap extent is larger, discard bits of the bitmap outside the mask.
// If the SkMask extent is larger, shrink mask to fit bitmap (clearing discarded).
unsigned char* origBuffer = ftGlyph.bitmap.buffer;
// First align the top left (origin).
if (-ftGlyph.bitmap_top < mask.fBounds.fTop) {
int32_t topDiff = mask.fBounds.fTop - (-ftGlyph.bitmap_top);
ftGlyph.bitmap.buffer += ftGlyph.bitmap.pitch * topDiff;
ftGlyph.bitmap.rows -= topDiff;
ftGlyph.bitmap_top = -mask.fBounds.fTop;
}
if (ftGlyph.bitmap_left < mask.fBounds.fLeft) {
int32_t leftDiff = mask.fBounds.fLeft - ftGlyph.bitmap_left;
ftGlyph.bitmap.buffer += leftDiff;
ftGlyph.bitmap.width -= leftDiff;
ftGlyph.bitmap_left = mask.fBounds.fLeft;
}
if (mask.fBounds.fTop < -ftGlyph.bitmap_top) {
mask.fImage += mask.fRowBytes * (-ftGlyph.bitmap_top - mask.fBounds.fTop);
mask.fBounds.fTop = -ftGlyph.bitmap_top;
}
if (mask.fBounds.fLeft < ftGlyph.bitmap_left) {
mask.fImage += sizeof(uint16_t) * (ftGlyph.bitmap_left - mask.fBounds.fLeft);
mask.fBounds.fLeft = ftGlyph.bitmap_left;
}
// Origins aligned, clean up the width and height.
int ftVertScale = (doVert ? 3 : 1);
int ftHoriScale = (doVert ? 1 : 3);
if (mask.fBounds.height() * ftVertScale < SkToInt(ftGlyph.bitmap.rows)) {
ftGlyph.bitmap.rows = mask.fBounds.height() * ftVertScale;
}
if (mask.fBounds.width() * ftHoriScale < SkToInt(ftGlyph.bitmap.width)) {
ftGlyph.bitmap.width = mask.fBounds.width() * ftHoriScale;
}
if (SkToInt(ftGlyph.bitmap.rows) < mask.fBounds.height() * ftVertScale) {
mask.fBounds.fBottom = mask.fBounds.fTop + ftGlyph.bitmap.rows / ftVertScale;
}
if (SkToInt(ftGlyph.bitmap.width) < mask.fBounds.width() * ftHoriScale) {
mask.fBounds.fRight = mask.fBounds.fLeft + ftGlyph.bitmap.width / ftHoriScale;
}
if (fPreBlend.isApplicable()) {
copyFT2LCD16<true>(ftGlyph.bitmap, mask, doBGR,
fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
} else {
copyFT2LCD16<false>(ftGlyph.bitmap, mask, doBGR,
fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
}
// Restore the buffer pointer so FreeType can properly free it.
ftGlyph.bitmap.buffer = origBuffer;
} else {
FT_BBox bbox;
FT_Bitmap target;
FT_Outline_Get_CBox(outline, &bbox);
/*
what we really want to do for subpixel is
offset(dx, dy)
compute_bounds
offset(bbox & !63)
but that is two calls to offset, so we do the following, which
achieves the same thing with only one offset call.
*/
FT_Outline_Translate(outline, dx - ((bbox.xMin + dx) & ~63),
dy - ((bbox.yMin + dy) & ~63));
target.width = glyph.fWidth;
target.rows = glyph.fHeight;
target.pitch = glyph.rowBytes();
target.buffer = reinterpret_cast<uint8_t*>(glyph.fImage);
target.pixel_mode = compute_pixel_mode( (SkMask::Format)fRec.fMaskFormat);
target.num_grays = 256;
FT_Outline_Get_Bitmap(face->glyph->library, outline, &target);
#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
for (int y = 0; y < glyph.fHeight; ++y) {
for (int x = 0; x < glyph.fWidth; ++x) {
uint8_t& a = ((uint8_t*)glyph.fImage)[(glyph.rowBytes() * y) + x];
a = SkTMax<uint8_t>(a, 0x20);
}
}
#endif
}
} break;
case FT_GLYPH_FORMAT_BITMAP: {
FT_Pixel_Mode pixel_mode = static_cast<FT_Pixel_Mode>(face->glyph->bitmap.pixel_mode);
SkMask::Format maskFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
// Assume that the other formats do not exist.
SkASSERT(FT_PIXEL_MODE_MONO == pixel_mode ||
FT_PIXEL_MODE_GRAY == pixel_mode ||
FT_PIXEL_MODE_BGRA == pixel_mode);
// These are the only formats this ScalerContext should request.
SkASSERT(SkMask::kBW_Format == maskFormat ||
SkMask::kA8_Format == maskFormat ||
SkMask::kARGB32_Format == maskFormat ||
SkMask::kLCD16_Format == maskFormat);
// If no scaling needed, directly copy glyph bitmap.
if (bitmapTransform.isIdentity()) {
SkMask dstMask;
glyph.toMask(&dstMask);
copyFTBitmap(face->glyph->bitmap, dstMask);
break;
}
// Otherwise, scale the bitmap.
// Copy the FT_Bitmap into an SkBitmap (either A8 or ARGB)
SkBitmap unscaledBitmap;
// TODO: mark this as sRGB when the blits will be sRGB.
unscaledBitmap.allocPixels(SkImageInfo::Make(face->glyph->bitmap.width,
face->glyph->bitmap.rows,
SkColorType_for_FTPixelMode(pixel_mode),
kPremul_SkAlphaType));
SkMask unscaledBitmapAlias;
unscaledBitmapAlias.fImage = reinterpret_cast<uint8_t*>(unscaledBitmap.getPixels());
unscaledBitmapAlias.fBounds.set(0, 0, unscaledBitmap.width(), unscaledBitmap.height());
unscaledBitmapAlias.fRowBytes = unscaledBitmap.rowBytes();
unscaledBitmapAlias.fFormat = SkMaskFormat_for_SkColorType(unscaledBitmap.colorType());
copyFTBitmap(face->glyph->bitmap, unscaledBitmapAlias);
// Wrap the glyph's mask in a bitmap, unless the glyph's mask is BW or LCD.
// BW requires an A8 target for resizing, which can then be down sampled.
// LCD should use a 4x A8 target, which will then be down sampled.
// For simplicity, LCD uses A8 and is replicated.
int bitmapRowBytes = 0;
if (SkMask::kBW_Format != maskFormat && SkMask::kLCD16_Format != maskFormat) {
bitmapRowBytes = glyph.rowBytes();
}
SkBitmap dstBitmap;
// TODO: mark this as sRGB when the blits will be sRGB.
dstBitmap.setInfo(SkImageInfo::Make(glyph.fWidth, glyph.fHeight,
SkColorType_for_SkMaskFormat(maskFormat),
kPremul_SkAlphaType),
bitmapRowBytes);
if (SkMask::kBW_Format == maskFormat || SkMask::kLCD16_Format == maskFormat) {
dstBitmap.allocPixels();
} else {
dstBitmap.setPixels(glyph.fImage);
}
// Scale unscaledBitmap into dstBitmap.
SkCanvas canvas(dstBitmap);
#ifdef SK_SHOW_TEXT_BLIT_COVERAGE
canvas.clear(0x33FF0000);
#else
canvas.clear(SK_ColorTRANSPARENT);
#endif
canvas.translate(-glyph.fLeft, -glyph.fTop);
canvas.concat(bitmapTransform);
canvas.translate(face->glyph->bitmap_left, -face->glyph->bitmap_top);
SkPaint paint;
paint.setFilterQuality(kMedium_SkFilterQuality);
canvas.drawBitmap(unscaledBitmap, 0, 0, &paint);
// If the destination is BW or LCD, convert from A8.
if (SkMask::kBW_Format == maskFormat) {
// Copy the A8 dstBitmap into the A1 glyph.fImage.
SkMask dstMask;
glyph.toMask(&dstMask);
packA8ToA1(dstMask, dstBitmap.getAddr8(0, 0), dstBitmap.rowBytes());
} else if (SkMask::kLCD16_Format == maskFormat) {
// Copy the A8 dstBitmap into the LCD16 glyph.fImage.
uint8_t* src = dstBitmap.getAddr8(0, 0);
uint16_t* dst = reinterpret_cast<uint16_t*>(glyph.fImage);
for (int y = dstBitmap.height(); y --> 0;) {
for (int x = 0; x < dstBitmap.width(); ++x) {
dst[x] = grayToRGB16(src[x]);
}
dst = (uint16_t*)((char*)dst + glyph.rowBytes());
src += dstBitmap.rowBytes();
}
}
} break;
default:
SkDEBUGFAIL("unknown glyph format");
memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight);
return;
}
// We used to always do this pre-USE_COLOR_LUMINANCE, but with colorlum,
// it is optional
#if defined(SK_GAMMA_APPLY_TO_A8)
if (SkMask::kA8_Format == glyph.fMaskFormat && fPreBlend.isApplicable()) {
uint8_t* SK_RESTRICT dst = (uint8_t*)glyph.fImage;
unsigned rowBytes = glyph.rowBytes();
for (int y = glyph.fHeight - 1; y >= 0; --y) {
for (int x = glyph.fWidth - 1; x >= 0; --x) {
dst[x] = fPreBlend.fG[dst[x]];
}
dst += rowBytes;
}
}
#endif
}
