| /* |
| * Copyright 2006-2012 The Android Open Source Project |
| * Copyright 2012 Mozilla Foundation |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/core/SkBitmap.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkPath.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "include/private/SkColorData.h" |
| #include "include/private/SkTo.h" |
| #include "src/core/SkFDot6.h" |
| #include "src/ports/SkFontHost_FreeType_common.h" |
| |
| #include <utility> |
| |
| #include <ft2build.h> |
| #include FT_FREETYPE_H |
| #include FT_BITMAP_H |
| #ifdef FT_COLOR_H |
| # include FT_COLOR_H |
| #endif |
| #include FT_IMAGE_H |
| #include FT_OUTLINE_H |
| #include FT_SIZES_H |
| // In the past, FT_GlyphSlot_Own_Bitmap was defined in this header file. |
| #include FT_SYNTHESIS_H |
| |
| #ifdef TT_SUPPORT_COLRV1 |
| #include "src/core/SkScopeExit.h" |
| #endif |
| |
| // FT_LOAD_COLOR and the corresponding FT_Pixel_Mode::FT_PIXEL_MODE_BGRA |
| // were introduced in FreeType 2.5.0. |
| // The following may be removed once FreeType 2.5.0 is required to build. |
| #ifndef FT_LOAD_COLOR |
| # define FT_LOAD_COLOR ( 1L << 20 ) |
| # define FT_PIXEL_MODE_BGRA 7 |
| #endif |
| |
| #ifdef SK_DEBUG |
| const char* SkTraceFtrGetError(int e) { |
| switch ((FT_Error)e) { |
| #undef FTERRORS_H_ |
| #define FT_ERRORDEF( e, v, s ) case v: return s; |
| #define FT_ERROR_START_LIST |
| #define FT_ERROR_END_LIST |
| #include FT_ERRORS_H |
| #undef FT_ERRORDEF |
| #undef FT_ERROR_START_LIST |
| #undef FT_ERROR_END_LIST |
| default: return ""; |
| } |
| } |
| #endif // SK_DEBUG |
| |
| #ifdef TT_SUPPORT_COLRV1 |
| bool operator==(const FT_OpaquePaint& a, const FT_OpaquePaint& b) { |
| return a.p == b.p && a.insert_root_transform == b.insert_root_transform; |
| } |
| #endif |
| |
| namespace { |
| |
| FT_Pixel_Mode compute_pixel_mode(SkMask::Format format) { |
| switch (format) { |
| case SkMask::kBW_Format: |
| return FT_PIXEL_MODE_MONO; |
| case SkMask::kA8_Format: |
| default: |
| return FT_PIXEL_MODE_GRAY; |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| uint16_t packTriple(U8CPU r, U8CPU g, U8CPU b) { |
| #ifdef SK_SHOW_TEXT_BLIT_COVERAGE |
| r = std::max(r, (U8CPU)0x40); |
| g = std::max(g, (U8CPU)0x40); |
| b = std::max(b, (U8CPU)0x40); |
| #endif |
| return SkPack888ToRGB16(r, g, b); |
| } |
| |
| uint16_t grayToRGB16(U8CPU gray) { |
| #ifdef SK_SHOW_TEXT_BLIT_COVERAGE |
| gray = std::max(gray, (U8CPU)0x40); |
| #endif |
| return SkPack888ToRGB16(gray, gray, gray); |
| } |
| |
| int bittst(const uint8_t data[], int bitOffset) { |
| SkASSERT(bitOffset >= 0); |
| int lowBit = data[bitOffset >> 3] >> (~bitOffset & 7); |
| return lowBit & 1; |
| } |
| |
| /** |
| * Copies a FT_Bitmap into an SkMask with the same dimensions. |
| * |
| * FT_PIXEL_MODE_MONO |
| * FT_PIXEL_MODE_GRAY |
| * FT_PIXEL_MODE_LCD |
| * FT_PIXEL_MODE_LCD_V |
| */ |
| template<bool APPLY_PREBLEND> |
| void copyFT2LCD16(const FT_Bitmap& bitmap, const SkMask& mask, int lcdIsBGR, |
| const uint8_t* tableR, const uint8_t* tableG, const uint8_t* tableB) |
| { |
| SkASSERT(SkMask::kLCD16_Format == mask.fFormat); |
| if (FT_PIXEL_MODE_LCD != bitmap.pixel_mode) { |
| SkASSERT(mask.fBounds.width() == static_cast<int>(bitmap.width)); |
| } |
| if (FT_PIXEL_MODE_LCD_V != bitmap.pixel_mode) { |
| SkASSERT(mask.fBounds.height() == static_cast<int>(bitmap.rows)); |
| } |
| |
| const uint8_t* src = bitmap.buffer; |
| uint16_t* dst = reinterpret_cast<uint16_t*>(mask.fImage); |
| const size_t dstRB = mask.fRowBytes; |
| |
| const int width = mask.fBounds.width(); |
| const int height = mask.fBounds.height(); |
| |
| switch (bitmap.pixel_mode) { |
| case FT_PIXEL_MODE_MONO: |
| for (int y = height; y --> 0;) { |
| for (int x = 0; x < width; ++x) { |
| dst[x] = -bittst(src, x); |
| } |
| dst = (uint16_t*)((char*)dst + dstRB); |
| src += bitmap.pitch; |
| } |
| break; |
| case FT_PIXEL_MODE_GRAY: |
| for (int y = height; y --> 0;) { |
| for (int x = 0; x < width; ++x) { |
| dst[x] = grayToRGB16(src[x]); |
| } |
| dst = (uint16_t*)((char*)dst + dstRB); |
| src += bitmap.pitch; |
| } |
| break; |
| case FT_PIXEL_MODE_LCD: |
| SkASSERT(3 * mask.fBounds.width() == static_cast<int>(bitmap.width)); |
| for (int y = height; y --> 0;) { |
| const uint8_t* triple = src; |
| if (lcdIsBGR) { |
| for (int x = 0; x < width; x++) { |
| dst[x] = packTriple(sk_apply_lut_if<APPLY_PREBLEND>(triple[2], tableR), |
| sk_apply_lut_if<APPLY_PREBLEND>(triple[1], tableG), |
| sk_apply_lut_if<APPLY_PREBLEND>(triple[0], tableB)); |
| triple += 3; |
| } |
| } else { |
| for (int x = 0; x < width; x++) { |
| dst[x] = packTriple(sk_apply_lut_if<APPLY_PREBLEND>(triple[0], tableR), |
| sk_apply_lut_if<APPLY_PREBLEND>(triple[1], tableG), |
| sk_apply_lut_if<APPLY_PREBLEND>(triple[2], tableB)); |
| triple += 3; |
| } |
| } |
| src += bitmap.pitch; |
| dst = (uint16_t*)((char*)dst + dstRB); |
| } |
| break; |
| case FT_PIXEL_MODE_LCD_V: |
| SkASSERT(3 * mask.fBounds.height() == static_cast<int>(bitmap.rows)); |
| for (int y = height; y --> 0;) { |
| const uint8_t* srcR = src; |
| const uint8_t* srcG = srcR + bitmap.pitch; |
| const uint8_t* srcB = srcG + bitmap.pitch; |
| if (lcdIsBGR) { |
| using std::swap; |
| swap(srcR, srcB); |
| } |
| for (int x = 0; x < width; x++) { |
| dst[x] = packTriple(sk_apply_lut_if<APPLY_PREBLEND>(*srcR++, tableR), |
| sk_apply_lut_if<APPLY_PREBLEND>(*srcG++, tableG), |
| sk_apply_lut_if<APPLY_PREBLEND>(*srcB++, tableB)); |
| } |
| src += 3 * bitmap.pitch; |
| dst = (uint16_t*)((char*)dst + dstRB); |
| } |
| break; |
| default: |
| SkDEBUGF("FT_Pixel_Mode %d", bitmap.pixel_mode); |
| SkDEBUGFAIL("unsupported FT_Pixel_Mode for LCD16"); |
| break; |
| } |
| } |
| |
| /** |
| * 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. |
| */ |
| 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 = std::min(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"); |
| } |
| } |
| |
| inline int convert_8_to_1(unsigned byte) { |
| SkASSERT(byte <= 0xFF); |
| // Arbitrary decision that making the cutoff at 1/4 instead of 1/2 in general looks better. |
| return (byte >> 6) != 0; |
| } |
| |
| uint8_t pack_8_to_1(const uint8_t alpha[8]) { |
| unsigned bits = 0; |
| for (int i = 0; i < 8; ++i) { |
| bits <<= 1; |
| bits |= convert_8_to_1(alpha[i]); |
| } |
| return SkToU8(bits); |
| } |
| |
| void packA8ToA1(const SkMask& mask, const uint8_t* src, size_t srcRB) { |
| const int height = mask.fBounds.height(); |
| const int width = mask.fBounds.width(); |
| const int octs = width >> 3; |
| const int leftOverBits = width & 7; |
| |
| uint8_t* dst = mask.fImage; |
| const int dstPad = mask.fRowBytes - SkAlign8(width)/8; |
| SkASSERT(dstPad >= 0); |
| |
| const int srcPad = srcRB - width; |
| SkASSERT(srcPad >= 0); |
| |
| for (int y = 0; y < height; ++y) { |
| for (int i = 0; i < octs; ++i) { |
| *dst++ = pack_8_to_1(src); |
| src += 8; |
| } |
| if (leftOverBits > 0) { |
| unsigned bits = 0; |
| int shift = 7; |
| for (int i = 0; i < leftOverBits; ++i, --shift) { |
| bits |= convert_8_to_1(*src++) << shift; |
| } |
| *dst++ = bits; |
| } |
| src += srcPad; |
| dst += dstPad; |
| } |
| } |
| |
| inline SkMask::Format SkMaskFormat_for_SkColorType(SkColorType colorType) { |
| switch (colorType) { |
| case kAlpha_8_SkColorType: |
| return SkMask::kA8_Format; |
| case kN32_SkColorType: |
| return SkMask::kARGB32_Format; |
| default: |
| SkDEBUGFAIL("unsupported SkBitmap::Config"); |
| return SkMask::kA8_Format; |
| } |
| } |
| |
| inline SkColorType SkColorType_for_FTPixelMode(FT_Pixel_Mode pixel_mode) { |
| switch (pixel_mode) { |
| case FT_PIXEL_MODE_MONO: |
| case FT_PIXEL_MODE_GRAY: |
| return kAlpha_8_SkColorType; |
| case FT_PIXEL_MODE_BGRA: |
| return kN32_SkColorType; |
| default: |
| SkDEBUGFAIL("unsupported FT_PIXEL_MODE"); |
| return kAlpha_8_SkColorType; |
| } |
| } |
| |
| inline SkColorType SkColorType_for_SkMaskFormat(SkMask::Format format) { |
| switch (format) { |
| case SkMask::kBW_Format: |
| case SkMask::kA8_Format: |
| case SkMask::kLCD16_Format: |
| return kAlpha_8_SkColorType; |
| case SkMask::kARGB32_Format: |
| return kN32_SkColorType; |
| default: |
| SkDEBUGFAIL("unsupported destination SkBitmap::Config"); |
| return kAlpha_8_SkColorType; |
| } |
| } |
| |
| // Only build COLRv1 rendering code if FreeType is new enough to have COLRv1 |
| // additions. FreeType defines a macro in the ftoption header to tell us whether |
| // it does support these features. |
| #ifdef TT_SUPPORT_COLRV1 |
| |
| struct OpaquePaintHasher { |
| size_t operator()(const FT_OpaquePaint& opaque_paint) { |
| return SkGoodHash()(opaque_paint.p) ^ |
| SkGoodHash()(opaque_paint.insert_root_transform); |
| } |
| }; |
| |
| using VisitedSet = SkTHashSet<FT_OpaquePaint, OpaquePaintHasher>; |
| |
| bool generateFacePathCOLRv1(FT_Face face, SkGlyphID glyphID, SkPath* path); |
| |
| inline float SkColrV1AlphaToFloat(uint16_t alpha) { return (alpha / float(1 << 14)); } |
| |
| |
| inline SkTileMode ToSkTileMode(FT_PaintExtend extend_mode) { |
| switch (extend_mode) { |
| case FT_COLR_PAINT_EXTEND_REPEAT: |
| return SkTileMode::kRepeat; |
| case FT_COLR_PAINT_EXTEND_REFLECT: |
| return SkTileMode::kMirror; |
| default: |
| return SkTileMode::kClamp; |
| } |
| } |
| |
| inline SkBlendMode ToSkBlendMode(FT_Composite_Mode composite) { |
| switch (composite) { |
| case FT_COLR_COMPOSITE_CLEAR: |
| return SkBlendMode::kClear; |
| case FT_COLR_COMPOSITE_SRC: |
| return SkBlendMode::kSrc; |
| case FT_COLR_COMPOSITE_DEST: |
| return SkBlendMode::kDst; |
| case FT_COLR_COMPOSITE_SRC_OVER: |
| return SkBlendMode::kSrcOver; |
| case FT_COLR_COMPOSITE_DEST_OVER: |
| return SkBlendMode::kDstOver; |
| case FT_COLR_COMPOSITE_SRC_IN: |
| return SkBlendMode::kSrcIn; |
| case FT_COLR_COMPOSITE_DEST_IN: |
| return SkBlendMode::kDstIn; |
| case FT_COLR_COMPOSITE_SRC_OUT: |
| return SkBlendMode::kSrcOut; |
| case FT_COLR_COMPOSITE_DEST_OUT: |
| return SkBlendMode::kDstOut; |
| case FT_COLR_COMPOSITE_SRC_ATOP: |
| return SkBlendMode::kSrcATop; |
| case FT_COLR_COMPOSITE_DEST_ATOP: |
| return SkBlendMode::kDstATop; |
| case FT_COLR_COMPOSITE_XOR: |
| return SkBlendMode::kXor; |
| case FT_COLR_COMPOSITE_SCREEN: |
| return SkBlendMode::kScreen; |
| case FT_COLR_COMPOSITE_OVERLAY: |
| return SkBlendMode::kOverlay; |
| case FT_COLR_COMPOSITE_DARKEN: |
| return SkBlendMode::kDarken; |
| case FT_COLR_COMPOSITE_LIGHTEN: |
| return SkBlendMode::kLighten; |
| case FT_COLR_COMPOSITE_COLOR_DODGE: |
| return SkBlendMode::kColorDodge; |
| case FT_COLR_COMPOSITE_COLOR_BURN: |
| return SkBlendMode::kColorBurn; |
| case FT_COLR_COMPOSITE_HARD_LIGHT: |
| return SkBlendMode::kHardLight; |
| case FT_COLR_COMPOSITE_SOFT_LIGHT: |
| return SkBlendMode::kSoftLight; |
| case FT_COLR_COMPOSITE_DIFFERENCE: |
| return SkBlendMode::kDifference; |
| case FT_COLR_COMPOSITE_EXCLUSION: |
| return SkBlendMode::kExclusion; |
| case FT_COLR_COMPOSITE_MULTIPLY: |
| return SkBlendMode::kMultiply; |
| case FT_COLR_COMPOSITE_HSL_HUE: |
| return SkBlendMode::kHue; |
| case FT_COLR_COMPOSITE_HSL_SATURATION: |
| return SkBlendMode::kSaturation; |
| case FT_COLR_COMPOSITE_HSL_COLOR: |
| return SkBlendMode::kColor; |
| case FT_COLR_COMPOSITE_HSL_LUMINOSITY: |
| return SkBlendMode::kLuminosity; |
| default: |
| return SkBlendMode::kDst; |
| } |
| } |
| |
| inline SkMatrix ToSkMatrix(FT_Affine23 affine23) { |
| // Adjust order to convert from FreeType's FT_Affine23 column major order to SkMatrix row-major |
| // order. |
| return SkMatrix::MakeAll( |
| SkFixedToScalar(affine23.xx), -SkFixedToScalar(affine23.xy), SkFixedToScalar(affine23.dx), |
| -SkFixedToScalar(affine23.yx), SkFixedToScalar(affine23.yy), -SkFixedToScalar(affine23.dy), |
| 0, 0, 1); |
| } |
| |
| inline SkPoint SkVectorProjection(SkPoint a, SkPoint b) { |
| SkScalar length = b.length(); |
| if (!length) return SkPoint(); |
| SkPoint b_normalized = b; |
| b_normalized.normalize(); |
| b_normalized.scale(SkPoint::DotProduct(a, b) / length); |
| return b_normalized; |
| } |
| |
| void colrv1_configure_skpaint(FT_Face face, const FT_Color* palette, |
| FT_COLR_Paint colrv1_paint, SkPaint* paint) { |
| |
| auto fetch_color_stops = [&face, &palette](FT_ColorStopIterator& color_stop_iterator, |
| std::vector<SkScalar>& stops, |
| std::vector<SkColor>& colors) { |
| const FT_UInt num_color_stops = color_stop_iterator.num_color_stops; |
| |
| // 5.7.11.2.4 ColorIndex, ColorStop and ColorLine |
| // "Applications shall apply the colorStops in increasing stopOffset order." |
| struct ColorStop { |
| SkScalar stop_pos; |
| SkColor color; |
| }; |
| std::vector<ColorStop> sorted_stops; |
| sorted_stops.resize(num_color_stops); |
| |
| FT_ColorStop color_stop; |
| while (FT_Get_Colorline_Stops(face, &color_stop, &color_stop_iterator)) { |
| FT_UInt index = color_stop_iterator.current_color_stop - 1; |
| sorted_stops[index].stop_pos = color_stop.stop_offset / float(1 << 14); |
| FT_UInt16& palette_index = color_stop.color.palette_index; |
| // TODO(drott): Ensure palette_index is sanitized on the FreeType |
| // side and 0xFFFF foreground color will be handled correctly here. |
| sorted_stops[index].color = SkColorSetARGB( |
| palette[palette_index].alpha * SkColrV1AlphaToFloat(color_stop.color.alpha), |
| palette[palette_index].red, |
| palette[palette_index].green, |
| palette[palette_index].blue); |
| } |
| |
| std::stable_sort( |
| sorted_stops.begin(), |
| sorted_stops.end(), |
| [](const ColorStop& a, const ColorStop& b) { return a.stop_pos < b.stop_pos; }); |
| |
| stops.resize(num_color_stops); |
| colors.resize(num_color_stops); |
| for (size_t i = 0; i < num_color_stops; ++i) { |
| stops[i] = sorted_stops[i].stop_pos; |
| colors[i] = sorted_stops[i].color; |
| } |
| }; |
| |
| switch (colrv1_paint.format) { |
| case FT_COLR_PAINTFORMAT_SOLID: { |
| FT_PaintSolid solid = colrv1_paint.u.solid; |
| SkColor color = |
| SkColorSetARGB(palette[solid.color.palette_index].alpha * |
| SkColrV1AlphaToFloat(solid.color.alpha), |
| palette[solid.color.palette_index].red, |
| palette[solid.color.palette_index].green, |
| palette[solid.color.palette_index].blue); |
| paint->setShader(nullptr); |
| paint->setColor(color); |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT: { |
| FT_PaintLinearGradient& linear_gradient = colrv1_paint.u.linear_gradient; |
| SkPoint line_positions[2] = { |
| SkPoint::Make(linear_gradient.p0.x, -linear_gradient.p0.y), |
| SkPoint::Make(linear_gradient.p1.x, -linear_gradient.p1.y) |
| }; |
| SkPoint p0 = line_positions[0]; |
| SkPoint p1 = line_positions[1]; |
| SkPoint p2 = SkPoint::Make(linear_gradient.p2.x, -linear_gradient.p2.y); |
| |
| // Do not draw the gradient of p0p1 is parallel to p0p2. |
| if (p1 == p0 || p2 == p0 || !SkPoint::CrossProduct(p1 - p0, p2 - p0)) break; |
| |
| // Follow implementation note in nanoemoji: |
| // https://github.com/googlefonts/nanoemoji/blob/0ac6e7bb4d8202db692574d8530a9b643f1b3b3c/src/nanoemoji/svg.py#L188 |
| // to compute a new gradient end point as the orthogonal projection of the vector from p0 to p1 onto a line |
| // perpendicular to line p0p2 and passing through p0. |
| SkVector perpendicular_to_p2_p0 = (p2 - p0); |
| perpendicular_to_p2_p0 = SkPoint::Make(perpendicular_to_p2_p0.y(), -perpendicular_to_p2_p0.x()); |
| line_positions[1] = p0 + SkVectorProjection((p1 - p0), perpendicular_to_p2_p0); |
| |
| std::vector<SkScalar> stops; |
| std::vector<SkColor> colors; |
| fetch_color_stops(linear_gradient.colorline.color_stop_iterator, stops, colors); |
| |
| if (stops.empty()) { |
| break; |
| } |
| |
| if (stops.size() == 1) { |
| paint->setColor(colors[0]); |
| break; |
| } |
| |
| // Project/scale points according to stop extrema along p0p1 line, |
| // then scale stops to to [0, 1] range so that repeat modes work. |
| // The Skia linear gradient shader performs the repeat modes over |
| // the 0 to 1 range, that's why we need to scale the stops to within |
| // that range. |
| SkVector p0p1 = p1 - p0; |
| SkVector new_p0_offset = p0p1; |
| new_p0_offset.scale(stops.front()); |
| SkVector new_p1_offset = p0p1; |
| new_p1_offset.scale(stops.back()); |
| |
| line_positions[0] = p0 + new_p0_offset; |
| line_positions[1] = p0 + new_p1_offset; |
| |
| SkScalar scale_factor = 1 / (stops.back() - stops.front()); |
| SkScalar start_offset = stops.front(); |
| for (SkScalar& stop : stops) { |
| stop = (stop - start_offset) * scale_factor; |
| } |
| |
| sk_sp<SkShader> shader(SkGradientShader::MakeLinear( |
| line_positions, |
| colors.data(), |
| stops.data(), |
| stops.size(), |
| ToSkTileMode(linear_gradient.colorline.extend))); |
| SkASSERT(shader); |
| // An opaque color is needed to ensure the gradient's not modulated by alpha. |
| paint->setColor(SK_ColorBLACK); |
| paint->setShader(shader); |
| |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT: { |
| FT_PaintRadialGradient& radial_gradient = colrv1_paint.u.radial_gradient; |
| SkPoint start = SkPoint::Make(radial_gradient.c0.x, -radial_gradient.c0.y); |
| SkScalar radius = radial_gradient.r0; |
| SkPoint end = SkPoint::Make(radial_gradient.c1.x, -radial_gradient.c1.y); |
| SkScalar end_radius = radial_gradient.r1; |
| |
| |
| std::vector<SkScalar> stops; |
| std::vector<SkColor> colors; |
| fetch_color_stops(radial_gradient.colorline.color_stop_iterator, stops, colors); |
| |
| // An opaque color is needed to ensure the gradient's not modulated by alpha. |
| paint->setColor(SK_ColorBLACK); |
| |
| paint->setShader(SkGradientShader::MakeTwoPointConical( |
| start, radius, end, end_radius, colors.data(), stops.data(), stops.size(), |
| ToSkTileMode(radial_gradient.colorline.extend))); |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT: { |
| FT_PaintSweepGradient& sweep_gradient = colrv1_paint.u.sweep_gradient; |
| SkPoint center = SkPoint::Make(sweep_gradient.center.x, -sweep_gradient.center.y); |
| SkScalar startAngle = SkFixedToScalar(sweep_gradient.start_angle); |
| SkScalar endAngle = SkFixedToScalar(sweep_gradient.end_angle); |
| |
| std::vector<SkScalar> stops; |
| std::vector<SkColor> colors; |
| fetch_color_stops(sweep_gradient.colorline.color_stop_iterator, stops, colors); |
| |
| // An opaque color is needed to ensure the gradient's not modulated by alpha. |
| paint->setColor(SK_ColorBLACK); |
| |
| // Prepare angles to be within range for the shader. |
| auto clampAngleToRange= [](SkScalar angle) { |
| SkScalar clamped_angle = SkScalarMod(angle, 360.f); |
| if (clamped_angle < 0) |
| return clamped_angle + 360.f; |
| return clamped_angle; |
| }; |
| startAngle = clampAngleToRange(startAngle); |
| endAngle = clampAngleToRange(endAngle); |
| /* TODO: Spec clarifications on which side of the gradient is to be |
| * painted, repeat modes, how to handle 0 degrees transition, see |
| * https://github.com/googlefonts/colr-gradients-spec/issues/250 */ |
| if (startAngle >= endAngle) |
| endAngle += 360.f; |
| |
| // Skia's angles start from the horizontal x-Axis, rotate left 90 |
| // degrees and then mirror horizontally to correct for Skia angles |
| // going clockwise, COLR v1 angles going counterclockwise. |
| SkMatrix angle_adjust = SkMatrix::RotateDeg(-90.f, center); |
| angle_adjust.postScale(-1, 1, center.x(), center.y()); |
| |
| paint->setShader(SkGradientShader::MakeSweep( |
| center.x(), center.y(), colors.data(), stops.data(), stops.size(), |
| SkTileMode::kDecal, startAngle, endAngle, 0, &angle_adjust)); |
| break; |
| } |
| default: { |
| SkASSERT(false); /* not reached */ |
| } |
| } |
| } |
| |
| |
| void colrv1_draw_paint(SkCanvas* canvas, |
| const FT_Color* palette, |
| FT_Face face, |
| FT_COLR_Paint colrv1_paint) { |
| SkPaint paint; |
| |
| switch (colrv1_paint.format) { |
| case FT_COLR_PAINTFORMAT_GLYPH: { |
| FT_UInt glyphID = colrv1_paint.u.glyph.glyphID; |
| SkPath path; |
| /* TODO: Currently this call retrieves the path at units_per_em size. If we want to get |
| * correct hinting for the scaled size under the transforms at this point in the color |
| * glyph graph, we need to extract at least the requested glyph width and height and |
| * pass that to the path generation. */ |
| if (generateFacePathCOLRv1(face, glyphID, &path)) { |
| |
| #ifdef SK_SHOW_TEXT_BLIT_COVERAGE |
| SkPaint highlight_paint; |
| highlight_paint.setColor(0x33FF0000); |
| canvas->drawRect(path.getBounds(), highlight_paint); |
| #endif |
| canvas->clipPath(path, true /* doAntiAlias */); |
| } |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_SOLID: |
| case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT: |
| case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT: |
| case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT: { |
| SkPaint colrPaint; |
| colrv1_configure_skpaint(face, palette, colrv1_paint, &colrPaint); |
| canvas->drawPaint(colrPaint); |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_TRANSFORMED: |
| case FT_COLR_PAINTFORMAT_TRANSLATE: |
| case FT_COLR_PAINTFORMAT_ROTATE: |
| case FT_COLR_PAINTFORMAT_SKEW: |
| SkASSERT(false); // Transforms handled in colrv1_transform. |
| break; |
| default: |
| paint.setShader(nullptr); |
| paint.setColor(SK_ColorCYAN); |
| break; |
| } |
| } |
| |
| void colrv1_draw_glyph_with_path(SkCanvas* canvas, const FT_Color* palette, FT_Face face, |
| FT_COLR_Paint glyphPaint, FT_COLR_Paint fillPaint) { |
| SkASSERT(glyphPaint.format == FT_COLR_PAINTFORMAT_GLYPH); |
| SkASSERT(fillPaint.format == FT_COLR_PAINTFORMAT_SOLID || |
| fillPaint.format == FT_COLR_PAINTFORMAT_LINEAR_GRADIENT || |
| fillPaint.format == FT_COLR_PAINTFORMAT_RADIAL_GRADIENT || |
| fillPaint.format == FT_COLR_PAINTFORMAT_SWEEP_GRADIENT); |
| |
| SkPaint skiaFillPaint; |
| skiaFillPaint.setAntiAlias(true); |
| colrv1_configure_skpaint(face, palette, fillPaint, &skiaFillPaint); |
| |
| FT_UInt glyphID = glyphPaint.u.glyph.glyphID; |
| SkPath path; |
| /* TODO: Currently this call retrieves the path at units_per_em size. If we want to get |
| * correct hinting for the scaled size under the transforms at this point in the color |
| * glyph graph, we need to extract at least the requested glyph width and height and |
| * pass that to the path generation. */ |
| if (generateFacePathCOLRv1(face, glyphID, &path)) { |
| #ifdef SK_SHOW_TEXT_BLIT_COVERAGE |
| SkPaint highlight_paint; |
| highlight_paint.setColor(0x33FF0000); |
| canvas->drawRect(path.getBounds(), highlight_paint); |
| #endif |
| { |
| canvas->drawPath(path, skiaFillPaint); |
| } |
| } |
| } |
| |
| void colrv1_transform(SkCanvas* canvas, FT_Face face, FT_COLR_Paint colrv1_paint) { |
| SkMatrix transform; |
| |
| switch (colrv1_paint.format) { |
| case FT_COLR_PAINTFORMAT_TRANSFORMED: { |
| transform = ToSkMatrix(colrv1_paint.u.transformed.affine); |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_TRANSLATE: { |
| transform = SkMatrix::Translate( |
| SkFixedToScalar(colrv1_paint.u.translate.dx), |
| -SkFixedToScalar(colrv1_paint.u.translate.dy)); |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_ROTATE: { |
| transform = SkMatrix::RotateDeg( |
| SkFixedToScalar(colrv1_paint.u.rotate.angle), |
| SkPoint::Make(SkFixedToScalar(colrv1_paint.u.rotate.center_x), |
| -SkFixedToScalar(colrv1_paint.u.rotate.center_y))); |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_SKEW: { |
| // In the PAINTFORMAT_ROTATE implementation, SkMatrix setRotate |
| // snaps to 0 for values very close to 0. Do the same here. |
| |
| SkScalar rad_x = SkDegreesToRadians(-SkFixedToFloat(colrv1_paint.u.skew.x_skew_angle)); |
| float tan_x = SkScalarTan(rad_x); |
| tan_x = SkScalarNearlyZero(tan_x) ? 0.0f : tan_x; |
| |
| SkScalar rad_y = SkDegreesToRadians(-SkFixedToFloat(colrv1_paint.u.skew.y_skew_angle)); |
| float tan_y = SkScalarTan(rad_y); |
| tan_y = SkScalarNearlyZero(tan_y) ? 0.0f : tan_y; |
| |
| SkMatrix translate_to_origin = SkMatrix::Translate( |
| SkFixedToScalar(SkFixedToFloat(colrv1_paint.u.skew.center_x)), |
| SkFixedToScalar(-SkFixedToFloat(colrv1_paint.u.skew.center_y))); |
| |
| SkMatrix translate_from_origin; |
| SkASSERT(translate_to_origin.invert(&translate_from_origin)); |
| |
| SkMatrix skew_x = SkMatrix::MakeAll( |
| 1, tan_x, 0, |
| 0, 1, 0, |
| 0, 0, 1); |
| |
| SkMatrix skew_y = SkMatrix::MakeAll( |
| 1, 0, 0, |
| tan_y, 1, 0, |
| 0, 0, 1); |
| |
| transform = translate_from_origin.postConcat(skew_x).postConcat(skew_y).postConcat(translate_to_origin); |
| break; |
| } |
| default: { |
| // Only transforms are handled in this function. |
| SkASSERT(false); |
| } |
| } |
| canvas->concat(transform); |
| } |
| |
| |
| bool colrv1_start_glyph(SkCanvas* canvas, |
| const FT_Color* palette, |
| FT_Face ft_face, |
| uint16_t glyph_id, |
| FT_Color_Root_Transform root_transform); |
| |
| bool colrv1_traverse_paint(SkCanvas* canvas, |
| const FT_Color* palette, |
| FT_Face face, |
| FT_OpaquePaint opaque_paint, |
| VisitedSet* visited_set) { |
| // Cycle detection, see section "5.7.11.1.9 Color glyphs as a directed acyclic graph". |
| if (visited_set->contains(opaque_paint)) { |
| return false; |
| } |
| |
| visited_set->add(opaque_paint); |
| SK_AT_SCOPE_EXIT(visited_set->remove(opaque_paint)); |
| |
| FT_COLR_Paint paint; |
| if (!FT_Get_Paint(face, opaque_paint, &paint)) { |
| return false; |
| } |
| |
| // Keep track of failures to retrieve the FT_COLR_Paint from FreeType in the |
| // recursion, cancel recursion when a paint retrieval fails. |
| bool traverse_result = true; |
| SkAutoCanvasRestore autoRestore(canvas, true /* do_save */); |
| switch (paint.format) { |
| case FT_COLR_PAINTFORMAT_COLR_LAYERS: { |
| FT_LayerIterator& layer_iterator = paint.u.colr_layers.layer_iterator; |
| FT_OpaquePaint opaque_paint_fetch; |
| opaque_paint_fetch.p = nullptr; |
| while (FT_Get_Paint_Layers(face, &layer_iterator, &opaque_paint_fetch)) { |
| colrv1_traverse_paint(canvas, palette, face, opaque_paint_fetch, visited_set); |
| } |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_GLYPH: |
| // Special case paint graph leaf situations to improve |
| // performance. These are situations in the graph where a GlyphPaint |
| // is followed by either a solid or a gradient fill. Here we can use |
| // drawPath() + SkPaint directly which is faster than setting a |
| // clipPath() followed by a drawPaint(). |
| FT_COLR_Paint fillPaint; |
| if (!FT_Get_Paint(face, paint.u.glyph.paint, &fillPaint)) { |
| return false; |
| } |
| if (fillPaint.format == FT_COLR_PAINTFORMAT_SOLID || |
| fillPaint.format == FT_COLR_PAINTFORMAT_LINEAR_GRADIENT || |
| fillPaint.format == FT_COLR_PAINTFORMAT_RADIAL_GRADIENT || |
| fillPaint.format == FT_COLR_PAINTFORMAT_SWEEP_GRADIENT) { |
| colrv1_draw_glyph_with_path(canvas, palette, face, paint, fillPaint); |
| } else { |
| colrv1_draw_paint(canvas, palette, face, paint); |
| traverse_result = colrv1_traverse_paint(canvas, palette, face, |
| paint.u.glyph.paint, visited_set); |
| } |
| break; |
| case FT_COLR_PAINTFORMAT_COLR_GLYPH: |
| traverse_result = colrv1_start_glyph(canvas, palette, face, paint.u.colr_glyph.glyphID, |
| FT_COLOR_NO_ROOT_TRANSFORM); |
| break; |
| case FT_COLR_PAINTFORMAT_TRANSFORMED: |
| colrv1_transform(canvas, face, paint); |
| traverse_result = colrv1_traverse_paint(canvas, palette, face, |
| paint.u.transformed.paint, visited_set); |
| break; |
| case FT_COLR_PAINTFORMAT_TRANSLATE: |
| colrv1_transform(canvas, face, paint); |
| traverse_result = colrv1_traverse_paint(canvas, palette, face, |
| paint.u.translate.paint, visited_set); |
| break; |
| case FT_COLR_PAINTFORMAT_ROTATE: |
| colrv1_transform(canvas, face, paint); |
| traverse_result = |
| colrv1_traverse_paint(canvas, palette, face, |
| paint.u.rotate.paint, visited_set); |
| break; |
| case FT_COLR_PAINTFORMAT_SKEW: |
| colrv1_transform(canvas, face, paint); |
| traverse_result = |
| colrv1_traverse_paint(canvas, palette, face, |
| paint.u.skew.paint, visited_set); |
| break; |
| case FT_COLR_PAINTFORMAT_COMPOSITE: { |
| traverse_result = colrv1_traverse_paint( |
| canvas, palette, face, paint.u.composite.backdrop_paint, visited_set); |
| SkPaint blend_mode_paint; |
| blend_mode_paint.setBlendMode(ToSkBlendMode(paint.u.composite.composite_mode)); |
| canvas->saveLayer(nullptr, &blend_mode_paint); |
| traverse_result = |
| traverse_result && |
| colrv1_traverse_paint( |
| canvas, palette, face, paint.u.composite.source_paint, visited_set); |
| canvas->restore(); |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_SOLID: |
| case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT: |
| case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT: |
| case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT: { |
| colrv1_draw_paint(canvas, palette, face, paint); |
| break; |
| } |
| default: |
| SkASSERT(false); |
| break; |
| } |
| return traverse_result; |
| } |
| |
| bool colrv1_start_glyph(SkCanvas* canvas, |
| const FT_Color* palette, |
| FT_Face ft_face, |
| uint16_t glyph_id, |
| FT_Color_Root_Transform root_transform) { |
| FT_OpaquePaint opaque_paint; |
| opaque_paint.p = nullptr; |
| bool has_colrv1_layers = false; |
| if (FT_Get_Color_Glyph_Paint(ft_face, glyph_id, root_transform, &opaque_paint)) { |
| has_colrv1_layers = true; |
| VisitedSet visited_set; |
| colrv1_traverse_paint(canvas, palette, ft_face, opaque_paint, &visited_set); |
| } |
| return has_colrv1_layers; |
| } |
| #endif // TT_SUPPORT_COLRV1 |
| |
| } // namespace |
| |
| 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 (this->isSubpixel()) { |
| 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); |
| |
| #ifdef FT_COLOR_H |
| if (SkMask::kARGB32_Format == glyph.fMaskFormat) { |
| SkBitmap dstBitmap; |
| // TODO: mark this as sRGB when the blits will be sRGB. |
| dstBitmap.setInfo(SkImageInfo::Make(glyph.fWidth, glyph.fHeight, |
| kN32_SkColorType, |
| kPremul_SkAlphaType), |
| glyph.rowBytes()); |
| 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); |
| |
| if (this->isSubpixel()) { |
| canvas.translate(SkFixedToScalar(glyph.getSubXFixed()), |
| SkFixedToScalar(glyph.getSubYFixed())); |
| } |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| |
| FT_Color *palette; |
| FT_Error err = FT_Palette_Select(face, 0, &palette); |
| if (err) { |
| SK_TRACEFTR(err, "Could not get palette from %s fontFace.", face->family_name); |
| return; |
| } |
| |
| FT_Bool haveLayers = false; |
| |
| #ifdef TT_SUPPORT_COLRV1 |
| // Only attempt to draw COLRv1 glyph is FreeType is new enough |
| // to have the COLRv1 additions, as indicated by the |
| // TT_SUPPORT_COLRV1 flag defined by the FreeType headers in |
| // that case. |
| |
| haveLayers = colrv1_start_glyph(&canvas, palette, face, glyph.getGlyphID(), |
| FT_COLOR_INCLUDE_ROOT_TRANSFORM); |
| #else |
| haveLayers = false; |
| #endif |
| if (!haveLayers) { |
| // If we didn't have colr v1 layers, try v0 layers. |
| FT_LayerIterator layerIterator; |
| layerIterator.p = NULL; |
| FT_UInt layerGlyphIndex = 0; |
| FT_UInt layerColorIndex = 0; |
| while (FT_Get_Color_Glyph_Layer(face, glyph.getGlyphID(), &layerGlyphIndex, |
| &layerColorIndex, &layerIterator)) { |
| haveLayers = true; |
| if (layerColorIndex == 0xFFFF) { |
| paint.setColor(SK_ColorBLACK); |
| } else { |
| SkColor color = SkColorSetARGB(palette[layerColorIndex].alpha, |
| palette[layerColorIndex].red, |
| palette[layerColorIndex].green, |
| palette[layerColorIndex].blue); |
| paint.setColor(color); |
| } |
| SkPath path; |
| if (this->generateFacePath(face, layerGlyphIndex, &path)) { |
| canvas.drawPath(path, paint); |
| } |
| } |
| } |
| |
| if (!haveLayers) { |
| SK_TRACEFTR(err, "Could not get layers (neither v0, nor v1) from %s fontFace.", |
| face->family_name); |
| return; |
| } |
| } else |
| #endif |
| 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 %x.", face->glyph); |
| return; |
| } |
| |
| SkMask mask = glyph.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(glyph.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 = std::max<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.mask(); |
| 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.setWH(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); |
| |
| SkSamplingOptions sampling(SkFilterMode::kLinear, SkMipmapMode::kNearest); |
| canvas.drawImage(unscaledBitmap.asImage().get(), 0, 0, sampling, nullptr); |
| |
| // 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.mask(); |
| 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 |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| namespace { |
| |
| class SkFTGeometrySink { |
| SkPath* fPath; |
| bool fStarted; |
| FT_Vector fCurrent; |
| |
| void goingTo(const FT_Vector* pt) { |
| if (!fStarted) { |
| fStarted = true; |
| fPath->moveTo(SkFDot6ToScalar(fCurrent.x), -SkFDot6ToScalar(fCurrent.y)); |
| } |
| fCurrent = *pt; |
| } |
| |
| bool currentIsNot(const FT_Vector* pt) { |
| return fCurrent.x != pt->x || fCurrent.y != pt->y; |
| } |
| |
| static int Move(const FT_Vector* pt, void* ctx) { |
| SkFTGeometrySink& self = *(SkFTGeometrySink*)ctx; |
| if (self.fStarted) { |
| self.fPath->close(); |
| self.fStarted = false; |
| } |
| self.fCurrent = *pt; |
| return 0; |
| } |
| |
| static int Line(const FT_Vector* pt, void* ctx) { |
| SkFTGeometrySink& self = *(SkFTGeometrySink*)ctx; |
| if (self.currentIsNot(pt)) { |
| self.goingTo(pt); |
| self.fPath->lineTo(SkFDot6ToScalar(pt->x), -SkFDot6ToScalar(pt->y)); |
| } |
| return 0; |
| } |
| |
| static int Quad(const FT_Vector* pt0, const FT_Vector* pt1, void* ctx) { |
| SkFTGeometrySink& self = *(SkFTGeometrySink*)ctx; |
| if (self.currentIsNot(pt0) || self.currentIsNot(pt1)) { |
| self.goingTo(pt1); |
| self.fPath->quadTo(SkFDot6ToScalar(pt0->x), -SkFDot6ToScalar(pt0->y), |
| SkFDot6ToScalar(pt1->x), -SkFDot6ToScalar(pt1->y)); |
| } |
| return 0; |
| } |
| |
| static int Cubic(const FT_Vector* pt0, const FT_Vector* pt1, const FT_Vector* pt2, void* ctx) { |
| SkFTGeometrySink& self = *(SkFTGeometrySink*)ctx; |
| if (self.currentIsNot(pt0) || self.currentIsNot(pt1) || self.currentIsNot(pt2)) { |
| self.goingTo(pt2); |
| self.fPath->cubicTo(SkFDot6ToScalar(pt0->x), -SkFDot6ToScalar(pt0->y), |
| SkFDot6ToScalar(pt1->x), -SkFDot6ToScalar(pt1->y), |
| SkFDot6ToScalar(pt2->x), -SkFDot6ToScalar(pt2->y)); |
| } |
| return 0; |
| } |
| |
| public: |
| SkFTGeometrySink(SkPath* path) : fPath{path}, fStarted{false}, fCurrent{0,0} {} |
| |
| static constexpr const FT_Outline_Funcs Funcs{ |
| /*move_to =*/ SkFTGeometrySink::Move, |
| /*line_to =*/ SkFTGeometrySink::Line, |
| /*conic_to =*/ SkFTGeometrySink::Quad, |
| /*cubic_to =*/ SkFTGeometrySink::Cubic, |
| /*shift = */ 0, |
| /*delta =*/ 0, |
| }; |
| }; |
| |
| bool generateGlyphPathStatic(FT_Face face, SkPath* path) { |
| SkFTGeometrySink sink{path}; |
| FT_Error err = FT_Outline_Decompose(&face->glyph->outline, &SkFTGeometrySink::Funcs, &sink); |
| |
| if (err != 0) { |
| path->reset(); |
| return false; |
| } |
| |
| path->close(); |
| return true; |
| } |
| |
| bool generateFacePathStatic(FT_Face face, SkGlyphID glyphID, SkPath* path) { |
| uint32_t flags = 0; //fLoadGlyphFlags; |
| flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get the outline |
| flags &= ~FT_LOAD_RENDER; // don't scan convert (we just want the outline) |
| |
| FT_Error err = FT_Load_Glyph(face, glyphID, flags); |
| if (err != 0) { |
| path->reset(); |
| return false; |
| } |
| |
| if (!generateGlyphPathStatic(face, path)) { |
| path->reset(); |
| return false; |
| } |
| return true; |
| } |
| |
| #ifdef TT_SUPPORT_COLRV1 |
| bool generateFacePathCOLRv1(FT_Face face, SkGlyphID glyphID, SkPath* path) { |
| uint32_t flags = 0; |
| flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get the outline |
| flags &= ~FT_LOAD_RENDER; // don't scan convert (we just want the outline) |
| |
| flags |= FT_LOAD_IGNORE_TRANSFORM; |
| |
| |
| using DoneFTSize = SkFunctionWrapper<decltype(FT_Done_Size), FT_Done_Size>; |
| std::unique_ptr<std::remove_pointer_t<FT_Size>, DoneFTSize> unscaledFtSize([face]() -> FT_Size { |
| FT_Size size; |
| FT_Error err = FT_New_Size(face, &size); |
| if (err != 0) { |
| SK_TRACEFTR(err, "FT_New_Size(%s) failed in generateFacePathStaticCOLRv1.", face->family_name); |
| return nullptr; |
| } |
| return size; |
| }()); |
| |
| if (!unscaledFtSize) { |
| return false; |
| } |
| |
| FT_Size oldSize = face->size; |
| |
| auto try_generate_path = [face, &unscaledFtSize, glyphID, flags, path]() { |
| FT_Error err = 0; |
| |
| err = FT_Activate_Size(unscaledFtSize.get()); |
| if (err != 0) { |
| return false; |
| } |
| |
| err = FT_Set_Char_Size(face, SkIntToFDot6(face->units_per_EM), |
| SkIntToFDot6(face->units_per_EM), 72, 72); |
| if (err != 0) { |
| return false; |
| } |
| |
| err = FT_Load_Glyph(face, glyphID, flags); |
| if (err != 0) { |
| path->reset(); |
| return false; |
| } |
| |
| if (!generateGlyphPathStatic(face, path)) { |
| path->reset(); |
| return false; |
| } |
| |
| return true; |
| }; |
| |
| bool path_generation_result = try_generate_path(); |
| |
| FT_Activate_Size(oldSize); |
| |
| return path_generation_result; |
| } |
| #endif |
| |
| } // namespace |
| |
| bool SkScalerContext_FreeType_Base::generateGlyphPath(FT_Face face, SkPath* path) { |
| return generateGlyphPathStatic(face, path); |
| } |
| |
| bool SkScalerContext_FreeType_Base::generateFacePath(FT_Face face, |
| SkGlyphID glyphID, |
| SkPath* path) { |
| return generateFacePathStatic(face, glyphID, path); |
| } |
