| /* |
| * 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 "src/ports/SkFontHost_FreeType_common.h" |
| |
| #include "include/core/SkBitmap.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkColor.h" |
| #include "include/core/SkDrawable.h" |
| #include "include/core/SkGraphics.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkOpenTypeSVGDecoder.h" |
| #include "include/core/SkPath.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "include/pathops/SkPathOps.h" |
| #include "include/private/SkColorData.h" |
| #include "include/private/base/SkTo.h" |
| #include "src/core/SkFDot6.h" |
| #include "src/core/SkSwizzlePriv.h" |
| |
| #include <algorithm> |
| #include <utility> |
| |
| #include <ft2build.h> |
| #include <freetype/freetype.h> |
| #include <freetype/ftbitmap.h> |
| #ifdef FT_COLOR_H |
| # include <freetype/ftcolor.h> |
| #endif |
| #include <freetype/ftimage.h> |
| #include <freetype/ftoutln.h> |
| #include <freetype/ftsizes.h> |
| // In the past, FT_GlyphSlot_Own_Bitmap was defined in this header file. |
| #include <freetype/ftsynth.h> |
| |
| using namespace skia_private; |
| |
| namespace { |
| [[maybe_unused]] static inline const constexpr bool kSkShowTextBlitCoverage = false; |
| } |
| |
| #if defined(FT_CONFIG_OPTION_SVG) |
| # include <freetype/otsvg.h> |
| #endif |
| |
| #ifdef TT_SUPPORT_COLRV1 |
| // FT_ClipBox and FT_Get_Color_Glyph_ClipBox introduced VER-2-11-0-18-g47cf8ebf4 |
| // FT_COLR_COMPOSITE_PLUS and renumbering introduced VER-2-11-0-21-ge40ae7569 |
| // FT_SIZEOF_LONG_LONG introduced VER-2-11-0-31-gffdac8d67 |
| // FT_PaintRadialGradient changed size and layout at VER-2-11-0-147-gd3d3ff76d |
| // FT_STATIC_CAST introduced VER-2-11-0-172-g9079c5d91 |
| // So undefine TT_SUPPORT_COLRV1 before 2.11.1 but not if FT_STATIC_CAST is defined. |
| #if (((FREETYPE_MAJOR) < 2) || \ |
| ((FREETYPE_MAJOR) == 2 && (FREETYPE_MINOR) < 11) || \ |
| ((FREETYPE_MAJOR) == 2 && (FREETYPE_MINOR) == 11 && (FREETYPE_PATCH) < 1)) && \ |
| !defined(FT_STATIC_CAST) |
| # undef TT_SUPPORT_COLRV1 |
| #else |
| # include "src/base/SkScopeExit.h" |
| #endif |
| #endif |
| |
| // FT_OUTLINE_OVERLAP was added in FreeType 2.10.3 |
| #ifndef FT_OUTLINE_OVERLAP |
| # define FT_OUTLINE_OVERLAP 0x40 |
| #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; |
| } |
| |
| // The stop_offset field is being upgraded to a larger representation in FreeType, and changed from |
| // 2.14 to 16.16. Adjust the shift factor depending on size type. |
| static_assert(sizeof(FT_Fixed) != sizeof(FT_F2Dot14)); |
| constexpr float kColorStopShift = |
| sizeof(FT_ColorStop::stop_offset) == sizeof(FT_F2Dot14) ? 1 << 14 : 1 << 16; |
| #endif |
| |
| namespace { |
| using SkUniqueFTSize = std::unique_ptr<FT_SizeRec, SkFunctionObject<FT_Done_Size>>; |
| |
| 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) { |
| if constexpr (kSkShowTextBlitCoverage) { |
| r = std::max(r, (U8CPU)0x40); |
| g = std::max(g, (U8CPU)0x40); |
| b = std::max(b, (U8CPU)0x40); |
| } |
| return SkPack888ToRGB16(r, g, b); |
| } |
| |
| uint16_t grayToRGB16(U8CPU gray) { |
| if constexpr (kSkShowTextBlitCoverage) { |
| gray = std::max(gray, (U8CPU)0x40); |
| } |
| 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); |
| if constexpr (kSkShowTextBlitCoverage) { |
| *(dst_row-1) = SkFourByteInterp256(*(dst_row-1), SK_ColorWHITE, 0x40); |
| } |
| } |
| 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 |
| |
| const uint16_t kForegroundColorPaletteIndex = 0xFFFF; |
| |
| // This linear interpolation is used for calculating a truncated color line in special edge cases. |
| // This interpolation needs to be kept in sync with what the gradient shader would normally do when |
| // truncating and drawing color lines. When drawing into N32 surfaces, this is expected to be true. |
| // If that changes, or if we support other color spaces in CPAL tables at some point, this needs to |
| // be looked at. |
| SkColor lerpSkColor(SkColor c0, SkColor c1, float t) { |
| // Due to the floating point calculation in the caller, when interpolating between very narrow |
| // stops, we may get values outside the interpolation range, guard against these. |
| if (t < 0) { |
| return c0; |
| } |
| if (t > 1) { |
| return c1; |
| } |
| const auto c0_4f = Sk4f_fromL32(c0), c1_4f = Sk4f_fromL32(c1), |
| c_4f = c0_4f + (c1_4f - c0_4f) * t; |
| |
| return Sk4f_toL32(c_4f); |
| } |
| |
| enum TruncateStops { |
| TruncateStart, |
| TruncateEnd |
| }; |
| |
| // Truncate a vector of color stops at a previously computed stop position and insert at that |
| // position the color interpolated between the surrounding stops. |
| void truncateToStopInterpolating(SkScalar zeroRadiusStop, |
| std::vector<SkColor>& colors, |
| std::vector<SkScalar>& stops, |
| TruncateStops truncateStops) { |
| if (stops.size() <= 1u || |
| zeroRadiusStop < stops.front() || stops.back() < zeroRadiusStop) |
| { |
| return; |
| } |
| |
| size_t afterIndex = (truncateStops == TruncateStart) |
| ? std::lower_bound(stops.begin(), stops.end(), zeroRadiusStop) - stops.begin() |
| : std::upper_bound(stops.begin(), stops.end(), zeroRadiusStop) - stops.begin(); |
| |
| const float t = (zeroRadiusStop - stops[afterIndex - 1]) / |
| (stops[afterIndex] - stops[afterIndex - 1]); |
| SkColor lerpColor = lerpSkColor(colors[afterIndex - 1], colors[afterIndex], t); |
| |
| if (truncateStops == TruncateStart) { |
| stops.erase(stops.begin(), stops.begin() + afterIndex); |
| colors.erase(colors.begin(), colors.begin() + afterIndex); |
| stops.insert(stops.begin(), 0); |
| colors.insert(colors.begin(), lerpColor); |
| } else { |
| stops.erase(stops.begin() + afterIndex, stops.end()); |
| colors.erase(colors.begin() + afterIndex, colors.end()); |
| stops.insert(stops.end(), 1); |
| colors.insert(colors.end(), lerpColor); |
| } |
| } |
| |
| struct OpaquePaintHasher { |
| size_t operator()(const FT_OpaquePaint& opaquePaint) { |
| return SkGoodHash()(opaquePaint.p) ^ |
| SkGoodHash()(opaquePaint.insert_root_transform); |
| } |
| }; |
| |
| using VisitedSet = THashSet<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 extendMode) { |
| switch (extendMode) { |
| 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 compositeMode) { |
| switch (compositeMode) { |
| 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_PLUS: |
| return SkBlendMode::kPlus; |
| 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) { |
| // 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 bNormalized = b; |
| bNormalized.normalize(); |
| bNormalized.scale(SkPoint::DotProduct(a, b) / length); |
| return bNormalized; |
| } |
| |
| bool colrv1_configure_skpaint(FT_Face face, |
| const SkSpan<SkColor>& palette, |
| const SkColor foregroundColor, |
| const FT_COLR_Paint& colrPaint, |
| SkPaint* paint) { |
| auto fetchColorStops = [&face, &palette, &foregroundColor]( |
| const FT_ColorStopIterator& colorStopIterator, |
| std::vector<SkScalar>& stops, |
| std::vector<SkColor>& colors) -> bool { |
| const FT_UInt colorStopCount = colorStopIterator.num_color_stops; |
| if (colorStopCount == 0) { |
| return false; |
| } |
| |
| // 5.7.11.2.4 ColorIndex, ColorStop and ColorLine |
| // "Applications shall apply the colorStops in increasing stopOffset order." |
| struct ColorStop { |
| SkScalar pos; |
| SkColor color; |
| }; |
| std::vector<ColorStop> colorStopsSorted; |
| colorStopsSorted.resize(colorStopCount); |
| |
| FT_ColorStop color_stop; |
| FT_ColorStopIterator mutable_color_stop_iterator = colorStopIterator; |
| while (FT_Get_Colorline_Stops(face, &color_stop, &mutable_color_stop_iterator)) { |
| FT_UInt index = mutable_color_stop_iterator.current_color_stop - 1; |
| colorStopsSorted[index].pos = color_stop.stop_offset / kColorStopShift; |
| FT_UInt16& palette_index = color_stop.color.palette_index; |
| if (palette_index == kForegroundColorPaletteIndex) { |
| U8CPU newAlpha = SkColorGetA(foregroundColor) * |
| SkColrV1AlphaToFloat(color_stop.color.alpha); |
| colorStopsSorted[index].color = SkColorSetA(foregroundColor, newAlpha); |
| } else if (palette_index >= palette.size()) { |
| return false; |
| } else { |
| U8CPU newAlpha = SkColorGetA(palette[palette_index]) * |
| SkColrV1AlphaToFloat(color_stop.color.alpha); |
| colorStopsSorted[index].color = SkColorSetA(palette[palette_index], newAlpha); |
| } |
| } |
| |
| std::stable_sort(colorStopsSorted.begin(), colorStopsSorted.end(), |
| [](const ColorStop& a, const ColorStop& b) { return a.pos < b.pos; }); |
| |
| stops.resize(colorStopCount); |
| colors.resize(colorStopCount); |
| for (size_t i = 0; i < colorStopCount; ++i) { |
| stops[i] = colorStopsSorted[i].pos; |
| colors[i] = colorStopsSorted[i].color; |
| } |
| return true; |
| }; |
| |
| switch (colrPaint.format) { |
| case FT_COLR_PAINTFORMAT_SOLID: { |
| FT_PaintSolid solid = colrPaint.u.solid; |
| |
| // Dont' draw anything with this color if the palette index is out of bounds. |
| SkColor color = SK_ColorTRANSPARENT; |
| if (solid.color.palette_index == kForegroundColorPaletteIndex) { |
| U8CPU newAlpha = SkColorGetA(foregroundColor) * |
| SkColrV1AlphaToFloat(solid.color.alpha); |
| color = SkColorSetA(foregroundColor, newAlpha); |
| } else if (solid.color.palette_index >= palette.size()) { |
| return false; |
| } else { |
| U8CPU newAlpha = SkColorGetA(palette[solid.color.palette_index]) * |
| SkColrV1AlphaToFloat(solid.color.alpha); |
| color = SkColorSetA(palette[solid.color.palette_index], newAlpha); |
| } |
| paint->setShader(nullptr); |
| paint->setColor(color); |
| return true; |
| } |
| case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT: { |
| const FT_PaintLinearGradient& linearGradient = colrPaint.u.linear_gradient; |
| std::vector<SkScalar> stops; |
| std::vector<SkColor> colors; |
| |
| if (!fetchColorStops(linearGradient.colorline.color_stop_iterator, stops, colors)) { |
| return false; |
| } |
| |
| if (stops.size() == 1) { |
| paint->setColor(colors[0]); |
| return true; |
| } |
| |
| SkPoint linePositions[2] = {SkPoint::Make( SkFixedToScalar(linearGradient.p0.x), |
| -SkFixedToScalar(linearGradient.p0.y)), |
| SkPoint::Make( SkFixedToScalar(linearGradient.p1.x), |
| -SkFixedToScalar(linearGradient.p1.y))}; |
| SkPoint p0 = linePositions[0]; |
| SkPoint p1 = linePositions[1]; |
| SkPoint p2 = SkPoint::Make( SkFixedToScalar(linearGradient.p2.x), |
| -SkFixedToScalar(linearGradient.p2.y)); |
| |
| // If p0p1 or p0p2 are degenerate probably nothing should be drawn. |
| // If p0p1 and p0p2 are parallel then one side is the first color and the other side is |
| // the last color, depending on the direction. |
| // For now, just use the first color. |
| if (p1 == p0 || p2 == p0 || !SkPoint::CrossProduct(p1 - p0, p2 - p0)) { |
| paint->setColor(colors[0]); |
| return true; |
| } |
| |
| // Follow implementation note in nanoemoji: |
| // https://github.com/googlefonts/nanoemoji/blob/0ac6e7bb4d8202db692574d8530a9b643f1b3b3c/src/nanoemoji/svg.py#L188 |
| // to compute a new gradient end point P3 as the orthogonal |
| // projection of the vector from p0 to p1 onto a line perpendicular |
| // to line p0p2 and passing through p0. |
| SkVector perpendicularToP2P0 = (p2 - p0); |
| perpendicularToP2P0 = SkPoint::Make( perpendicularToP2P0.y(), |
| -perpendicularToP2P0.x()); |
| SkVector p3 = p0 + SkVectorProjection((p1 - p0), perpendicularToP2P0); |
| linePositions[1] = p3; |
| |
| // Project/scale points according to stop extrema along p0p3 line, |
| // p3 being the result of the projection above, 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. |
| SkTileMode tileMode = ToSkTileMode(linearGradient.colorline.extend); |
| SkScalar colorStopRange = stops.back() - stops.front(); |
| // If the color stops are all at the same offset position, repeat and reflect modes |
| // become meaningless. |
| if (colorStopRange == 0.f) { |
| if (tileMode != SkTileMode::kClamp) { |
| paint->setColor(SK_ColorTRANSPARENT); |
| return true; |
| } else { |
| // Insert duplicated fake color stop in pad case at +1.0f to enable the projection |
| // of circles for an originally 0-length color stop range. Adding this stop will |
| // paint the equivalent gradient, because: All font specified color stops are in the |
| // same spot, mode is pad, so everything before this spot is painted with the first |
| // color, everything after this spot is painted with the last color. Not adding this |
| // stop will skip the projection and result in specifying non-normalized color stops |
| // to the shader. |
| stops.push_back(stops.back() + 1.0f); |
| colors.push_back(colors.back()); |
| colorStopRange = 1.0f; |
| } |
| } |
| SkASSERT(colorStopRange != 0.f); |
| |
| // If the colorStopRange is 0 at this point, the default behavior of the shader is to |
| // clamp to 1 color stops that are above 1, clamp to 0 for color stops that are below 0, |
| // and repeat the outer color stops at 0 and 1 if the color stops are inside the |
| // range. That will result in the correct rendering. |
| if ((colorStopRange != 1 || stops.front() != 0.f)) { |
| SkVector p0p3 = p3 - p0; |
| SkVector p0Offset = p0p3; |
| p0Offset.scale(stops.front()); |
| SkVector p1Offset = p0p3; |
| p1Offset.scale(stops.back()); |
| |
| linePositions[0] = p0 + p0Offset; |
| linePositions[1] = p0 + p1Offset; |
| |
| SkScalar scaleFactor = 1 / colorStopRange; |
| SkScalar startOffset = stops.front(); |
| for (SkScalar& stop : stops) { |
| stop = (stop - startOffset) * scaleFactor; |
| } |
| } |
| |
| sk_sp<SkShader> shader(SkGradientShader::MakeLinear( |
| linePositions, |
| colors.data(), stops.data(), stops.size(), |
| tileMode)); |
| SkASSERT(shader); |
| // An opaque color is needed to ensure the gradient is not modulated by alpha. |
| paint->setColor(SK_ColorBLACK); |
| paint->setShader(shader); |
| return true; |
| } |
| case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT: { |
| const FT_PaintRadialGradient& radialGradient = colrPaint.u.radial_gradient; |
| SkPoint start = SkPoint::Make( SkFixedToScalar(radialGradient.c0.x), |
| -SkFixedToScalar(radialGradient.c0.y)); |
| SkScalar startRadius = SkFixedToScalar(radialGradient.r0); |
| SkPoint end = SkPoint::Make( SkFixedToScalar(radialGradient.c1.x), |
| -SkFixedToScalar(radialGradient.c1.y)); |
| SkScalar endRadius = SkFixedToScalar(radialGradient.r1); |
| |
| |
| std::vector<SkScalar> stops; |
| std::vector<SkColor> colors; |
| if (!fetchColorStops(radialGradient.colorline.color_stop_iterator, stops, colors)) { |
| return false; |
| } |
| |
| if (stops.size() == 1) { |
| paint->setColor(colors[0]); |
| return true; |
| } |
| |
| SkScalar colorStopRange = stops.back() - stops.front(); |
| SkTileMode tileMode = ToSkTileMode(radialGradient.colorline.extend); |
| |
| if (colorStopRange == 0.f) { |
| if (tileMode != SkTileMode::kClamp) { |
| paint->setColor(SK_ColorTRANSPARENT); |
| return true; |
| } else { |
| // Insert duplicated fake color stop in pad case at +1.0f to enable the projection |
| // of circles for an originally 0-length color stop range. Adding this stop will |
| // paint the equivalent gradient, because: All font specified color stops are in the |
| // same spot, mode is pad, so everything before this spot is painted with the first |
| // color, everything after this spot is painted with the last color. Not adding this |
| // stop will skip the projection and result in specifying non-normalized color stops |
| // to the shader. |
| stops.push_back(stops.back() + 1.0f); |
| colors.push_back(colors.back()); |
| colorStopRange = 1.0f; |
| } |
| } |
| SkASSERT(colorStopRange != 0.f); |
| |
| // If the colorStopRange is 0 at this point, the default behavior of the shader is to |
| // clamp to 1 color stops that are above 1, clamp to 0 for color stops that are below 0, |
| // and repeat the outer color stops at 0 and 1 if the color stops are inside the |
| // range. That will result in the correct rendering. |
| if (colorStopRange != 1 || stops.front() != 0.f) { |
| // For the Skia two-point caonical shader to understand the |
| // COLRv1 color stops we need to scale stops to 0 to 1 range and |
| // interpolate new centers and radii. Otherwise the shader |
| // clamps stops outside the range to 0 and 1 (larger interval) |
| // or repeats the outer stops at 0 and 1 if the (smaller |
| // interval). |
| SkVector startToEnd = end - start; |
| SkScalar radiusDiff = endRadius - startRadius; |
| SkScalar scaleFactor = 1 / colorStopRange; |
| SkScalar stopsStartOffset = stops.front(); |
| |
| SkVector startOffset = startToEnd; |
| startOffset.scale(stops.front()); |
| SkVector endOffset = startToEnd; |
| endOffset.scale(stops.back()); |
| |
| // The order of the following computations is important in order to avoid |
| // overwriting start or startRadius before the second reassignment. |
| end = start + endOffset; |
| start = start + startOffset; |
| endRadius = startRadius + radiusDiff * stops.back(); |
| startRadius = startRadius + radiusDiff * stops.front(); |
| |
| for (auto& stop : stops) { |
| stop = (stop - stopsStartOffset) * scaleFactor; |
| } |
| } |
| |
| // For negative radii, interpolation is needed to prepare parameters suitable |
| // for invoking the shader. Implementation below as resolution discussed in |
| // https://github.com/googlefonts/colr-gradients-spec/issues/367. |
| // Truncate to manually interpolated color for tile mode clamp, otherwise |
| // calculate positive projected circles. |
| if (startRadius < 0 || endRadius < 0) { |
| if (startRadius == endRadius && startRadius < 0) { |
| paint->setColor(SK_ColorTRANSPARENT); |
| return true; |
| } |
| |
| if (tileMode == SkTileMode::kClamp) { |
| SkVector startToEnd = end - start; |
| SkScalar radiusDiff = endRadius - startRadius; |
| SkScalar zeroRadiusStop = 0.f; |
| TruncateStops truncateSide = TruncateStart; |
| if (startRadius < 0) { |
| truncateSide = TruncateStart; |
| |
| // Compute color stop position where radius is = 0. After the scaling |
| // of stop positions to the normal 0,1 range that we have done above, |
| // the size of the radius as a function of the color stops is: r(x) = r0 |
| // + x*(r1-r0) Solving this function for r(x) = 0, we get: x = -r0 / |
| // (r1-r0) |
| zeroRadiusStop = -startRadius / (endRadius - startRadius); |
| startRadius = 0.f; |
| SkVector startEndDiff = end - start; |
| startEndDiff.scale(zeroRadiusStop); |
| start = start + startEndDiff; |
| } |
| |
| if (endRadius < 0) { |
| truncateSide = TruncateEnd; |
| zeroRadiusStop = -startRadius / (endRadius - startRadius); |
| endRadius = 0.f; |
| SkVector startEndDiff = end - start; |
| startEndDiff.scale(1 - zeroRadiusStop); |
| end = end - startEndDiff; |
| } |
| |
| if (!(startRadius == 0 && endRadius == 0)) { |
| truncateToStopInterpolating( |
| zeroRadiusStop, colors, stops, truncateSide); |
| } else { |
| // If both radii have become negative and where clamped to 0, we need to |
| // produce a single color cone, otherwise the shader colors the whole |
| // plane in a single color when two radii are specified as 0. |
| if (radiusDiff > 0) { |
| end = start + startToEnd; |
| endRadius = radiusDiff; |
| colors.erase(colors.begin(), colors.end() - 1); |
| stops.erase(stops.begin(), stops.end() - 1); |
| } else { |
| start -= startToEnd; |
| startRadius = -radiusDiff; |
| colors.erase(colors.begin() + 1, colors.end()); |
| stops.erase(stops.begin() + 1, stops.end()); |
| } |
| } |
| } else { |
| if (startRadius < 0 || endRadius < 0) { |
| auto roundIntegerMultiple = [](SkScalar factorZeroCrossing, |
| SkTileMode tileMode) { |
| int roundedMultiple = factorZeroCrossing > 0 |
| ? ceilf(factorZeroCrossing) |
| : floorf(factorZeroCrossing) - 1; |
| if (tileMode == SkTileMode::kMirror && roundedMultiple % 2 != 0) { |
| roundedMultiple += roundedMultiple < 0 ? -1 : 1; |
| } |
| return roundedMultiple; |
| }; |
| |
| SkVector startToEnd = end - start; |
| SkScalar radiusDiff = endRadius - startRadius; |
| SkScalar factorZeroCrossing = (startRadius / (startRadius - endRadius)); |
| bool inRange = 0.f <= factorZeroCrossing && factorZeroCrossing <= 1.0f; |
| SkScalar direction = inRange && radiusDiff < 0 ? -1.0f : 1.0f; |
| SkScalar circleProjectionFactor = |
| roundIntegerMultiple(factorZeroCrossing * direction, tileMode); |
| startToEnd.scale(circleProjectionFactor); |
| startRadius += circleProjectionFactor * radiusDiff; |
| endRadius += circleProjectionFactor * radiusDiff; |
| start += startToEnd; |
| end += startToEnd; |
| } |
| } |
| } |
| |
| // An opaque color is needed to ensure the gradient is not modulated by alpha. |
| paint->setColor(SK_ColorBLACK); |
| |
| paint->setShader(SkGradientShader::MakeTwoPointConical( |
| start, startRadius, end, endRadius, colors.data(), stops.data(), stops.size(), |
| tileMode)); |
| return true; |
| } |
| case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT: { |
| const FT_PaintSweepGradient& sweepGradient = colrPaint.u.sweep_gradient; |
| SkPoint center = SkPoint::Make( SkFixedToScalar(sweepGradient.center.x), |
| -SkFixedToScalar(sweepGradient.center.y)); |
| |
| |
| SkScalar startAngle = SkFixedToScalar(sweepGradient.start_angle * 180.0f); |
| SkScalar endAngle = SkFixedToScalar(sweepGradient.end_angle * 180.0f); |
| // OpenType 1.9.1 adds a shift to the angle to ease specification of a 0 to 360 |
| // degree sweep. |
| startAngle += 180.0f; |
| endAngle += 180.0f; |
| |
| std::vector<SkScalar> stops; |
| std::vector<SkColor> colors; |
| if (!fetchColorStops(sweepGradient.colorline.color_stop_iterator, stops, colors)) { |
| return false; |
| } |
| |
| if (stops.size() == 1) { |
| paint->setColor(colors[0]); |
| return true; |
| } |
| |
| // An opaque color is needed to ensure the gradient is not modulated by alpha. |
| paint->setColor(SK_ColorBLACK); |
| |
| // New (Var)SweepGradient implementation compliant with OpenType 1.9.1 from here. |
| |
| // The shader expects stops from 0 to 1, so we need to account for |
| // minimum and maximum stop positions being different from 0 and |
| // 1. We do that by scaling minimum and maximum stop positions to |
| // the 0 to 1 interval and scaling the angles inverse proportionally. |
| |
| // 1) Scale angles to their equivalent positions if stops were from 0 to 1. |
| |
| SkScalar sectorAngle = endAngle - startAngle; |
| SkTileMode tileMode = ToSkTileMode(sweepGradient.colorline.extend); |
| if (sectorAngle == 0 && tileMode != SkTileMode::kClamp) { |
| // "If the ColorLine's extend mode is reflect or repeat and start and end angle |
| // are equal, nothing is drawn.". |
| paint->setColor(SK_ColorTRANSPARENT); |
| return true; |
| } |
| |
| |
| SkScalar startAngleScaled = startAngle + sectorAngle * stops.front(); |
| SkScalar endAngleScaled = startAngle + sectorAngle * stops.back(); |
| |
| // 2) Scale stops accordingly to 0 to 1 range. |
| |
| float colorStopRange = stops.back() - stops.front(); |
| bool colorStopInserted = false; |
| if (colorStopRange == 0.f) { |
| if (tileMode != SkTileMode::kClamp) { |
| paint->setColor(SK_ColorTRANSPARENT); |
| return true; |
| } else { |
| // Insert duplicated fake color stop in pad case at +1.0f to feed the shader correct |
| // values and enable painting a pad sweep gradient with two colors. Adding this stop |
| // will paint the equivalent gradient, because: All font specified color stops are |
| // in the same spot, mode is pad, so everything before this spot is painted with the |
| // first color, everything after this spot is painted with the last color. Not |
| // adding this stop will skip the projection and result in specifying non-normalized |
| // color stops to the shader. |
| stops.push_back(stops.back() + 1.0f); |
| colors.push_back(colors.back()); |
| colorStopRange = 1.0f; |
| colorStopInserted = true; |
| } |
| } |
| |
| SkScalar scaleFactor = 1 / colorStopRange; |
| SkScalar startOffset = stops.front(); |
| |
| for (SkScalar& stop : stops) { |
| stop = (stop - startOffset) * scaleFactor; |
| } |
| |
| /* https://docs.microsoft.com/en-us/typography/opentype/spec/colr#sweep-gradients |
| * "The angles are expressed in counter-clockwise degrees from |
| * the direction of the positive x-axis on the design |
| * grid. [...] The color line progresses from the start angle |
| * to the end angle in the counter-clockwise direction;" - |
| * Convert angles and stops from counter-clockwise to clockwise |
| * for the shader if the gradient is not already reversed due to |
| * start angle being larger than end angle. */ |
| startAngleScaled = 360.f - startAngleScaled; |
| endAngleScaled = 360.f - endAngleScaled; |
| if (startAngleScaled > endAngleScaled || |
| (startAngleScaled == endAngleScaled && !colorStopInserted)) { |
| std::swap(startAngleScaled, endAngleScaled); |
| std::reverse(stops.begin(), stops.end()); |
| std::reverse(colors.begin(), colors.end()); |
| for (auto& stop : stops) { |
| stop = 1.0f - stop; |
| } |
| } |
| |
| paint->setShader(SkGradientShader::MakeSweep(center.x(), center.y(), |
| colors.data(), |
| stops.data(), stops.size(), |
| tileMode, |
| startAngleScaled, |
| endAngleScaled, |
| 0, nullptr)); |
| return true; |
| } |
| default: { |
| SkASSERT(false); |
| return false; |
| } |
| } |
| SkUNREACHABLE; |
| } |
| |
| bool colrv1_draw_paint(SkCanvas* canvas, |
| const SkSpan<SkColor>& palette, |
| const SkColor foregroundColor, |
| FT_Face face, |
| const FT_COLR_Paint& colrPaint) { |
| switch (colrPaint.format) { |
| case FT_COLR_PAINTFORMAT_GLYPH: { |
| FT_UInt glyphID = colrPaint.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)) { |
| return false; |
| } |
| if constexpr (kSkShowTextBlitCoverage) { |
| SkPaint highlight_paint; |
| highlight_paint.setColor(0x33FF0000); |
| canvas->drawRect(path.getBounds(), highlight_paint); |
| } |
| canvas->clipPath(path, true /* doAntiAlias */); |
| return true; |
| } |
| case FT_COLR_PAINTFORMAT_SOLID: |
| case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT: |
| case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT: |
| case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT: { |
| SkPaint skPaint; |
| if (!colrv1_configure_skpaint(face, palette, foregroundColor, colrPaint, &skPaint)) { |
| return false; |
| } |
| canvas->drawPaint(skPaint); |
| return true; |
| } |
| case FT_COLR_PAINTFORMAT_TRANSFORM: |
| case FT_COLR_PAINTFORMAT_TRANSLATE: |
| case FT_COLR_PAINTFORMAT_SCALE: |
| case FT_COLR_PAINTFORMAT_ROTATE: |
| case FT_COLR_PAINTFORMAT_SKEW: |
| [[fallthrough]]; // Transforms handled in colrv1_transform. |
| default: |
| SkASSERT(false); |
| return false; |
| } |
| SkUNREACHABLE; |
| } |
| |
| bool colrv1_draw_glyph_with_path(SkCanvas* canvas, |
| const SkSpan<SkColor>& palette, SkColor foregroundColor, |
| FT_Face face, |
| const FT_COLR_Paint& glyphPaint, const 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); |
| if (!colrv1_configure_skpaint(face, palette, foregroundColor, fillPaint, &skiaFillPaint)) { |
| return false; |
| } |
| |
| 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)) { |
| return false; |
| } |
| if constexpr (kSkShowTextBlitCoverage) { |
| SkPaint highlightPaint; |
| highlightPaint.setColor(0x33FF0000); |
| canvas->drawRect(path.getBounds(), highlightPaint); |
| } |
| canvas->drawPath(path, skiaFillPaint); |
| return true; |
| } |
| |
| |
| /* In drawing mode, concatenates the transforms directly on SkCanvas. In |
| * bounding box calculation mode, no SkCanvas is specified, but we only want to |
| * retrieve the transform from the FreeType paint object. */ |
| void colrv1_transform(FT_Face face, |
| const FT_COLR_Paint& colrPaint, |
| SkCanvas* canvas, |
| SkMatrix* outTransform = nullptr) { |
| SkMatrix transform; |
| |
| SkASSERT(canvas || outTransform); |
| |
| switch (colrPaint.format) { |
| case FT_COLR_PAINTFORMAT_TRANSFORM: { |
| transform = ToSkMatrix(colrPaint.u.transform.affine); |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_TRANSLATE: { |
| transform = SkMatrix::Translate( SkFixedToScalar(colrPaint.u.translate.dx), |
| -SkFixedToScalar(colrPaint.u.translate.dy)); |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_SCALE: { |
| transform.setScale( SkFixedToScalar(colrPaint.u.scale.scale_x), |
| SkFixedToScalar(colrPaint.u.scale.scale_y), |
| SkFixedToScalar(colrPaint.u.scale.center_x), |
| -SkFixedToScalar(colrPaint.u.scale.center_y)); |
| break; |
| } |
| case FT_COLR_PAINTFORMAT_ROTATE: { |
| // COLRv1 angles are counter-clockwise, compare |
| // https://docs.microsoft.com/en-us/typography/opentype/spec/colr#formats-24-to-27-paintrotate-paintvarrotate-paintrotatearoundcenter-paintvarrotatearoundcenter |
| transform = SkMatrix::RotateDeg( |
| -SkFixedToScalar(colrPaint.u.rotate.angle) * 180.0f, |
| SkPoint::Make( SkFixedToScalar(colrPaint.u.rotate.center_x), |
| -SkFixedToScalar(colrPaint.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 xDeg = SkFixedToScalar(colrPaint.u.skew.x_skew_angle) * 180.0f; |
| SkScalar xRad = SkDegreesToRadians(xDeg); |
| SkScalar xTan = SkScalarTan(xRad); |
| xTan = SkScalarNearlyZero(xTan) ? 0.0f : xTan; |
| |
| SkScalar yDeg = SkFixedToScalar(colrPaint.u.skew.y_skew_angle) * 180.0f; |
| // Negate y_skew_angle due to Skia's y-down coordinate system to achieve |
| // counter-clockwise skew along the y-axis. |
| SkScalar yRad = SkDegreesToRadians(-yDeg); |
| SkScalar yTan = SkScalarTan(yRad); |
| yTan = SkScalarNearlyZero(yTan) ? 0.0f : yTan; |
| |
| transform.setSkew(xTan, yTan, |
| SkFixedToScalar(colrPaint.u.skew.center_x), |
| -SkFixedToScalar(colrPaint.u.skew.center_y)); |
| break; |
| } |
| default: { |
| SkASSERT(false); // Only transforms are handled in this function. |
| } |
| } |
| if (canvas) { |
| canvas->concat(transform); |
| } |
| if (outTransform) { |
| *outTransform = transform; |
| } |
| } |
| |
| bool colrv1_start_glyph(SkCanvas* canvas, |
| const SkSpan<SkColor>& palette, |
| const SkColor foregroundColor, |
| FT_Face face, |
| uint16_t glyphId, |
| FT_Color_Root_Transform rootTransform, |
| VisitedSet* activePaints); |
| |
| bool colrv1_traverse_paint(SkCanvas* canvas, |
| const SkSpan<SkColor>& palette, |
| const SkColor foregroundColor, |
| FT_Face face, |
| FT_OpaquePaint opaquePaint, |
| VisitedSet* activePaints) { |
| // Cycle detection, see section "5.7.11.1.9 Color glyphs as a directed acyclic graph". |
| if (activePaints->contains(opaquePaint)) { |
| return false; |
| } |
| |
| activePaints->add(opaquePaint); |
| SK_AT_SCOPE_EXIT(activePaints->remove(opaquePaint)); |
| |
| FT_COLR_Paint paint; |
| if (!FT_Get_Paint(face, opaquePaint, &paint)) { |
| return false; |
| } |
| |
| SkAutoCanvasRestore autoRestore(canvas, true /* doSave */); |
| switch (paint.format) { |
| case FT_COLR_PAINTFORMAT_COLR_LAYERS: { |
| FT_LayerIterator& layerIterator = paint.u.colr_layers.layer_iterator; |
| FT_OpaquePaint layerPaint{nullptr, 1}; |
| while (FT_Get_Paint_Layers(face, &layerIterator, &layerPaint)) { |
| if (!colrv1_traverse_paint(canvas, palette, foregroundColor, face, |
| layerPaint, activePaints)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| 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) |
| { |
| return colrv1_draw_glyph_with_path(canvas, palette, foregroundColor, |
| face, paint, fillPaint); |
| } |
| if (!colrv1_draw_paint(canvas, palette, foregroundColor, face, paint)) { |
| return false; |
| } |
| return colrv1_traverse_paint(canvas, palette, foregroundColor, |
| face, paint.u.glyph.paint, activePaints); |
| case FT_COLR_PAINTFORMAT_COLR_GLYPH: |
| return colrv1_start_glyph(canvas, palette, foregroundColor, |
| face, paint.u.colr_glyph.glyphID, FT_COLOR_NO_ROOT_TRANSFORM, |
| activePaints); |
| case FT_COLR_PAINTFORMAT_TRANSFORM: |
| colrv1_transform(face, paint, canvas); |
| return colrv1_traverse_paint(canvas, palette, foregroundColor, |
| face, paint.u.transform.paint, activePaints); |
| case FT_COLR_PAINTFORMAT_TRANSLATE: |
| colrv1_transform(face, paint, canvas); |
| return colrv1_traverse_paint(canvas, palette, foregroundColor, |
| face, paint.u.translate.paint, activePaints); |
| case FT_COLR_PAINTFORMAT_SCALE: |
| colrv1_transform(face, paint, canvas); |
| return colrv1_traverse_paint(canvas, palette, foregroundColor, |
| face, paint.u.scale.paint, activePaints); |
| case FT_COLR_PAINTFORMAT_ROTATE: |
| colrv1_transform(face, paint, canvas); |
| return colrv1_traverse_paint(canvas, palette, foregroundColor, |
| face, paint.u.rotate.paint, activePaints); |
| case FT_COLR_PAINTFORMAT_SKEW: |
| colrv1_transform(face, paint, canvas); |
| return colrv1_traverse_paint(canvas, palette, foregroundColor, |
| face, paint.u.skew.paint, activePaints); |
| case FT_COLR_PAINTFORMAT_COMPOSITE: { |
| SkAutoCanvasRestore acr(canvas, false); |
| canvas->saveLayer(nullptr, nullptr); |
| if (!colrv1_traverse_paint(canvas, palette, foregroundColor, |
| face, paint.u.composite.backdrop_paint, activePaints)) { |
| return false; |
| } |
| SkPaint blendModePaint; |
| blendModePaint.setBlendMode(ToSkBlendMode(paint.u.composite.composite_mode)); |
| canvas->saveLayer(nullptr, &blendModePaint); |
| return colrv1_traverse_paint(canvas, palette, foregroundColor, |
| face, paint.u.composite.source_paint, activePaints); |
| } |
| case FT_COLR_PAINTFORMAT_SOLID: |
| case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT: |
| case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT: |
| case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT: { |
| return colrv1_draw_paint(canvas, palette, foregroundColor, face, paint); |
| } |
| default: |
| SkASSERT(false); |
| return false; |
| } |
| SkUNREACHABLE; |
| } |
| |
| SkPath GetClipBoxPath(FT_Face face, uint16_t glyphId, bool untransformed) { |
| SkPath resultPath; |
| SkUniqueFTSize unscaledFtSize = nullptr; |
| FT_Size oldSize = face->size; |
| FT_Matrix oldTransform; |
| FT_Vector oldDelta; |
| FT_Error err = 0; |
| |
| if (untransformed) { |
| unscaledFtSize.reset( |
| [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 resultPath; |
| } |
| |
| err = FT_Activate_Size(unscaledFtSize.get()); |
| if (err != 0) { |
| return resultPath; |
| } |
| |
| err = FT_Set_Char_Size(face, SkIntToFDot6(face->units_per_EM), 0, 0, 0); |
| if (err != 0) { |
| return resultPath; |
| } |
| |
| FT_Get_Transform(face, &oldTransform, &oldDelta); |
| FT_Set_Transform(face, nullptr, nullptr); |
| } |
| |
| FT_ClipBox colrGlyphClipBox; |
| if (FT_Get_Color_Glyph_ClipBox(face, glyphId, &colrGlyphClipBox)) { |
| resultPath = SkPath::Polygon({{ SkFDot6ToScalar(colrGlyphClipBox.bottom_left.x), |
| -SkFDot6ToScalar(colrGlyphClipBox.bottom_left.y)}, |
| { SkFDot6ToScalar(colrGlyphClipBox.top_left.x), |
| -SkFDot6ToScalar(colrGlyphClipBox.top_left.y)}, |
| { SkFDot6ToScalar(colrGlyphClipBox.top_right.x), |
| -SkFDot6ToScalar(colrGlyphClipBox.top_right.y)}, |
| { SkFDot6ToScalar(colrGlyphClipBox.bottom_right.x), |
| -SkFDot6ToScalar(colrGlyphClipBox.bottom_right.y)}}, |
| true); |
| } |
| |
| if (untransformed) { |
| err = FT_Activate_Size(oldSize); |
| if (err != 0) { |
| return resultPath; |
| } |
| FT_Set_Transform(face, &oldTransform, &oldDelta); |
| } |
| |
| return resultPath; |
| } |
| |
| bool colrv1_start_glyph(SkCanvas* canvas, |
| const SkSpan<SkColor>& palette, |
| const SkColor foregroundColor, |
| FT_Face face, |
| uint16_t glyphId, |
| FT_Color_Root_Transform rootTransform, |
| VisitedSet* activePaints) { |
| FT_OpaquePaint opaquePaint{nullptr, 1}; |
| if (!FT_Get_Color_Glyph_Paint(face, glyphId, rootTransform, &opaquePaint)) { |
| return false; |
| } |
| |
| bool untransformed = rootTransform == FT_COLOR_NO_ROOT_TRANSFORM; |
| SkPath clipBoxPath = GetClipBoxPath(face, glyphId, untransformed); |
| if (!clipBoxPath.isEmpty()) { |
| canvas->clipPath(clipBoxPath, true); |
| } |
| |
| if (!colrv1_traverse_paint(canvas, palette, foregroundColor, |
| face, opaquePaint, activePaints)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool colrv1_start_glyph_bounds(SkMatrix *ctm, |
| SkRect* bounds, |
| FT_Face face, |
| uint16_t glyphId, |
| FT_Color_Root_Transform rootTransform, |
| VisitedSet* activePaints); |
| |
| bool colrv1_traverse_paint_bounds(SkMatrix* ctm, |
| SkRect* bounds, |
| FT_Face face, |
| FT_OpaquePaint opaquePaint, |
| VisitedSet* activePaints) { |
| // Cycle detection, see section "5.7.11.1.9 Color glyphs as a directed acyclic graph". |
| if (activePaints->contains(opaquePaint)) { |
| return false; |
| } |
| |
| activePaints->add(opaquePaint); |
| SK_AT_SCOPE_EXIT(activePaints->remove(opaquePaint)); |
| |
| FT_COLR_Paint paint; |
| if (!FT_Get_Paint(face, opaquePaint, &paint)) { |
| return false; |
| } |
| |
| SkMatrix restoreMatrix = *ctm; |
| SK_AT_SCOPE_EXIT(*ctm = restoreMatrix); |
| |
| switch (paint.format) { |
| case FT_COLR_PAINTFORMAT_COLR_LAYERS: { |
| FT_LayerIterator& layerIterator = paint.u.colr_layers.layer_iterator; |
| FT_OpaquePaint layerPaint{nullptr, 1}; |
| while (FT_Get_Paint_Layers(face, &layerIterator, &layerPaint)) { |
| if (!colrv1_traverse_paint_bounds(ctm, bounds, face, layerPaint, activePaints)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| case FT_COLR_PAINTFORMAT_GLYPH: { |
| FT_UInt glyphID = paint.u.glyph.glyphID; |
| SkPath path; |
| if (!generateFacePathCOLRv1(face, glyphID, &path)) { |
| return false; |
| } |
| path.transform(*ctm); |
| bounds->join(path.getBounds()); |
| return true; |
| } |
| case FT_COLR_PAINTFORMAT_COLR_GLYPH: { |
| FT_UInt glyphID = paint.u.colr_glyph.glyphID; |
| return colrv1_start_glyph_bounds(ctm, bounds, face, glyphID, FT_COLOR_NO_ROOT_TRANSFORM, |
| activePaints); |
| } |
| case FT_COLR_PAINTFORMAT_TRANSFORM: { |
| SkMatrix transformMatrix; |
| colrv1_transform(face, paint, nullptr, &transformMatrix); |
| ctm->preConcat(transformMatrix); |
| FT_OpaquePaint& transformPaint = paint.u.transform.paint; |
| return colrv1_traverse_paint_bounds(ctm, bounds, face, transformPaint, activePaints); |
| } |
| case FT_COLR_PAINTFORMAT_TRANSLATE: { |
| SkMatrix transformMatrix; |
| colrv1_transform(face, paint, nullptr, &transformMatrix); |
| ctm->preConcat(transformMatrix); |
| FT_OpaquePaint& translatePaint = paint.u.translate.paint; |
| return colrv1_traverse_paint_bounds(ctm, bounds, face, translatePaint, activePaints); |
| } |
| case FT_COLR_PAINTFORMAT_SCALE: { |
| SkMatrix transformMatrix; |
| colrv1_transform(face, paint, nullptr, &transformMatrix); |
| ctm->preConcat(transformMatrix); |
| FT_OpaquePaint& scalePaint = paint.u.scale.paint; |
| return colrv1_traverse_paint_bounds(ctm, bounds, face, scalePaint, activePaints); |
| } |
| case FT_COLR_PAINTFORMAT_ROTATE: { |
| SkMatrix transformMatrix; |
| colrv1_transform(face, paint, nullptr, &transformMatrix); |
| ctm->preConcat(transformMatrix); |
| FT_OpaquePaint& rotatePaint = paint.u.rotate.paint; |
| return colrv1_traverse_paint_bounds(ctm, bounds, face, rotatePaint, activePaints); |
| } |
| case FT_COLR_PAINTFORMAT_SKEW: { |
| SkMatrix transformMatrix; |
| colrv1_transform(face, paint, nullptr, &transformMatrix); |
| ctm->preConcat(transformMatrix); |
| FT_OpaquePaint& skewPaint = paint.u.skew.paint; |
| return colrv1_traverse_paint_bounds(ctm, bounds, face, skewPaint, activePaints); |
| } |
| case FT_COLR_PAINTFORMAT_COMPOSITE: { |
| FT_OpaquePaint& backdropPaint = paint.u.composite.backdrop_paint; |
| FT_OpaquePaint& sourcePaint = paint.u.composite. source_paint; |
| return colrv1_traverse_paint_bounds(ctm, bounds, face, backdropPaint, activePaints) && |
| colrv1_traverse_paint_bounds(ctm, bounds, face, sourcePaint, activePaints); |
| } |
| case FT_COLR_PAINTFORMAT_SOLID: |
| case FT_COLR_PAINTFORMAT_LINEAR_GRADIENT: |
| case FT_COLR_PAINTFORMAT_RADIAL_GRADIENT: |
| case FT_COLR_PAINTFORMAT_SWEEP_GRADIENT: { |
| return true; |
| } |
| default: |
| SkASSERT(false); |
| return false; |
| } |
| SkUNREACHABLE; |
| } |
| |
| |
| bool colrv1_start_glyph_bounds(SkMatrix *ctm, |
| SkRect* bounds, |
| FT_Face face, |
| uint16_t glyphId, |
| FT_Color_Root_Transform rootTransform, |
| VisitedSet* activePaints) { |
| FT_OpaquePaint opaquePaint{nullptr, 1}; |
| return FT_Get_Color_Glyph_Paint(face, glyphId, rootTransform, &opaquePaint) && |
| colrv1_traverse_paint_bounds(ctm, bounds, face, opaquePaint, activePaints); |
| } |
| #endif // TT_SUPPORT_COLRV1 |
| |
| } // namespace |
| |
| |
| #ifdef TT_SUPPORT_COLRV1 |
| bool SkScalerContext_FreeType_Base::drawCOLRv1Glyph(FT_Face face, |
| const SkGlyph& glyph, |
| uint32_t loadGlyphFlags, |
| SkSpan<SkColor> palette, |
| SkCanvas* canvas) { |
| if (this->isSubpixel()) { |
| canvas->translate(SkFixedToScalar(glyph.getSubXFixed()), |
| SkFixedToScalar(glyph.getSubYFixed())); |
| } |
| |
| VisitedSet activePaints; |
| bool haveLayers = colrv1_start_glyph(canvas, palette, |
| fRec.fForegroundColor, |
| face, glyph.getGlyphID(), |
| FT_COLOR_INCLUDE_ROOT_TRANSFORM, |
| &activePaints); |
| SkASSERTF(haveLayers, "Could not get COLRv1 layers from '%s'.", face->family_name); |
| return haveLayers; |
| } |
| #endif // TT_SUPPORT_COLRV1 |
| |
| #ifdef FT_COLOR_H |
| bool SkScalerContext_FreeType_Base::drawCOLRv0Glyph(FT_Face face, |
| const SkGlyph& glyph, |
| uint32_t loadGlyphFlags, |
| SkSpan<SkColor> palette, |
| SkCanvas* canvas) { |
| if (this->isSubpixel()) { |
| canvas->translate(SkFixedToScalar(glyph.getSubXFixed()), |
| SkFixedToScalar(glyph.getSubYFixed())); |
| } |
| |
| bool haveLayers = false; |
| FT_LayerIterator layerIterator; |
| layerIterator.p = nullptr; |
| FT_UInt layerGlyphIndex = 0; |
| FT_UInt layerColorIndex = 0; |
| SkPaint paint; |
| paint.setAntiAlias(!(loadGlyphFlags & FT_LOAD_TARGET_MONO)); |
| while (FT_Get_Color_Glyph_Layer(face, glyph.getGlyphID(), &layerGlyphIndex, |
| &layerColorIndex, &layerIterator)) { |
| haveLayers = true; |
| if (layerColorIndex == 0xFFFF) { |
| paint.setColor(fRec.fForegroundColor); |
| } else { |
| paint.setColor(palette[layerColorIndex]); |
| } |
| SkPath path; |
| if (this->generateFacePath(face, layerGlyphIndex, loadGlyphFlags, &path)) { |
| canvas->drawPath(path, paint); |
| } |
| } |
| SkASSERTF(haveLayers, "Could not get COLRv0 layers from '%s'.", face->family_name); |
| return haveLayers; |
| } |
| #endif // FT_COLOR_H |
| |
| #if defined(FT_CONFIG_OPTION_SVG) |
| bool SkScalerContext_FreeType_Base::drawSVGGlyph(FT_Face face, |
| const SkGlyph& glyph, |
| uint32_t loadGlyphFlags, |
| SkSpan<SkColor> palette, |
| SkCanvas* canvas) { |
| SkASSERT(face->glyph->format == FT_GLYPH_FORMAT_SVG); |
| |
| FT_SVG_Document ftSvg = (FT_SVG_Document)face->glyph->other; |
| SkMatrix m; |
| FT_Matrix ftMatrix = ftSvg->transform; |
| FT_Vector ftOffset = ftSvg->delta; |
| m.setAll( |
| SkFixedToFloat(ftMatrix.xx), -SkFixedToFloat(ftMatrix.xy), SkFixedToFloat(ftOffset.x), |
| -SkFixedToFloat(ftMatrix.yx), SkFixedToFloat(ftMatrix.yy), -SkFixedToFloat(ftOffset.y), |
| 0 , 0 , 1 ); |
| m.postScale(SkFixedToFloat(ftSvg->metrics.x_scale) / 64.0f, |
| SkFixedToFloat(ftSvg->metrics.y_scale) / 64.0f); |
| if (this->isSubpixel()) { |
| m.postTranslate(SkFixedToScalar(glyph.getSubXFixed()), |
| SkFixedToScalar(glyph.getSubYFixed())); |
| } |
| canvas->concat(m); |
| |
| SkGraphics::OpenTypeSVGDecoderFactory svgFactory = SkGraphics::GetOpenTypeSVGDecoderFactory(); |
| if (!svgFactory) { |
| return false; |
| } |
| auto svgDecoder = svgFactory(ftSvg->svg_document, ftSvg->svg_document_length); |
| if (!svgDecoder) { |
| return false; |
| } |
| return svgDecoder->render(*canvas, ftSvg->units_per_EM, glyph.getGlyphID(), |
| fRec.fForegroundColor, palette); |
| } |
| #endif // FT_CONFIG_OPTION_SVG |
| |
| void SkScalerContext_FreeType_Base::generateGlyphImage(FT_Face face, |
| const SkGlyph& glyph, |
| const SkMatrix& bitmapTransform) |
| { |
| 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); |
| |
| if (SkMask::kLCD16_Format == glyph.fMaskFormat) { |
| const bool doBGR = SkToBool(fRec.fFlags & SkScalerContext::kLCD_BGROrder_Flag); |
| const bool doVert = SkToBool(fRec.fFlags & SkScalerContext::kLCD_Vertical_Flag); |
| |
| 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 %p.", face->glyph); |
| return; |
| } |
| |
| SkMask mask = glyph.mask(); |
| if constexpr (kSkShowTextBlitCoverage) { |
| memset(mask.fImage, 0x80, mask.fBounds.height() * mask.fRowBytes); |
| } |
| 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); |
| if constexpr (kSkShowTextBlitCoverage) { |
| if (glyph.fMaskFormat == SkMask::kBW_Format) { |
| for (unsigned y = 0; y < target.rows; y += 2) { |
| for (unsigned x = (y & 0x2); x < target.width; x+=4) { |
| uint8_t& b = target.buffer[(target.pitch * y) + (x >> 3)]; |
| b = b ^ (1 << (0x7 - (x & 0x7))); |
| } |
| } |
| } else { |
| for (unsigned y = 0; y < target.rows; ++y) { |
| for (unsigned x = 0; x < target.width; ++x) { |
| uint8_t& a = target.buffer[(target.pitch * y) + x]; |
| a = std::max<uint8_t>(a, 0x20); |
| } |
| } |
| } |
| } |
| } |
| } 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.setInfo(SkImageInfo::Make(face->glyph->bitmap.width, |
| face->glyph->bitmap.rows, |
| SkColorType_for_FTPixelMode(pixel_mode), |
| kPremul_SkAlphaType)); |
| if (!unscaledBitmap.tryAllocPixels()) { |
| // TODO: set the fImage to indicate "missing" |
| memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); |
| return; |
| } |
| |
| 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) { |
| if (!dstBitmap.tryAllocPixels()) { |
| // TODO: set the fImage to indicate "missing" |
| memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); |
| return; |
| } |
| } else { |
| dstBitmap.setPixels(glyph.fImage); |
| } |
| |
| // Scale unscaledBitmap into dstBitmap. |
| SkCanvas canvas(dstBitmap); |
| if constexpr (kSkShowTextBlitCoverage) { |
| canvas.clear(0x33FF0000); |
| } else { |
| canvas.clear(SK_ColorTRANSPARENT); |
| } |
| 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} {} |
| |
| inline 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}; |
| if (face->glyph->format != FT_GLYPH_FORMAT_OUTLINE || |
| FT_Outline_Decompose(&face->glyph->outline, &SkFTGeometrySink::Funcs, &sink)) |
| { |
| path->reset(); |
| return false; |
| } |
| path->close(); |
| return true; |
| } |
| |
| bool generateFacePathStatic(FT_Face face, SkGlyphID glyphID, uint32_t loadGlyphFlags, SkPath* path){ |
| loadGlyphFlags |= FT_LOAD_BITMAP_METRICS_ONLY; // Don't decode any bitmaps. |
| loadGlyphFlags |= FT_LOAD_NO_BITMAP; // Ignore embedded bitmaps. |
| loadGlyphFlags &= ~FT_LOAD_RENDER; // Don't scan convert. |
| loadGlyphFlags &= ~FT_LOAD_COLOR; // Ignore SVG. |
| if (FT_Load_Glyph(face, glyphID, loadGlyphFlags)) { |
| path->reset(); |
| return false; |
| } |
| return generateGlyphPathStatic(face, path); |
| } |
| |
| #ifdef TT_SUPPORT_COLRV1 |
| bool generateFacePathCOLRv1(FT_Face face, SkGlyphID glyphID, SkPath* path) { |
| uint32_t flags = 0; |
| flags |= FT_LOAD_BITMAP_METRICS_ONLY; // Don't decode any bitmaps. |
| flags |= FT_LOAD_NO_BITMAP; // Ignore embedded bitmaps. |
| flags &= ~FT_LOAD_RENDER; // Don't scan convert. |
| flags &= ~FT_LOAD_COLOR; // Ignore SVG. |
| flags |= FT_LOAD_NO_HINTING; |
| flags |= FT_LOAD_NO_AUTOHINT; |
| flags |= FT_LOAD_IGNORE_TRANSFORM; |
| |
| SkUniqueFTSize 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 tryGeneratePath = [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 pathGenerationResult = tryGeneratePath(); |
| |
| FT_Activate_Size(oldSize); |
| |
| return pathGenerationResult; |
| } |
| #endif |
| |
| } // namespace |
| |
| bool SkScalerContext_FreeType_Base::generateGlyphPath(FT_Face face, SkPath* path) { |
| if (!generateGlyphPathStatic(face, path)) { |
| return false; |
| } |
| if (face->glyph->outline.flags & FT_OUTLINE_OVERLAP) { |
| Simplify(*path, path); |
| // Simplify will return an even-odd path. |
| // A stroke+fill (for fake bold) may be incorrect for even-odd. |
| // https://github.com/flutter/flutter/issues/112546 |
| AsWinding(*path, path); |
| } |
| return true; |
| } |
| |
| bool SkScalerContext_FreeType_Base::generateFacePath(FT_Face face, |
| SkGlyphID glyphID, |
| uint32_t loadGlyphFlags, |
| SkPath* path) { |
| return generateFacePathStatic(face, glyphID, loadGlyphFlags, path); |
| } |
| |
| #ifdef TT_SUPPORT_COLRV1 |
| bool SkScalerContext_FreeType_Base::computeColrV1GlyphBoundingBox(FT_Face face, |
| SkGlyphID glyphID, |
| SkRect* bounds) { |
| SkMatrix ctm; |
| *bounds = SkRect::MakeEmpty(); |
| VisitedSet activePaints; |
| return colrv1_start_glyph_bounds(&ctm, bounds, face, glyphID, |
| FT_COLOR_INCLUDE_ROOT_TRANSFORM, &activePaints); |
| } |
| #endif |