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skia/skia.git/ed0a9a175b53ee9792f2acdcafe4000f7d919aff/./src/ports/SkScalerContext_win_dw.cpp
blob: d0d1b8f95dc9359846c72fdbb437b0b870ed5a72 [file]
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/utils/win/SkDWriteNTDDI_VERSION.h"
#include "include/core/SkTypes.h"
#if defined(SK_BUILD_FOR_WIN)
#undef GetGlyphIndices
#include "include/core/SkBBHFactory.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkData.h"
#include "include/core/SkDrawable.h"
#include "include/core/SkFontMetrics.h"
#include "include/core/SkGraphics.h"
#include "include/core/SkImage.h"
#include "include/core/SkOpenTypeSVGDecoder.h"
#include "include/core/SkPath.h"
#include "include/core/SkPictureRecorder.h"
#include "include/core/SkSpan.h"
#include "include/effects/SkGradient.h"
#include "include/private/SkMutex.h"
#include "include/private/SkTo.h"
#include "src/codec/SkCodecPriv.h"
#include "src/core/SkDraw.h"
#include "src/core/SkEndian.h"
#include "src/core/SkGlyph.h"
#include "src/core/SkMaskGamma.h"
#include "src/core/SkRasterClip.h"
#include "src/core/SkScalerContext.h"
#include "src/core/SkScopeExit.h"
#include "src/core/SkSharedMutex.h"
#include "src/ports/SkScalerContext_win_dw.h"
#include "src/ports/SkTypeface_win_dw.h"
#include "src/sfnt/SkOTTable_EBLC.h"
#include "src/sfnt/SkOTTable_EBSC.h"
#include "src/sfnt/SkOTTable_gasp.h"
#include "src/sfnt/SkOTTable_maxp.h"
#include "src/utils/SkMatrix22.h"
#include "src/utils/win/SkDWrite.h"
#include "src/utils/win/SkDWriteGeometrySink.h"
#include "src/utils/win/SkHRESULT.h"
#include "src/utils/win/SkTScopedComPtr.h"
#include <dwrite.h>
#include <dwrite_1.h>
#include <dwrite_3.h>
namespace {
static inline const constexpr bool kSkShowTextBlitCoverage = false;
/* Note:
* In versions 8 and 8.1 of Windows, some calls in DWrite are not thread safe.
* The mutex returned from maybe_dw_mutex protects the calls that are
* problematic.
*/
static SkSharedMutex* maybe_dw_mutex(DWriteFontTypeface& typeface) {
static SkSharedMutex mutex;
return typeface.fDWriteFontFace4 ? nullptr : &mutex;
}
class SK_SCOPED_CAPABILITY Exclusive {
public:
explicit Exclusive(SkSharedMutex* maybe_lock) SK_ACQUIRE(*maybe_lock)
: fLock(maybe_lock) {
if (fLock) {
fLock->acquire();
}
}
~Exclusive() SK_RELEASE_CAPABILITY() {
if (fLock) {
fLock->release();
}
}
private:
SkSharedMutex* fLock;
};
class SK_SCOPED_CAPABILITY Shared {
public:
explicit Shared(SkSharedMutex* maybe_lock) SK_ACQUIRE_SHARED(*maybe_lock)
: fLock(maybe_lock) {
if (fLock) {
fLock->acquireShared();
}
}
// You would think this should be SK_RELEASE_SHARED_CAPABILITY, but SK_SCOPED_CAPABILITY
// doesn't fully understand the difference between shared and exclusive.
// Please review https://reviews.llvm.org/D52578 for more information.
~Shared() SK_RELEASE_CAPABILITY() {
if (fLock) {
fLock->releaseShared();
}
}
private:
SkSharedMutex* fLock;
};
static bool isLCD(const SkScalerContextRec& rec) {
return SkMask::kLCD16_Format == rec.fMaskFormat;
}
static bool is_hinted(DWriteFontTypeface* typeface) {
Exclusive l(maybe_dw_mutex(*typeface));
AutoTDWriteTable<SkOTTableMaximumProfile> maxp(typeface->fDWriteFontFace.get());
if (!maxp.fExists) {
return false;
}
if (maxp.fSize < sizeof(SkOTTableMaximumProfile::Version::TT)) {
return false;
}
if (maxp->version.version != SkOTTableMaximumProfile::Version::TT::VERSION) {
return false;
}
return (0 != maxp->version.tt.maxSizeOfInstructions);
}
/** A GaspRange is inclusive, [min, max]. */
struct GaspRange {
using Behavior = SkOTTableGridAndScanProcedure::GaspRange::behavior;
GaspRange(int min, int max, int version, Behavior flags)
: fMin(min), fMax(max), fVersion(version), fFlags(flags) { }
int fMin;
int fMax;
int fVersion;
Behavior fFlags;
};
bool get_gasp_range(DWriteFontTypeface* typeface, int size, GaspRange* range) {
AutoTDWriteTable<SkOTTableGridAndScanProcedure> gasp(typeface->fDWriteFontFace.get());
if (!gasp.fExists) {
return false;
}
if (gasp.fSize < sizeof(SkOTTableGridAndScanProcedure)) {
return false;
}
if (gasp->version != SkOTTableGridAndScanProcedure::version0 &&
gasp->version != SkOTTableGridAndScanProcedure::version1)
{
return false;
}
uint16_t numRanges = SkEndianSwap16(gasp->numRanges);
if (numRanges > 1024 ||
gasp.fSize < sizeof(SkOTTableGridAndScanProcedure) +
sizeof(SkOTTableGridAndScanProcedure::GaspRange) * numRanges)
{
return false;
}
const SkOTTableGridAndScanProcedure::GaspRange* rangeTable =
SkTAfter<const SkOTTableGridAndScanProcedure::GaspRange>(gasp.get());
int minPPEM = -1;
for (uint16_t i = 0; i < numRanges; ++i, ++rangeTable) {
int maxPPEM = SkEndianSwap16(rangeTable->maxPPEM);
if (minPPEM < size && size <= maxPPEM) {
range->fMin = minPPEM + 1;
range->fMax = maxPPEM;
range->fVersion = SkEndian_SwapBE16(gasp->version);
range->fFlags = rangeTable->flags;
return true;
}
minPPEM = maxPPEM;
}
return false;
}
/** If the rendering mode for the specified 'size' is gridfit, then place
* the gridfit range into 'range'. Otherwise, leave 'range' alone.
*/
static bool is_gridfit_only(GaspRange::Behavior flags) {
return flags.raw.value == GaspRange::Behavior::Raw::GridfitMask;
}
static bool has_bitmap_strike(DWriteFontTypeface* typeface, GaspRange range) {
Exclusive l(maybe_dw_mutex(*typeface));
{
AutoTDWriteTable<SkOTTableEmbeddedBitmapLocation> eblc(typeface->fDWriteFontFace.get());
if (!eblc.fExists) {
return false;
}
if (eblc.fSize < sizeof(SkOTTableEmbeddedBitmapLocation)) {
return false;
}
if (eblc->version != SkOTTableEmbeddedBitmapLocation::version_initial) {
return false;
}
uint32_t numSizes = SkEndianSwap32(eblc->numSizes);
if (numSizes > 1024 ||
eblc.fSize < sizeof(SkOTTableEmbeddedBitmapLocation) +
sizeof(SkOTTableEmbeddedBitmapLocation::BitmapSizeTable) * numSizes)
{
return false;
}
const SkOTTableEmbeddedBitmapLocation::BitmapSizeTable* sizeTable =
SkTAfter<const SkOTTableEmbeddedBitmapLocation::BitmapSizeTable>(eblc.get());
for (uint32_t i = 0; i < numSizes; ++i, ++sizeTable) {
if (sizeTable->ppemX == sizeTable->ppemY &&
range.fMin <= sizeTable->ppemX && sizeTable->ppemX <= range.fMax)
{
// TODO: determine if we should dig through IndexSubTableArray/IndexSubTable
// to determine the actual number of glyphs with bitmaps.
// TODO: Ensure that the bitmaps actually cover a significant portion of the strike.
// TODO: Ensure that the bitmaps are bi-level?
if (sizeTable->endGlyphIndex >= sizeTable->startGlyphIndex + 3) {
return true;
}
}
}
}
{
AutoTDWriteTable<SkOTTableEmbeddedBitmapScaling> ebsc(typeface->fDWriteFontFace.get());
if (!ebsc.fExists) {
return false;
}
if (ebsc.fSize < sizeof(SkOTTableEmbeddedBitmapScaling)) {
return false;
}
if (ebsc->version != SkOTTableEmbeddedBitmapScaling::version_initial) {
return false;
}
uint32_t numSizes = SkEndianSwap32(ebsc->numSizes);
if (numSizes > 1024 ||
ebsc.fSize < sizeof(SkOTTableEmbeddedBitmapScaling) +
sizeof(SkOTTableEmbeddedBitmapScaling::BitmapScaleTable) * numSizes)
{
return false;
}
const SkOTTableEmbeddedBitmapScaling::BitmapScaleTable* scaleTable =
SkTAfter<const SkOTTableEmbeddedBitmapScaling::BitmapScaleTable>(ebsc.get());
for (uint32_t i = 0; i < numSizes; ++i, ++scaleTable) {
if (scaleTable->ppemX == scaleTable->ppemY &&
range.fMin <= scaleTable->ppemX && scaleTable->ppemX <= range.fMax) {
// EBSC tables are normally only found in bitmap only fonts.
return true;
}
}
}
return false;
}
static bool both_zero(SkScalar a, SkScalar b) {
return 0 == a && 0 == b;
}
// returns false if there is any non-90-rotation or skew
static bool is_axis_aligned(const SkScalerContextRec& rec) {
return 0 == rec.fPreSkewX &&
(both_zero(rec.fPost2x2[0][1], rec.fPost2x2[1][0]) ||
both_zero(rec.fPost2x2[0][0], rec.fPost2x2[1][1]));
}
} //namespace
SkScalerContext_DW::SkScalerContext_DW(DWriteFontTypeface& typefaceRef,
const SkScalerContextEffects& effects,
const SkDescriptor* desc)
: SkScalerContext(typefaceRef, effects, desc)
{
DWriteFontTypeface* typeface = this->getDWriteTypeface();
fGlyphCount = typeface->fDWriteFontFace->GetGlyphCount();
// In general, all glyphs should use NATURAL_SYMMETRIC
// except when bi-level rendering is requested or there are embedded
// bi-level bitmaps (and the embedded bitmap flag is set and no rotation).
//
// DirectWrite's IDWriteFontFace::GetRecommendedRenderingMode does not do
// this. As a result, determine the actual size of the text and then see if
// there are any embedded bi-level bitmaps of that size. If there are, then
// force bitmaps by requesting bi-level rendering.
//
// FreeType allows for separate ppemX and ppemY, but DirectWrite assumes
// square pixels and only uses ppemY. Therefore the transform must track any
// non-uniform x-scale.
//
// Also, rotated glyphs should have the same absolute advance widths as
// horizontal glyphs and the subpixel flag should not affect glyph shapes.
SkVector scale;
fRec.computeMatrices(SkScalerContextRec::PreMatrixScale::kVertical, &scale, &fSkXform);
fXform.m11 = SkScalarToFloat(fSkXform.getScaleX());
fXform.m12 = SkScalarToFloat(fSkXform.getSkewY());
fXform.m21 = SkScalarToFloat(fSkXform.getSkewX());
fXform.m22 = SkScalarToFloat(fSkXform.getScaleY());
fXform.dx = 0;
fXform.dy = 0;
// realTextSize is the actual device size we want (as opposed to the size the user requested).
// gdiTextSize is the size we request when GDI compatible.
// If the scale is negative, this means the matrix will do the flip anyway.
const SkScalar realTextSize = scale.fY;
// Due to floating point math, the lower bits are suspect. Round carefully.
SkScalar gdiTextSize = SkScalarRoundToScalar(realTextSize * 64.0f) / 64.0f;
if (gdiTextSize == 0) {
gdiTextSize = SK_Scalar1;
}
bool bitmapRequested = SkToBool(fRec.fFlags & SkScalerContext::kEmbeddedBitmapText_Flag);
bool treatLikeBitmap = false;
bool axisAlignedBitmap = false;
if (bitmapRequested) {
// When embedded bitmaps are requested, treat the entire range like
// a bitmap strike if the range is gridfit only and contains a bitmap.
int bitmapPPEM = SkScalarTruncToInt(gdiTextSize);
GaspRange range(bitmapPPEM, bitmapPPEM, 0, GaspRange::Behavior());
if (get_gasp_range(typeface, bitmapPPEM, &range)) {
if (!is_gridfit_only(range.fFlags)) {
range = GaspRange(bitmapPPEM, bitmapPPEM, 0, GaspRange::Behavior());
}
}
treatLikeBitmap = has_bitmap_strike(typeface, range);
axisAlignedBitmap = is_axis_aligned(fRec);
}
GaspRange range(0, 0xFFFF, 0, GaspRange::Behavior());
// If the user requested aliased, do so with aliased compatible metrics.
if (SkMask::kBW_Format == fRec.fMaskFormat) {
fTextSizeRender = gdiTextSize;
fRenderingMode = DWRITE_RENDERING_MODE_ALIASED;
fTextureType = DWRITE_TEXTURE_ALIASED_1x1;
fTextSizeMeasure = gdiTextSize;
fMeasuringMode = DWRITE_MEASURING_MODE_GDI_CLASSIC;
// If we can use a bitmap, use gdi classic rendering and measurement.
// This will not always provide a bitmap, but matches expected behavior.
} else if (treatLikeBitmap && axisAlignedBitmap) {
fTextSizeRender = gdiTextSize;
fRenderingMode = DWRITE_RENDERING_MODE_GDI_CLASSIC;
fTextureType = DWRITE_TEXTURE_CLEARTYPE_3x1;
fTextSizeMeasure = gdiTextSize;
fMeasuringMode = DWRITE_MEASURING_MODE_GDI_CLASSIC;
// If rotated but the horizontal text could have used a bitmap,
// render high quality rotated glyphs but measure using bitmap metrics.
} else if (treatLikeBitmap) {
fTextSizeRender = gdiTextSize;
fRenderingMode = DWRITE_RENDERING_MODE_NATURAL_SYMMETRIC;
fTextureType = DWRITE_TEXTURE_CLEARTYPE_3x1;
fTextSizeMeasure = gdiTextSize;
fMeasuringMode = DWRITE_MEASURING_MODE_GDI_CLASSIC;
// If the font has a gasp table version 1, use it to determine symmetric rendering.
} else if (get_gasp_range(typeface, SkScalarRoundToInt(gdiTextSize), &range) &&
range.fVersion >= 1)
{
fTextSizeRender = realTextSize;
fRenderingMode = range.fFlags.field.SymmetricSmoothing
? DWRITE_RENDERING_MODE_NATURAL_SYMMETRIC
: DWRITE_RENDERING_MODE_NATURAL;
fTextureType = DWRITE_TEXTURE_CLEARTYPE_3x1;
fTextSizeMeasure = realTextSize;
fMeasuringMode = DWRITE_MEASURING_MODE_NATURAL;
// If the requested size is above 20px or there are no bytecode hints, use symmetric rendering.
} else if (realTextSize > SkIntToScalar(20) || !is_hinted(typeface)) {
fTextSizeRender = realTextSize;
fRenderingMode = DWRITE_RENDERING_MODE_NATURAL_SYMMETRIC;
fTextureType = DWRITE_TEXTURE_CLEARTYPE_3x1;
fTextSizeMeasure = realTextSize;
fMeasuringMode = DWRITE_MEASURING_MODE_NATURAL;
// Fonts with hints, no gasp or gasp version 0, and below 20px get non-symmetric rendering.
// Often such fonts have hints which were only tested with GDI ClearType classic.
// Some of these fonts rely on drop out control in the y direction in order to be legible.
// Tenor Sans
// https://fonts.google.com/specimen/Tenor+Sans
// Gill Sans W04
// https://cdn.leagueoflegends.com/lolkit/1.1.9/resources/fonts/gill-sans-w04-book.woff
// https://na.leagueoflegends.com/en/news/game-updates/patch/patch-410-notes
// See https://crbug.com/385897
} else {
fTextSizeRender = gdiTextSize;
fRenderingMode = DWRITE_RENDERING_MODE_NATURAL;
fTextureType = DWRITE_TEXTURE_CLEARTYPE_3x1;
fTextSizeMeasure = realTextSize;
fMeasuringMode = DWRITE_MEASURING_MODE_NATURAL;
}
// DirectWrite2 allows for grayscale hinting.
fAntiAliasMode = DWRITE_TEXT_ANTIALIAS_MODE_CLEARTYPE;
if (typeface->fFactory2 && typeface->fDWriteFontFace2 &&
SkMask::kA8_Format == fRec.fMaskFormat &&
!(fRec.fFlags & SkScalerContext::kGenA8FromLCD_Flag))
{
// DWRITE_TEXTURE_ALIASED_1x1 is now misnamed, it must also be used with grayscale.
fTextureType = DWRITE_TEXTURE_ALIASED_1x1;
fAntiAliasMode = DWRITE_TEXT_ANTIALIAS_MODE_GRAYSCALE;
}
// DirectWrite2 allows hinting to be disabled.
fGridFitMode = DWRITE_GRID_FIT_MODE_ENABLED;
if (fRec.getHinting() == SkFontHinting::kNone) {
fGridFitMode = DWRITE_GRID_FIT_MODE_DISABLED;
if (fRenderingMode != DWRITE_RENDERING_MODE_ALIASED) {
fRenderingMode = DWRITE_RENDERING_MODE_NATURAL_SYMMETRIC;
}
}
if (this->isLinearMetrics()) {
fTextSizeMeasure = realTextSize;
fMeasuringMode = DWRITE_MEASURING_MODE_NATURAL;
}
// The GDI measuring modes don't seem to work well with CBDT fonts (DWrite.dll 10.0.18362.836).
if (fMeasuringMode != DWRITE_MEASURING_MODE_NATURAL) {
constexpr UINT32 CBDTTag = DWRITE_MAKE_OPENTYPE_TAG('C','B','D','T');
AutoDWriteTable CBDT(typeface->fDWriteFontFace.get(), CBDTTag);
if (CBDT.fExists) {
fMeasuringMode = DWRITE_MEASURING_MODE_NATURAL;
}
}
}
SkScalerContext_DW::~SkScalerContext_DW() {
}
#if DWRITE_CORE || (defined(NTDDI_WIN11_ZN) && NTDDI_VERSION >= NTDDI_WIN11_ZN)
namespace {
SkColor4f sk_color_from(DWRITE_COLOR_F const& color) {
// DWRITE_COLOR_F and SkColor4f are laid out the same and this should be a no-op.
return SkColor4f{ color.r, color.g, color.b, color.a };
}
DWRITE_COLOR_F dw_color_from(SkColor4f const& color) {
// DWRITE_COLOR_F and SkColor4f are laid out the same and this should be a no-op.
// Avoid brace initialization as DWRITE_COLOR_F can be defined as four floats (dxgitype.h,
// d3d9types.h) or four unions of two floats (dwrite_2.h, d3dtypes.h). The type changed in
// Direct3D 10, but the change does not appear to be documented.
DWRITE_COLOR_F dwColor;
dwColor.r = color.fR;
dwColor.g = color.fG;
dwColor.b = color.fB;
dwColor.a = color.fA;
return dwColor;
}
SkRect sk_rect_from(D2D_RECT_F const& rect) {
// D2D_RECT_F and SkRect are both y-down and laid the same so this should be a no-op.
return SkRect{ rect.left, rect.top, rect.right, rect.bottom };
}
constexpr bool D2D_RECT_F_is_empty(const D2D_RECT_F& r) {
return r.right <= r.left || r.bottom <= r.top;
}
SkMatrix sk_matrix_from(DWRITE_MATRIX const& m) {
// DWRITE_MATRIX and SkMatrix are y-down. However DWRITE_MATRIX is affine only.
return SkMatrix::MakeAll(
m.m11, m.m21, m.dx,
m.m12, m.m22, m.dy,
0, 0, 1);
}
SkTileMode sk_tile_mode_from(D2D1_EXTEND_MODE extendMode) {
switch (extendMode) {
case D2D1_EXTEND_MODE_CLAMP:
return SkTileMode::kClamp;
case D2D1_EXTEND_MODE_WRAP:
return SkTileMode::kRepeat;
case D2D1_EXTEND_MODE_MIRROR:
return SkTileMode::kMirror;
default:
return SkTileMode::kClamp;
}
}
SkBlendMode sk_blend_mode_from(DWRITE_COLOR_COMPOSITE_MODE compositeMode) {
switch (compositeMode) {
case DWRITE_COLOR_COMPOSITE_CLEAR:
return SkBlendMode::kClear;
case DWRITE_COLOR_COMPOSITE_SRC:
return SkBlendMode::kSrc;
case DWRITE_COLOR_COMPOSITE_DEST:
return SkBlendMode::kDst;
case DWRITE_COLOR_COMPOSITE_SRC_OVER:
return SkBlendMode::kSrcOver;
case DWRITE_COLOR_COMPOSITE_DEST_OVER:
return SkBlendMode::kDstOver;
case DWRITE_COLOR_COMPOSITE_SRC_IN:
return SkBlendMode::kSrcIn;
case DWRITE_COLOR_COMPOSITE_DEST_IN:
return SkBlendMode::kDstIn;
case DWRITE_COLOR_COMPOSITE_SRC_OUT:
return SkBlendMode::kSrcOut;
case DWRITE_COLOR_COMPOSITE_DEST_OUT:
return SkBlendMode::kDstOut;
case DWRITE_COLOR_COMPOSITE_SRC_ATOP:
return SkBlendMode::kSrcATop;
case DWRITE_COLOR_COMPOSITE_DEST_ATOP:
return SkBlendMode::kDstATop;
case DWRITE_COLOR_COMPOSITE_XOR:
return SkBlendMode::kXor;
case DWRITE_COLOR_COMPOSITE_PLUS:
return SkBlendMode::kPlus;
case DWRITE_COLOR_COMPOSITE_SCREEN:
return SkBlendMode::kScreen;
case DWRITE_COLOR_COMPOSITE_OVERLAY:
return SkBlendMode::kOverlay;
case DWRITE_COLOR_COMPOSITE_DARKEN:
return SkBlendMode::kDarken;
case DWRITE_COLOR_COMPOSITE_LIGHTEN:
return SkBlendMode::kLighten;
case DWRITE_COLOR_COMPOSITE_COLOR_DODGE:
return SkBlendMode::kColorDodge;
case DWRITE_COLOR_COMPOSITE_COLOR_BURN:
return SkBlendMode::kColorBurn;
case DWRITE_COLOR_COMPOSITE_HARD_LIGHT:
return SkBlendMode::kHardLight;
case DWRITE_COLOR_COMPOSITE_SOFT_LIGHT:
return SkBlendMode::kSoftLight;
case DWRITE_COLOR_COMPOSITE_DIFFERENCE:
return SkBlendMode::kDifference;
case DWRITE_COLOR_COMPOSITE_EXCLUSION:
return SkBlendMode::kExclusion;
case DWRITE_COLOR_COMPOSITE_MULTIPLY:
return SkBlendMode::kMultiply;
case DWRITE_COLOR_COMPOSITE_HSL_HUE:
return SkBlendMode::kHue;
case DWRITE_COLOR_COMPOSITE_HSL_SATURATION:
return SkBlendMode::kSaturation;
case DWRITE_COLOR_COMPOSITE_HSL_COLOR:
return SkBlendMode::kColor;
case DWRITE_COLOR_COMPOSITE_HSL_LUMINOSITY:
return SkBlendMode::kLuminosity;
default:
return SkBlendMode::kDst;
}
}
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;
}
// 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.
D2D1_COLOR_F lerpSkColor(D2D1_COLOR_F c0, D2D1_COLOR_F 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 = skvx::float4(c0.r, c0.g, c0.b, c0.a),
c1_4f = skvx::float4(c1.r, c1.g, c1.b, c1.a),
c_4f = c0_4f + (c1_4f - c0_4f) * t;
D2D1_COLOR_F r;
c_4f.store(&r);
return r;
}
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<D2D1_GRADIENT_STOP>& stops,
TruncateStops truncateStops) {
if (stops.size() <= 1u ||
zeroRadiusStop < stops.front().position || stops.back().position < zeroRadiusStop) {
return;
}
auto lcmp = [](D2D1_GRADIENT_STOP const& stop, SkScalar position) {
return stop.position < position;
};
auto ucmp = [](SkScalar position, D2D1_GRADIENT_STOP const& stop) {
return position < stop.position;
};
size_t afterIndex = (truncateStops == TruncateStart)
? std::lower_bound(stops.begin(), stops.end(), zeroRadiusStop, lcmp) - stops.begin()
: std::upper_bound(stops.begin(), stops.end(), zeroRadiusStop, ucmp) - stops.begin();
const float t = (zeroRadiusStop - stops[afterIndex - 1].position) /
(stops[afterIndex].position - stops[afterIndex - 1].position);
D2D1_COLOR_F lerpColor = lerpSkColor(stops[afterIndex - 1].color, stops[afterIndex].color, t);
if (truncateStops == TruncateStart) {
stops.erase(stops.begin(), stops.begin() + afterIndex);
stops.insert(stops.begin(), { 0, lerpColor });
} else {
stops.erase(stops.begin() + afterIndex, stops.end());
stops.insert(stops.end(), { 1, lerpColor });
}
}
} // namespace
bool SkScalerContext_DW::drawColorV1Paint(SkCanvas& canvas,
IDWritePaintReader& reader,
DWRITE_PAINT_ELEMENT const & element)
{
// Helper to draw the specified number of children.
auto drawChildren = [&](uint32_t childCount) -> bool {
if (childCount != 0) {
DWRITE_PAINT_ELEMENT childElement;
HRB(reader.MoveToFirstChild(&childElement));
this->drawColorV1Paint(canvas, reader, childElement);
for (uint32_t i = 1; i < childCount; i++) {
HRB(reader.MoveToNextSibling(&childElement));
this->drawColorV1Paint(canvas, reader, childElement);
}
HRB(reader.MoveToParent());
}
return true;
};
SkAutoCanvasRestore restoreCanvas(&canvas, true);
switch (element.paintType) {
case DWRITE_PAINT_TYPE_NONE:
return true;
case DWRITE_PAINT_TYPE_LAYERS: {
// A layers paint element has a variable number of children.
return drawChildren(element.paint.layers.childCount);
}
case DWRITE_PAINT_TYPE_SOLID_GLYPH: {
// A solid glyph paint element has no children.
// glyphIndex, color.value, color.paletteEntryIndex, color.alpha, color.colorAttributes
auto const& solidGlyph = element.paint.solidGlyph;
SkPathBuilder builder;
SkTScopedComPtr<IDWriteGeometrySink> geometryToPath;
HRBM(SkDWriteGeometrySink::Create(&builder, &geometryToPath),
"Could not create geometry to path converter.");
UINT16 glyphId = SkTo<UINT16>(solidGlyph.glyphIndex);
{
Exclusive l(maybe_dw_mutex(*this->getDWriteTypeface()));
HRBM(this->getDWriteTypeface()->fDWriteFontFace->GetGlyphRunOutline(
SkScalarToFloat(fTextSizeRender),
&glyphId,
nullptr, //advances
nullptr, //offsets
1, //num glyphs
FALSE, //sideways
FALSE, //rtl
geometryToPath.get()),
"Could not create glyph outline.");
}
builder.transform(SkMatrix::Scale(1.0f / fTextSizeRender, 1.0f / fTextSizeRender));
SkPaint skPaint;
skPaint.setColor4f(sk_color_from(solidGlyph.color.value));
skPaint.setAntiAlias(fRenderingMode != DWRITE_RENDERING_MODE_ALIASED);
canvas.drawPath(builder.detach(), skPaint);
return true;
}
case DWRITE_PAINT_TYPE_SOLID: {
// A solid paint element has no children.
// value, paletteEntryIndex, alphaMultiplier, colorAttributes
SkPaint skPaint;
skPaint.setColor4f(sk_color_from(element.paint.solid.value));
canvas.drawPaint(skPaint);
return true;
}
case DWRITE_PAINT_TYPE_LINEAR_GRADIENT: {
auto const& linearGradient = element.paint.linearGradient;
// A linear gradient paint element has no children.
// x0, y0, x1, y1, x2, y2, extendMode, gradientStopCount, [colorStops]
if (linearGradient.gradientStopCount == 0) {
return true;
}
std::vector<D2D1_GRADIENT_STOP> stops;
stops.resize(linearGradient.gradientStopCount);
// If success stops will be ordered.
HRBM(reader.GetGradientStops(0, stops.size(), stops.data()),
"Could not get linear gradient stops.");
SkPaint skPaint;
if (stops.size() == 1) {
skPaint.setColor4f(sk_color_from(stops[0].color));
canvas.drawPaint(skPaint);
return true;
}
SkPoint linePositions[2] = { {linearGradient.x0, linearGradient.y0},
{linearGradient.x1, linearGradient.y1} };
SkPoint p0 = linePositions[0];
SkPoint p1 = linePositions[1];
SkPoint p2 = SkPoint::Make(linearGradient.x2, linearGradient.y2);
// 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)) {
skPaint.setColor4f(sk_color_from(stops[0].color));
canvas.drawPaint(skPaint);
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 = sk_tile_mode_from(SkTo<D2D1_EXTEND_MODE>(linearGradient.extendMode));
SkScalar colorStopRange = stops.back().position - stops.front().position;
// 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) {
//skPaint.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().position + 1.0f, stops.back().color });
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().position != 0.f)) {
SkVector p0p3 = p3 - p0;
SkVector p0Offset = p0p3;
p0Offset.scale(stops.front().position);
SkVector p1Offset = p0p3;
p1Offset.scale(stops.back().position);
linePositions[0] = p0 + p0Offset;
linePositions[1] = p0 + p1Offset;
SkScalar scaleFactor = 1 / colorStopRange;
SkScalar startOffset = stops.front().position;
for (D2D1_GRADIENT_STOP& stop : stops) {
stop.position = (stop.position - startOffset) * scaleFactor;
}
}
std::unique_ptr<SkColor4f[]> skColors(new SkColor4f[stops.size()]);
std::unique_ptr<SkScalar[]> skStops(new SkScalar[stops.size()]);
for (size_t i = 0; i < stops.size(); ++i) {
skColors[i] = sk_color_from(stops[i].color);
skStops[i] = stops[i].position;
}
sk_sp<SkShader> shader(SkShaders::LinearGradient(
linePositions,
SkGradient(
SkGradient::Colors(
SkSpan(skColors.get(), stops.size()),
SkSpan(skStops.get(), stops.size()),
tileMode),
SkGradient::Interpolation{
SkGradient::Interpolation::InPremul::kNo,
SkGradient::Interpolation::ColorSpace::kSRGB,
SkGradient::Interpolation::HueMethod::kShorter
}
)
));
SkASSERT(shader);
// An opaque color is needed to ensure the gradient is not modulated by alpha.
skPaint.setColor(SK_ColorBLACK);
skPaint.setShader(shader);
canvas.drawPaint(skPaint);
return true;
}
case DWRITE_PAINT_TYPE_RADIAL_GRADIENT: {
auto const& radialGradient = element.paint.radialGradient;
// A radial gradient paint element has no children.
// x0, y0, radius0, x1, y1, radius1, extendMode, gradientStopCount, [colorsStops]
SkPoint start = SkPoint::Make(radialGradient.x0, radialGradient.y0);
SkScalar startRadius = radialGradient.radius0;
SkPoint end = SkPoint::Make(radialGradient.x1, radialGradient.y1);
SkScalar endRadius = radialGradient.radius1;
if (radialGradient.gradientStopCount == 0) {
return true;
}
std::vector<D2D1_GRADIENT_STOP> stops;
stops.resize(radialGradient.gradientStopCount);
// If success stops will be ordered.
HRBM(reader.GetGradientStops(0, stops.size(), stops.data()),
"Could not get radial gradient stops.");
SkPaint skPaint;
if (stops.size() == 1) {
skPaint.setColor4f(sk_color_from(stops[0].color));
canvas.drawPaint(skPaint);
return true;
}
SkScalar colorStopRange = stops.back().position - stops.front().position;
SkTileMode tileMode = sk_tile_mode_from(SkTo<D2D1_EXTEND_MODE>(radialGradient.extendMode));
if (colorStopRange == 0.f) {
if (tileMode != SkTileMode::kClamp) {
//skPaint.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().position + 1.0f, stops.back().color });
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().position != 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().position;
SkVector startOffset = startToEnd;
startOffset.scale(stops.front().position);
SkVector endOffset = startToEnd;
endOffset.scale(stops.back().position);
// 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().position;
startRadius = startRadius + radiusDiff * stops.front().position;
for (auto& stop : stops) {
stop.position = (stop.position - 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) {
//skPaint.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, 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;
stops.erase(stops.begin(), stops.end() - 1);
} else {
start -= startToEnd;
startRadius = -radiusDiff;
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;
}
}
}
std::unique_ptr<SkColor4f[]> skColors(new SkColor4f[stops.size()]);
std::unique_ptr<SkScalar[]> skStops(new SkScalar[stops.size()]);
for (size_t i = 0; i < stops.size(); ++i) {
skColors[i] = sk_color_from(stops[i].color);
skStops[i] = stops[i].position;
}
// An opaque color is needed to ensure the gradient is not modulated by alpha.
skPaint.setColor(SK_ColorBLACK);
skPaint.setShader(SkShaders::TwoPointConicalGradient(
start, startRadius, end, endRadius,
SkGradient(
SkGradient::Colors(
SkSpan(skColors.get(), stops.size()),
SkSpan(skStops.get(), stops.size()),
tileMode),
SkGradient::Interpolation{
SkGradient::Interpolation::InPremul::kNo,
SkGradient::Interpolation::ColorSpace::kSRGB,
SkGradient::Interpolation::HueMethod::kShorter
}
)
));
canvas.drawPaint(skPaint);
return true;
}
case DWRITE_PAINT_TYPE_SWEEP_GRADIENT: {
auto const& sweepGradient = element.paint.sweepGradient;
// A sweep gradient paint element has no children.
// centerX, centerY, startAngle, endAngle, extendMode, gradientStopCount, [colorStops]
if (sweepGradient.gradientStopCount == 0) {
return true;
}
std::vector<D2D1_GRADIENT_STOP> stops;
stops.resize(sweepGradient.gradientStopCount);
// If success stops will be ordered.
HRBM(reader.GetGradientStops(0, stops.size(), stops.data()),
"Could not get sweep gradient stops");
SkPaint skPaint;
if (stops.size() == 1) {
skPaint.setColor4f(sk_color_from(stops[0].color));
canvas.drawPaint(skPaint);
return true;
}
SkPoint center = SkPoint::Make(sweepGradient.centerX, sweepGradient.centerY);
SkScalar startAngle = sweepGradient.startAngle;
SkScalar endAngle = sweepGradient.endAngle;
// OpenType 1.9.1 adds a shift to the angle to ease specification of a 0 to 360
// degree sweep. This appears to already be applied by DW.
//startAngle += 180.0f;
//endAngle += 180.0f;
// An opaque color is needed to ensure the gradient is not modulated by alpha.
skPaint.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 = sk_tile_mode_from(SkTo<D2D1_EXTEND_MODE>(sweepGradient.extendMode));
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.".
//skPaint.setColor(SK_ColorTRANSPARENT);
return true;
}
SkScalar startAngleScaled = startAngle + sectorAngle * stops.front().position;
SkScalar endAngleScaled = startAngle + sectorAngle * stops.back().position;
// 2) Scale stops accordingly to 0 to 1 range.
float colorStopRange = stops.back().position - stops.front().position;
if (colorStopRange == 0.f) {
if (tileMode != SkTileMode::kClamp) {
//skPaint.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().position + 1.0f, stops.back().color });
colorStopRange = 1.0f;
}
}
SkScalar scaleFactor = 1 / colorStopRange;
SkScalar startOffset = stops.front().position;
for (D2D1_GRADIENT_STOP& stop : stops) {
stop.position = (stop.position - 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) {
std::swap(startAngleScaled, endAngleScaled);
std::reverse(stops.begin(), stops.end());
for (auto& stop : stops) {
stop.position = 1.0f - stop.position;
}
}
std::unique_ptr<SkColor4f[]> skColors(new SkColor4f[stops.size()]);
std::unique_ptr<SkScalar[]> skStops(new SkScalar[stops.size()]);
for (size_t i = 0; i < stops.size(); ++i) {
skColors[i] = sk_color_from(stops[i].color);
skStops[i] = stops[i].position;
}
skPaint.setShader(SkShaders::SweepGradient(
center, startAngleScaled, endAngleScaled,
SkGradient(
SkGradient::Colors(
SkSpan(skColors.get(), stops.size()),
SkSpan(skStops.get(), stops.size()),
tileMode),
SkGradient::Interpolation{
SkGradient::Interpolation::InPremul::kNo,
SkGradient::Interpolation::ColorSpace::kSRGB,
SkGradient::Interpolation::HueMethod::kShorter
}
)
));
canvas.drawPaint(skPaint);
return true;
}
case DWRITE_PAINT_TYPE_GLYPH: {
// A glyph paint element has one child, which is the fill for the glyph shape glyphIndex.
SkPathBuilder builder;
SkTScopedComPtr<IDWriteGeometrySink> geometryToPath;
HRBM(SkDWriteGeometrySink::Create(&builder, &geometryToPath),
"Could not create geometry to path converter.");
UINT16 glyphId = SkTo<UINT16>(element.paint.glyph.glyphIndex);
{
Exclusive l(maybe_dw_mutex(*this->getDWriteTypeface()));
HRBM(this->getDWriteTypeface()->fDWriteFontFace->GetGlyphRunOutline(
SkScalarToFloat(fTextSizeRender),
&glyphId,
nullptr, //advances
nullptr, //offsets
1, //num glyphs
FALSE, //sideways
FALSE, //rtl
geometryToPath.get()),
"Could not create glyph outline.");
}
builder.transform(SkMatrix::Scale(1.0f / fTextSizeRender, 1.0f / fTextSizeRender));
canvas.clipPath(builder.detach(), fRenderingMode != DWRITE_RENDERING_MODE_ALIASED);
drawChildren(1);
return true;
}
case DWRITE_PAINT_TYPE_COLOR_GLYPH: {
auto const& colorGlyph = element.paint.colorGlyph;
// A color glyph paint element has one child, the root of the paint tree for glyphIndex.
// glyphIndex, clipBox
if (D2D_RECT_F_is_empty(colorGlyph.clipBox)) {
// Does not have a clip box
} else {
SkRect r = sk_rect_from(colorGlyph.clipBox);
canvas.clipRect(r, fRenderingMode != DWRITE_RENDERING_MODE_ALIASED);
}
drawChildren(1);
return true;
}
case DWRITE_PAINT_TYPE_TRANSFORM: {
// A transform paint element always has one child, the transformed content.
canvas.concat(sk_matrix_from(element.paint.transform));
drawChildren(1);
return true;
}
case DWRITE_PAINT_TYPE_COMPOSITE: {
// A composite paint element has two children, the source and destination of the operation.
SkPaint blendModePaint;
blendModePaint.setBlendMode(sk_blend_mode_from(element.paint.composite.mode));
SkAutoCanvasRestore acr(&canvas, false);
// Need to visit the second child first and do savelayers, so manually handle children.
DWRITE_PAINT_ELEMENT sourceElement;
DWRITE_PAINT_ELEMENT backdropElement;
HRBM(reader.MoveToFirstChild(&sourceElement), "Could not move to child.");
HRBM(reader.MoveToNextSibling(&backdropElement), "Could not move to sibiling.");
canvas.saveLayer(nullptr, nullptr);
this->drawColorV1Paint(canvas, reader, backdropElement);
HRBM(reader.MoveToParent(), "Could not move to parent.");
HRBM(reader.MoveToFirstChild(&sourceElement), "Could not move to child.");
canvas.saveLayer(nullptr, &blendModePaint);
this->drawColorV1Paint(canvas, reader, sourceElement);
HRBM(reader.MoveToParent(), "Could not move to parent.");
return true;
}
default:
return false;
}
}
bool SkScalerContext_DW::drawColorV1Image(const SkGlyph& glyph, SkCanvas& canvas) {
DWriteFontTypeface* typeface = this->getDWriteTypeface();
IDWriteFontFace7* fontFace = typeface->fDWriteFontFace7/*.get()*/;
if (!fontFace) {
return false;
}
UINT32 glyphIndex = glyph.getGlyphID();
SkTScopedComPtr<IDWritePaintReader> paintReader;
HRBM(fontFace->CreatePaintReader(DWRITE_GLYPH_IMAGE_FORMATS_COLR_PAINT_TREE,
DWRITE_PAINT_FEATURE_LEVEL_COLR_V1,
&paintReader),
"Could not create paint reader.");
DWRITE_PAINT_ELEMENT paintElement;
D2D_RECT_F clipBox;
DWRITE_PAINT_ATTRIBUTES attributes;
HRBM(paintReader->SetCurrentGlyph(glyphIndex, &paintElement, &clipBox, &attributes),
"Could not set current glyph.");
if (paintElement.paintType == DWRITE_PAINT_TYPE_NONE) {
// Does not have paint layers, try another format.
return false;
}
// All coordinates (including top level clip) are reported in "em"s (1 == em).
// Size up all em units to the current size and transform.
// Get glyph paths at render size, divide out the render size to get em units.
SkMatrix matrix = fSkXform;
SkScalar scale = fTextSizeRender;
matrix.preScale(scale, scale);
if (this->isSubpixel()) {
matrix.postTranslate(SkFixedToScalar(glyph.getSubXFixed()),
SkFixedToScalar(glyph.getSubYFixed()));
}
canvas.concat(matrix);
if (D2D_RECT_F_is_empty(clipBox)) {
// Does not have a clip box
} else {
canvas.clipRect(sk_rect_from(clipBox));
}
// The DirectWrite interface returns resolved colors if these are provided.
// Indexes and alphas are reported but there is no reason to duplicate the color calculation.
paintReader->SetTextColor(dw_color_from(SkColor4f::FromColor(fRec.fForegroundColor)));
paintReader->SetCustomColorPalette(typeface->fDWPalette.get(), typeface->fPaletteEntryCount);
return this->drawColorV1Paint(canvas, *paintReader, paintElement);
}
bool SkScalerContext_DW::generateColorV1Image(const SkGlyph& glyph, void* imageBuffer) {
SkASSERT(glyph.maskFormat() == SkMask::Format::kARGB32_Format);
SkBitmap dstBitmap;
// TODO: mark this as sRGB when the blits will be sRGB.
dstBitmap.installPixels(
SkImageInfo::Make(glyph.width(), glyph.height(), kN32_SkColorType, kPremul_SkAlphaType),
imageBuffer,
glyph.rowBytes());
SkCanvas canvas(dstBitmap);
if constexpr (kSkShowTextBlitCoverage) {
canvas.clear(0x33FF0000);
} else {
canvas.clear(SK_ColorTRANSPARENT);
}
canvas.translate(-SkIntToScalar(glyph.left()), -SkIntToScalar(glyph.top()));
return this->drawColorV1Image(glyph, canvas);
}
bool SkScalerContext_DW::generateColorV1PaintBounds(
SkMatrix* ctm, SkRect* bounds,
IDWritePaintReader& reader, DWRITE_PAINT_ELEMENT const & element)
{
// Helper to iterate over the specified number of children.
auto boundChildren = [&](UINT32 childCount) -> bool {
if (childCount == 0) {
return true;
}
DWRITE_PAINT_ELEMENT childElement;
HRB(reader.MoveToFirstChild(&childElement));
this->generateColorV1PaintBounds(ctm, bounds, reader, childElement);
for (uint32_t i = 1; i < childCount; ++i) {
HRB(reader.MoveToNextSibling(&childElement));
this->generateColorV1PaintBounds(ctm, bounds, reader, childElement);
}
HRB(reader.MoveToParent());
return true;
};
SkMatrix restoreMatrix = *ctm;
SK_AT_SCOPE_EXIT(*ctm = restoreMatrix);
switch (element.paintType) {
case DWRITE_PAINT_TYPE_NONE:
return false;
case DWRITE_PAINT_TYPE_LAYERS: {
// A layers paint element has a variable number of children.
return boundChildren(element.paint.layers.childCount);
}
case DWRITE_PAINT_TYPE_SOLID_GLYPH: {
// A solid glyph paint element has no children.
// glyphIndex, color.value, color.paletteEntryIndex, color.alpha, color.colorAttributes
SkPathBuilder builder;
SkTScopedComPtr<IDWriteGeometrySink> geometryToPath;
HRBM(SkDWriteGeometrySink::Create(&builder, &geometryToPath),
"Could not create geometry to path converter.");
UINT16 glyphId = SkTo<UINT16>(element.paint.solidGlyph.glyphIndex);
{
Exclusive l(maybe_dw_mutex(*this->getDWriteTypeface()));
HRBM(this->getDWriteTypeface()->fDWriteFontFace->GetGlyphRunOutline(
SkScalarToFloat(fTextSizeRender),
&glyphId,
nullptr, //advances
nullptr, //offsets
1, //num glyphs
FALSE, //sideways
FALSE, //rtl
geometryToPath.get()),
"Could not create glyph outline.");
}
SkMatrix t = *ctm;
t.preConcat(SkMatrix::Scale(1.0f / fTextSizeRender, 1.0f / fTextSizeRender));
builder.transform(t);
bounds->join(builder.detach().getBounds());
return true;
}
case DWRITE_PAINT_TYPE_SOLID: {
return true;
}
case DWRITE_PAINT_TYPE_LINEAR_GRADIENT: {
return true;
}
case DWRITE_PAINT_TYPE_RADIAL_GRADIENT: {
return true;
}
case DWRITE_PAINT_TYPE_SWEEP_GRADIENT: {
return true;
}
case DWRITE_PAINT_TYPE_GLYPH: {
// A glyph paint element has one child, which is the fill for the glyph shape glyphIndex.
SkPathBuilder builder;
SkTScopedComPtr<IDWriteGeometrySink> geometryToPath;
HRBM(SkDWriteGeometrySink::Create(&builder, &geometryToPath),
"Could not create geometry to path converter.");
UINT16 glyphId = SkTo<UINT16>(element.paint.glyph.glyphIndex);
{
Exclusive l(maybe_dw_mutex(*this->getDWriteTypeface()));
HRBM(this->getDWriteTypeface()->fDWriteFontFace->GetGlyphRunOutline(
SkScalarToFloat(fTextSizeRender),
&glyphId,
nullptr, //advances
nullptr, //offsets
1, //num glyphs
FALSE, //sideways
FALSE, //rtl
geometryToPath.get()),
"Could not create glyph outline.");
}
SkMatrix t = *ctm;
t.preConcat(SkMatrix::Scale(1.0f / fTextSizeRender, 1.0f / fTextSizeRender));
builder.transform(t);
bounds->join(builder.detach().getBounds());
return true;
}
case DWRITE_PAINT_TYPE_COLOR_GLYPH: {
// A color glyph paint element has one child, which is the root
// of the paint tree for the glyph specified by glyphIndex.
auto const& colorGlyph = element.paint.colorGlyph;
if (D2D_RECT_F_is_empty(colorGlyph.clipBox)) {
// Does not have a clip box
return boundChildren(1);
}
SkRect r = sk_rect_from(colorGlyph.clipBox);
ctm->mapRect(r);
bounds->join(r);
return true;
}
case DWRITE_PAINT_TYPE_TRANSFORM: {
// A transform paint element always has one child, which is the transformed content.
ctm->preConcat(sk_matrix_from(element.paint.transform));
return boundChildren(1);
}
case DWRITE_PAINT_TYPE_COMPOSITE: {
// A composite paint element has two children, the source and destination of the operation.
return boundChildren(2);
}
default:
return false;
}
}
bool SkScalerContext_DW::generateColorV1Metrics(const SkGlyph& glyph, SkRect* bounds) {
DWriteFontTypeface* typeface = this->getDWriteTypeface();
IDWriteFontFace7* fontFace = typeface->fDWriteFontFace7/*.get()*/;
if (!fontFace) {
return false;
}
UINT32 glyphIndex = glyph.getGlyphID();
SkTScopedComPtr<IDWritePaintReader> paintReader;
HRESULT hr;
// No message on failure here, since this will fail if the font has no color glyphs.
hr = fontFace->CreatePaintReader(DWRITE_GLYPH_IMAGE_FORMATS_COLR_PAINT_TREE,
DWRITE_PAINT_FEATURE_LEVEL_COLR_V1,
&paintReader);
if (FAILED(hr)) {
return false;
}
DWRITE_PAINT_ELEMENT paintElement;
D2D_RECT_F clipBox;
DWRITE_PAINT_ATTRIBUTES attributes;
// If the glyph is not color this will succeed but return paintType NONE.
HRBM(paintReader->SetCurrentGlyph(glyphIndex, &paintElement, &clipBox, &attributes),
"Could not set the current glyph.");
if (paintElement.paintType == DWRITE_PAINT_TYPE_NONE) {
// Does not have paint layers, try another format.
return false;
}
// All coordinates (including top level clip) are reported in "em"s (1 == em).
// Size up all em units to the current size and transform.
SkMatrix matrix = fSkXform;
SkScalar scale = fTextSizeRender;
matrix.preScale(scale, scale);
if (this->isSubpixel()) {
matrix.postTranslate(SkFixedToScalar(glyph.getSubXFixed()),
SkFixedToScalar(glyph.getSubYFixed()));
}
SkRect r;
if (D2D_RECT_F_is_empty(clipBox)) {
// Does not have a clip box.
r = SkRect::MakeEmpty();
if (!this->generateColorV1PaintBounds(&matrix, &r, *paintReader, paintElement)) {
return false;
}
*bounds = r;
} else {
*bounds = sk_rect_from(clipBox);
matrix.mapRect(bounds);
}
return true;
}
#else // DWRITE_CORE || (defined(NTDDI_WIN11_ZN) && NTDDI_VERSION >= NTDDI_WIN11_ZN)
bool SkScalerContext_DW::generateColorV1Metrics(const SkGlyph&, SkRect*) { return false; }
bool SkScalerContext_DW::generateColorV1Image(const SkGlyph&, void*) { return false; }
bool SkScalerContext_DW::drawColorV1Image(const SkGlyph&, SkCanvas&) { return false; }
#endif // DWRITE_CORE || (defined(NTDDI_WIN11_ZN) && NTDDI_VERSION >= NTDDI_WIN11_ZN)
bool SkScalerContext_DW::setAdvance(const SkGlyph& glyph, SkVector* advance) {
*advance = {0, 0};
UINT16 glyphId = glyph.getGlyphID();
DWriteFontTypeface* typeface = this->getDWriteTypeface();
// DirectWrite treats all out of bounds glyph ids as having the same data as glyph 0.
// For consistency with all other backends, treat out of range glyph ids as an error.
if (fGlyphCount <= glyphId) {
return false;
}
DWRITE_GLYPH_METRICS gm;
if (DWRITE_MEASURING_MODE_GDI_CLASSIC == fMeasuringMode ||
DWRITE_MEASURING_MODE_GDI_NATURAL == fMeasuringMode)
{
Exclusive l(maybe_dw_mutex(*typeface));
HRBM(typeface->fDWriteFontFace->GetGdiCompatibleGlyphMetrics(
fTextSizeMeasure,
1.0f, // pixelsPerDip
// This parameter does not act like the lpmat2 parameter to GetGlyphOutlineW.
// If it did then GsA here and G_inv below to mapVectors.
nullptr,
DWRITE_MEASURING_MODE_GDI_NATURAL == fMeasuringMode,
&glyphId, 1,
&gm),
"Could not get gdi compatible glyph metrics.");
} else {
Exclusive l(maybe_dw_mutex(*typeface));
HRBM(typeface->fDWriteFontFace->GetDesignGlyphMetrics(&glyphId, 1, &gm),
"Could not get design metrics.");
}
DWRITE_FONT_METRICS dwfm;
{
Shared l(maybe_dw_mutex(*typeface));
typeface->fDWriteFontFace->GetMetrics(&dwfm);
}
SkScalar advanceX = fTextSizeMeasure * gm.advanceWidth / dwfm.designUnitsPerEm;
*advance = { advanceX, 0 };
if (DWRITE_MEASURING_MODE_GDI_CLASSIC == fMeasuringMode ||
DWRITE_MEASURING_MODE_GDI_NATURAL == fMeasuringMode)
{
// DirectWrite produced 'compatible' metrics, but while close,
// the end result is not always an integer as it would be with GDI.
advance->fX = SkScalarRoundToScalar(advance->fX);
}
*advance = fSkXform.mapVector(*advance);
return true;
}
bool SkScalerContext_DW::generateDWMetrics(const SkGlyph& glyph,
DWRITE_RENDERING_MODE renderingMode,
DWRITE_TEXTURE_TYPE textureType,
SkRect* bounds)
{
DWriteFontTypeface* typeface = this->getDWriteTypeface();
//Measure raster size.
fXform.dx = SkFixedToFloat(glyph.getSubXFixed());
fXform.dy = SkFixedToFloat(glyph.getSubYFixed());
FLOAT advance = 0;
UINT16 glyphId = glyph.getGlyphID();
DWRITE_GLYPH_OFFSET offset;
offset.advanceOffset = 0.0f;
offset.ascenderOffset = 0.0f;
DWRITE_GLYPH_RUN run;
run.glyphCount = 1;
run.glyphAdvances = &advance;
run.fontFace = typeface->fDWriteFontFace.get();
run.fontEmSize = SkScalarToFloat(fTextSizeRender);
run.bidiLevel = 0;
run.glyphIndices = &glyphId;
run.isSideways = FALSE;
run.glyphOffsets = &offset;
SkTScopedComPtr<IDWriteGlyphRunAnalysis> glyphRunAnalysis;
{
Exclusive l(maybe_dw_mutex(*typeface));
// IDWriteFactory2::CreateGlyphRunAnalysis is very bad at aliased glyphs.
if (typeface->fFactory2 &&
(fGridFitMode == DWRITE_GRID_FIT_MODE_DISABLED ||
fAntiAliasMode == DWRITE_TEXT_ANTIALIAS_MODE_GRAYSCALE))
{
HRBM(typeface->fFactory2->CreateGlyphRunAnalysis(
&run,
&fXform,
renderingMode,
fMeasuringMode,
fGridFitMode,
fAntiAliasMode,
0.0f, // baselineOriginX,
0.0f, // baselineOriginY,
&glyphRunAnalysis),
"Could not create DW2 glyph run analysis.");
} else {
HRBM(typeface->fFactory->CreateGlyphRunAnalysis(&run,
1.0f, // pixelsPerDip,
&fXform,
renderingMode,
fMeasuringMode,
0.0f, // baselineOriginX,
0.0f, // baselineOriginY,
&glyphRunAnalysis),
"Could not create glyph run analysis.");
}
}
RECT bbox;
{
Shared l(maybe_dw_mutex(*typeface));
HRBM(glyphRunAnalysis->GetAlphaTextureBounds(textureType, &bbox),
"Could not get texture bounds.");
}
// GetAlphaTextureBounds succeeds but sometimes returns empty bounds like
// { 0x80000000, 0x80000000, 0x80000000, 0x80000000 }
// for small but not quite zero and large (but not really large) glyphs,
// Only set as non-empty if the returned bounds are non-empty.
if (bbox.left >= bbox.right || bbox.top >= bbox.bottom) {
return false;
}
*bounds = SkRect::MakeLTRB(bbox.left, bbox.top, bbox.right, bbox.bottom);
return true;
}
bool SkScalerContext_DW::getColorGlyphRun(const SkGlyph& glyph,
IDWriteColorGlyphRunEnumerator** colorGlyph)
{
FLOAT advance = 0;
UINT16 glyphId = glyph.getGlyphID();
DWRITE_GLYPH_OFFSET offset;
offset.advanceOffset = 0.0f;
offset.ascenderOffset = 0.0f;
DWRITE_GLYPH_RUN run;
run.glyphCount = 1;
run.glyphAdvances = &advance;
run.fontFace = this->getDWriteTypeface()->fDWriteFontFace.get();
run.fontEmSize = SkScalarToFloat(fTextSizeRender);
run.bidiLevel = 0;
run.glyphIndices = &glyphId;
run.isSideways = FALSE;
run.glyphOffsets = &offset;
HRESULT hr = this->getDWriteTypeface()->fFactory2->TranslateColorGlyphRun(
0, 0, &run, nullptr, fMeasuringMode, &fXform, 0, colorGlyph);
if (hr == DWRITE_E_NOCOLOR) {
return false;
}
HRBM(hr, "Failed to translate color glyph run");
return true;
}
bool SkScalerContext_DW::generateColorMetrics(const SkGlyph& glyph, SkRect* bounds) {
SkTScopedComPtr<IDWriteColorGlyphRunEnumerator> colorLayers;
if (!getColorGlyphRun(glyph, &colorLayers)) {
return false;
}
SkASSERT(colorLayers.get());
*bounds = SkRect::MakeEmpty();
BOOL hasNextRun = FALSE;
while (SUCCEEDED(colorLayers->MoveNext(&hasNextRun)) && hasNextRun) {
const DWRITE_COLOR_GLYPH_RUN* colorGlyph;
HRBM(colorLayers->GetCurrentRun(&colorGlyph), "Could not get current color glyph run");
SkPathBuilder builder;
SkTScopedComPtr<IDWriteGeometrySink> geometryToPath;
HRBM(SkDWriteGeometrySink::Create(&builder, &geometryToPath),
"Could not create geometry to path converter.");
{
Exclusive l(maybe_dw_mutex(*this->getDWriteTypeface()));
HRBM(colorGlyph->glyphRun.fontFace->GetGlyphRunOutline(
colorGlyph->glyphRun.fontEmSize,
colorGlyph->glyphRun.glyphIndices,
colorGlyph->glyphRun.glyphAdvances,
colorGlyph->glyphRun.glyphOffsets,
colorGlyph->glyphRun.glyphCount,
colorGlyph->glyphRun.isSideways,
colorGlyph->glyphRun.bidiLevel % 2, //rtl
geometryToPath.get()),
"Could not create glyph outline.");
}
bounds->join(builder.detach().getBounds());
}
SkMatrix matrix = fSkXform;
if (this->isSubpixel()) {
matrix.postTranslate(SkFixedToScalar(glyph.getSubXFixed()),
SkFixedToScalar(glyph.getSubYFixed()));
}
matrix.mapRect(bounds);
return true;
}
bool SkScalerContext_DW::generateSVGMetrics(const SkGlyph& glyph, SkRect* bounds) {
SkPictureRecorder recorder;
SkRect infiniteRect = SkRect::MakeLTRB(-SK_ScalarInfinity, -SK_ScalarInfinity,
SK_ScalarInfinity, SK_ScalarInfinity);
sk_sp<SkBBoxHierarchy> bboxh = SkRTreeFactory()();
SkCanvas* recordingCanvas = recorder.beginRecording(infiniteRect, bboxh);
if (!this->drawSVGImage(glyph, *recordingCanvas)) {
return false;
}
sk_sp<SkPicture> pic = recorder.finishRecordingAsPicture();
*bounds = pic->cullRect();
SkASSERT(bounds->isFinite());
bounds->roundOut(bounds);
return true;
}
namespace {
struct Context {
SkTScopedComPtr<IDWriteFontFace4> fontFace4;
void* glyphDataContext;
Context(IDWriteFontFace4* face4, void* context)
: fontFace4(SkRefComPtr(face4))
, glyphDataContext(context)
{}
};
static void ReleaseProc(const void* ptr, void* context) {
Context* ctx = (Context*)context;
ctx->fontFace4->ReleaseGlyphImageData(ctx->glyphDataContext);
delete ctx;
}
}
static void check_png() {
SkASSERTF(SkCodecs::HasDecoder("png"),
"No PNG decoder registered. A call to SkCodecs::Register is necessary.");
}
bool SkScalerContext_DW::generatePngMetrics(const SkGlyph& glyph, SkRect* bounds) {
IDWriteFontFace4* fontFace4 = this->getDWriteTypeface()->fDWriteFontFace4.get();
if (!fontFace4) {
return false;
}
DWRITE_GLYPH_IMAGE_FORMATS imageFormats;
HRBM(fontFace4->GetGlyphImageFormats(glyph.getGlyphID(), 0, UINT32_MAX, &imageFormats),
"Cannot get glyph image formats.");
if (!(imageFormats & DWRITE_GLYPH_IMAGE_FORMATS_PNG)) {
return false;
}
DWRITE_GLYPH_IMAGE_DATA glyphData;
void* glyphDataContext;
HRBM(fontFace4->GetGlyphImageData(glyph.getGlyphID(),
fTextSizeRender,
DWRITE_GLYPH_IMAGE_FORMATS_PNG,
&glyphData,
&glyphDataContext),
"Glyph image data could not be acquired.");
Context* context = new Context(fontFace4, glyphDataContext);
sk_sp<SkData> data = SkData::MakeWithProc(glyphData.imageData,
glyphData.imageDataSize,
&ReleaseProc,
context);
sk_sp<SkImage> image = SkImages::DeferredFromEncodedData(std::move(data));
if (!image) {
check_png();
return false;
}
SkImageInfo info = image->imageInfo();
*bounds = SkRect::Make(info.bounds());
SkMatrix matrix = fSkXform;
SkScalar scale = fTextSizeRender / glyphData.pixelsPerEm;
matrix.preScale(scale, scale);
matrix.preTranslate(-glyphData.horizontalLeftOrigin.x, -glyphData.horizontalLeftOrigin.y);
if (this->isSubpixel()) {
matrix.postTranslate(SkFixedToScalar(glyph.getSubXFixed()),
SkFixedToScalar(glyph.getSubYFixed()));
}
matrix.mapRect(bounds);
bounds->roundOut(bounds);
return true;
}
SkScalerContext::GlyphMetrics SkScalerContext_DW::generateMetrics(const SkGlyph& glyph,
SkArenaAlloc* alloc) {
GlyphMetrics mx(glyph.maskFormat());
mx.extraBits = ScalerContextBits::NONE;
if (!this->setAdvance(glyph, &mx.advance)) {
return mx;
}
DWriteFontTypeface* typeface = this->getDWriteTypeface();
if (typeface->fIsColorFont) {
if (generateColorV1Metrics(glyph, &mx.bounds)) {
mx.maskFormat = SkMask::kARGB32_Format;
mx.extraBits |= ScalerContextBits::COLRv1;
mx.neverRequestPath = true;
return mx;
}
if (generateColorMetrics(glyph, &mx.bounds)) {
mx.maskFormat = SkMask::kARGB32_Format;
mx.extraBits |= ScalerContextBits::COLR;
mx.neverRequestPath = true;
return mx;
}
if (generateSVGMetrics(glyph, &mx.bounds)) {
mx.maskFormat = SkMask::kARGB32_Format;
mx.extraBits |= ScalerContextBits::SVG;
mx.neverRequestPath = true;
return mx;
}
if (generatePngMetrics(glyph, &mx.bounds)) {
mx.maskFormat = SkMask::kARGB32_Format;
mx.extraBits |= ScalerContextBits::PNG;
mx.neverRequestPath = true;
return mx;
}
}
if (this->generateDWMetrics(glyph, fRenderingMode, fTextureType, &mx.bounds)) {
mx.extraBits = ScalerContextBits::DW;
return mx;
}
// GetAlphaTextureBounds succeeds but returns an empty RECT if there are no
// glyphs of the specified texture type or it is too big for smoothing.
// When this happens, try with the alternate texture type.
if (DWRITE_TEXTURE_ALIASED_1x1 != fTextureType ||
DWRITE_TEXT_ANTIALIAS_MODE_GRAYSCALE == fAntiAliasMode)
{
if (this->generateDWMetrics(glyph,
DWRITE_RENDERING_MODE_ALIASED,
DWRITE_TEXTURE_ALIASED_1x1,
&mx.bounds))
{
mx.maskFormat = SkMask::kBW_Format;
mx.extraBits = ScalerContextBits::DW_1;
return mx;
}
}
// TODO: Try DWRITE_TEXTURE_CLEARTYPE_3x1 if DWRITE_TEXTURE_ALIASED_1x1 fails
// GetAlphaTextureBounds can fail for various reasons.
// As a fallback, attempt to generate the metrics and image from the path.
mx.computeFromPath = true;
mx.extraBits = ScalerContextBits::PATH;
return mx;
}
void SkScalerContext_DW::generateFontMetrics(SkFontMetrics* metrics) {
if (nullptr == metrics) {
return;
}
sk_bzero(metrics, sizeof(*metrics));
IDWriteFontFace* fontFace = this->getDWriteTypeface()->fDWriteFontFace.get();
DWRITE_FONT_METRICS dwfm = {};
if (DWRITE_MEASURING_MODE_GDI_CLASSIC == fMeasuringMode ||
DWRITE_MEASURING_MODE_GDI_NATURAL == fMeasuringMode) {
HRVM(fontFace->GetGdiCompatibleMetrics(fTextSizeRender,
1.0f, // pixelsPerDip
&fXform,
&dwfm),
"Could not initialize DWFM with GDI Compatible Metrics.");
} else {
fontFace->GetMetrics(&dwfm);
}
SkScalar upem = SkIntToScalar(dwfm.designUnitsPerEm);
metrics->fAscent = -fTextSizeRender * SkIntToScalar(dwfm.ascent) / upem;
metrics->fDescent = fTextSizeRender * SkIntToScalar(dwfm.descent) / upem;
metrics->fLeading = fTextSizeRender * SkIntToScalar(dwfm.lineGap) / upem;
metrics->fXHeight = fTextSizeRender * SkIntToScalar(dwfm.xHeight) / upem;
metrics->fCapHeight = fTextSizeRender * SkIntToScalar(dwfm.capHeight) / upem;
metrics->fUnderlineThickness = fTextSizeRender * SkIntToScalar(dwfm.underlineThickness) / upem;
metrics->fUnderlinePosition = -(fTextSizeRender * SkIntToScalar(dwfm.underlinePosition) / upem);
metrics->fStrikeoutThickness = fTextSizeRender * SkIntToScalar(dwfm.strikethroughThickness) / upem;
metrics->fStrikeoutPosition = -(fTextSizeRender * SkIntToScalar(dwfm.strikethroughPosition) / upem);
metrics->fFlags |= SkFontMetrics::kUnderlineThicknessIsValid_Flag;
metrics->fFlags |= SkFontMetrics::kUnderlinePositionIsValid_Flag;
metrics->fFlags |= SkFontMetrics::kStrikeoutThicknessIsValid_Flag;
metrics->fFlags |= SkFontMetrics::kStrikeoutPositionIsValid_Flag;
IDWriteFontFace5* fontFace5 = this->getDWriteTypeface()->fDWriteFontFace5.get();
if (fontFace5 && fontFace5->HasVariations()) {
// The bounds are only valid for the default variation.
metrics->fFlags |= SkFontMetrics::kBoundsInvalid_Flag;
}
IDWriteFontFace1* fontFace1 = this->getDWriteTypeface()->fDWriteFontFace1.get();
if (fontFace1) {
DWRITE_FONT_METRICS1 dwfm1;
fontFace1->GetMetrics(&dwfm1);
metrics->fTop = -fTextSizeRender * SkIntToScalar(dwfm1.glyphBoxTop) / upem;
metrics->fBottom = -fTextSizeRender * SkIntToScalar(dwfm1.glyphBoxBottom) / upem;
metrics->fXMin = fTextSizeRender * SkIntToScalar(dwfm1.glyphBoxLeft) / upem;
metrics->fXMax = fTextSizeRender * SkIntToScalar(dwfm1.glyphBoxRight) / upem;
metrics->fMaxCharWidth = metrics->fXMax - metrics->fXMin;
return;
}
AutoTDWriteTable<SkOTTableHead> head(fontFace);
if (head.fExists &&
head.fSize >= sizeof(SkOTTableHead) &&
head->version == SkOTTableHead::version1)
{
metrics->fTop = -fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->yMax) / upem;
metrics->fBottom = -fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->yMin) / upem;
metrics->fXMin = fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->xMin) / upem;
metrics->fXMax = fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->xMax) / upem;
metrics->fMaxCharWidth = metrics->fXMax - metrics->fXMin;
return;
}
// The real bounds weren't actually available.
metrics->fFlags |= SkFontMetrics::kBoundsInvalid_Flag;
metrics->fTop = metrics->fAscent;
metrics->fBottom = metrics->fDescent;
}
///////////////////////////////////////////////////////////////////////////////
#include "src/core/SkColorData.h"
void SkScalerContext_DW::BilevelToBW(const uint8_t* SK_RESTRICT src,
const SkGlyph& glyph, void* imageBuffer) {
const int width = glyph.width();
const size_t dstRB = (width + 7) >> 3;
uint8_t* SK_RESTRICT dst = static_cast<uint8_t*>(imageBuffer);
int byteCount = width >> 3;
int bitCount = width & 7;
for (int y = 0; y < glyph.height(); ++y) {
if (byteCount > 0) {
for (int i = 0; i < byteCount; ++i) {
unsigned byte = 0;
byte |= src[0] & (1 << 7);
byte |= src[1] & (1 << 6);
byte |= src[2] & (1 << 5);
byte |= src[3] & (1 << 4);
byte |= src[4] & (1 << 3);
byte |= src[5] & (1 << 2);
byte |= src[6] & (1 << 1);
byte |= src[7] & (1 << 0);
dst[i] = byte;
src += 8;
}
}
if (bitCount > 0) {
unsigned byte = 0;
unsigned mask = 0x80;
for (int i = 0; i < bitCount; i++) {
byte |= (src[i]) & mask;
mask >>= 1;
}
dst[byteCount] = byte;
}
src += bitCount;
dst += dstRB;
}
if constexpr (kSkShowTextBlitCoverage) {
dst = static_cast<uint8_t*>(imageBuffer);
for (unsigned y = 0; y < (unsigned)glyph.height(); y += 2) {
for (unsigned x = (y & 0x2); x < (unsigned)glyph.width(); x+=4) {
uint8_t& b = dst[(dstRB * y) + (x >> 3)];
b = b ^ (1 << (0x7 - (x & 0x7)));
}
}
}
}
template<bool APPLY_PREBLEND>
void SkScalerContext_DW::GrayscaleToA8(const uint8_t* SK_RESTRICT src,
const SkGlyph& glyph, void* imageBuffer,
const uint8_t* table8) {
const size_t dstRB = glyph.rowBytes();
const int width = glyph.width();
uint8_t* SK_RESTRICT dst = static_cast<uint8_t*>(imageBuffer);
for (int y = 0; y < glyph.height(); y++) {
for (int i = 0; i < width; i++) {
U8CPU a = *(src++);
dst[i] = sk_apply_lut_if<APPLY_PREBLEND>(a, table8);
if constexpr (kSkShowTextBlitCoverage) {
dst[i] = std::max<U8CPU>(0x30, dst[i]);
}
}
dst = SkTAddOffset<uint8_t>(dst, dstRB);
}
}
template<bool APPLY_PREBLEND>
void SkScalerContext_DW::RGBToA8(const uint8_t* SK_RESTRICT src,
const SkGlyph& glyph, void* imageBuffer,
const uint8_t* table8) {
const size_t dstRB = glyph.rowBytes();
const int width = glyph.width();
uint8_t* SK_RESTRICT dst = static_cast<uint8_t*>(imageBuffer);
for (int y = 0; y < glyph.height(); y++) {
for (int i = 0; i < width; i++) {
U8CPU r = *(src++);
U8CPU g = *(src++);
U8CPU b = *(src++);
dst[i] = sk_apply_lut_if<APPLY_PREBLEND>((r + g + b) / 3, table8);
if constexpr (kSkShowTextBlitCoverage) {
dst[i] = std::max<U8CPU>(0x30, dst[i]);
}
}
dst = SkTAddOffset<uint8_t>(dst, dstRB);
}
}
template<bool APPLY_PREBLEND, bool RGB>
void SkScalerContext_DW::RGBToLcd16(const uint8_t* SK_RESTRICT src, const SkGlyph& glyph,
void* imageBuffer,
const uint8_t* tableR, const uint8_t* tableG,
const uint8_t* tableB) {
const size_t dstRB = glyph.rowBytes();
const int width = glyph.width();
uint16_t* SK_RESTRICT dst = static_cast<uint16_t*>(imageBuffer);
for (int y = 0; y < glyph.height(); y++) {
for (int i = 0; i < width; i++) {
U8CPU r, g, b;
if (RGB) {
r = sk_apply_lut_if<APPLY_PREBLEND>(*(src++), tableR);
g = sk_apply_lut_if<APPLY_PREBLEND>(*(src++), tableG);
b = sk_apply_lut_if<APPLY_PREBLEND>(*(src++), tableB);
} else {
b = sk_apply_lut_if<APPLY_PREBLEND>(*(src++), tableB);
g = sk_apply_lut_if<APPLY_PREBLEND>(*(src++), tableG);
r = sk_apply_lut_if<APPLY_PREBLEND>(*(src++), tableR);
}
if constexpr (kSkShowTextBlitCoverage) {
r = std::max<U8CPU>(0x30, r);
g = std::max<U8CPU>(0x30, g);
b = std::max<U8CPU>(0x30, b);
}
dst[i] = SkPack888ToRGB16(r, g, b);
}
dst = SkTAddOffset<uint16_t>(dst, dstRB);
}
}
const void* SkScalerContext_DW::getDWMaskBits(const SkGlyph& glyph,
DWRITE_RENDERING_MODE renderingMode,
DWRITE_TEXTURE_TYPE textureType)
{
DWriteFontTypeface* typeface = this->getDWriteTypeface();
int sizeNeeded = glyph.width() * glyph.height();
if (DWRITE_TEXTURE_CLEARTYPE_3x1 == textureType) {
sizeNeeded *= 3;
}
if (sizeNeeded > fBits.size()) {
fBits.resize(sizeNeeded);
}
// erase
memset(fBits.begin(), 0, sizeNeeded);
fXform.dx = SkFixedToFloat(glyph.getSubXFixed());
fXform.dy = SkFixedToFloat(glyph.getSubYFixed());
FLOAT advance = 0.0f;
UINT16 index = glyph.getGlyphID();
DWRITE_GLYPH_OFFSET offset;
offset.advanceOffset = 0.0f;
offset.ascenderOffset = 0.0f;
DWRITE_GLYPH_RUN run;
run.glyphCount = 1;
run.glyphAdvances = &advance;
run.fontFace = typeface->fDWriteFontFace.get();
run.fontEmSize = SkScalarToFloat(fTextSizeRender);
run.bidiLevel = 0;
run.glyphIndices = &index;
run.isSideways = FALSE;
run.glyphOffsets = &offset;
{
SkTScopedComPtr<IDWriteGlyphRunAnalysis> glyphRunAnalysis;
{
Exclusive l(maybe_dw_mutex(*typeface));
// IDWriteFactory2::CreateGlyphRunAnalysis is very bad at aliased glyphs.
if (typeface->fFactory2 &&
(fGridFitMode == DWRITE_GRID_FIT_MODE_DISABLED ||
fAntiAliasMode == DWRITE_TEXT_ANTIALIAS_MODE_GRAYSCALE))
{
HRNM(typeface->fFactory2->CreateGlyphRunAnalysis(&run,
&fXform,
renderingMode,
fMeasuringMode,
fGridFitMode,
fAntiAliasMode,
0.0f, // baselineOriginX,
0.0f, // baselineOriginY,
&glyphRunAnalysis),
"Could not create DW2 glyph run analysis.");
} else {
HRNM(typeface->fFactory->CreateGlyphRunAnalysis(&run,
1.0f, // pixelsPerDip,
&fXform,
renderingMode,
fMeasuringMode,
0.0f, // baselineOriginX,
0.0f, // baselineOriginY,
&glyphRunAnalysis),
"Could not create glyph run analysis.");
}
}
//NOTE: this assumes that the glyph has already been measured
//with an exact same glyph run analysis.
RECT bbox;
bbox.left = glyph.left();
bbox.top = glyph.top();
bbox.right = glyph.left() + glyph.width();
bbox.bottom = glyph.top() + glyph.height();
{
Shared l(maybe_dw_mutex(*typeface));
HRNM(glyphRunAnalysis->CreateAlphaTexture(textureType,
&bbox,
fBits.begin(),
sizeNeeded),
"Could not draw mask.");
}
}
return fBits.begin();
}
bool SkScalerContext_DW::generateDWImage(const SkGlyph& glyph, void* imageBuffer) {
//Create the mask.
ScalerContextBits::value_type format = glyph.extraBits();
DWRITE_RENDERING_MODE renderingMode = fRenderingMode;
DWRITE_TEXTURE_TYPE textureType = fTextureType;
if (format == ScalerContextBits::DW_1) {
renderingMode = DWRITE_RENDERING_MODE_ALIASED;
textureType = DWRITE_TEXTURE_ALIASED_1x1;
}
const void* bits = this->getDWMaskBits(glyph, renderingMode, textureType);
if (!bits) {
sk_bzero(imageBuffer, glyph.imageSize());
return false;
}
//Copy the mask into the glyph.
const uint8_t* src = (const uint8_t*)bits;
if (DWRITE_RENDERING_MODE_ALIASED == renderingMode) {
SkASSERT(SkMask::kBW_Format == glyph.maskFormat());
SkASSERT(DWRITE_TEXTURE_ALIASED_1x1 == textureType);
BilevelToBW(src, glyph, imageBuffer);
} else if (!isLCD(fRec)) {
if (textureType == DWRITE_TEXTURE_ALIASED_1x1) {
if (fPreBlend.isApplicable()) {
GrayscaleToA8<true>(src, glyph, imageBuffer, fPreBlend.fG);
} else {
GrayscaleToA8<false>(src, glyph, imageBuffer, fPreBlend.fG);
}
} else {
if (fPreBlend.isApplicable()) {
RGBToA8<true>(src, glyph, imageBuffer, fPreBlend.fG);
} else {
RGBToA8<false>(src, glyph, imageBuffer, fPreBlend.fG);
}
}
} else {
SkASSERT(SkMask::kLCD16_Format == glyph.maskFormat());
if (fPreBlend.isApplicable()) {
if (fRec.fFlags & SkScalerContext::kLCD_BGROrder_Flag) {
RGBToLcd16<true, false>(src, glyph, imageBuffer,
fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
} else {
RGBToLcd16<true, true>(src, glyph, imageBuffer,
fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
}
} else {
if (fRec.fFlags & SkScalerContext::kLCD_BGROrder_Flag) {
RGBToLcd16<false, false>(src, glyph, imageBuffer,
fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
} else {
RGBToLcd16<false, true>(src, glyph, imageBuffer,
fPreBlend.fR, fPreBlend.fG, fPreBlend.fB);
}
}
}
return true;
}
bool SkScalerContext_DW::drawColorImage(const SkGlyph& glyph, SkCanvas& canvas) {
SkTScopedComPtr<IDWriteColorGlyphRunEnumerator> colorLayers;
if (!getColorGlyphRun(glyph, &colorLayers)) {
SkASSERTF(false, "Could not get color layers");
return false;
}
SkPaint paint;
paint.setAntiAlias(fRenderingMode != DWRITE_RENDERING_MODE_ALIASED);
if (this->isSubpixel()) {
canvas.translate(SkFixedToScalar(glyph.getSubXFixed()),
SkFixedToScalar(glyph.getSubYFixed()));
}
canvas.concat(fSkXform);
DWriteFontTypeface* typeface = this->getDWriteTypeface();
size_t paletteEntryCount = typeface->fPaletteEntryCount;
SkColor* palette = typeface->fPalette.get();
BOOL hasNextRun = FALSE;
while (SUCCEEDED(colorLayers->MoveNext(&hasNextRun)) && hasNextRun) {
const DWRITE_COLOR_GLYPH_RUN* colorGlyph;
HRBM(colorLayers->GetCurrentRun(&colorGlyph), "Could not get current color glyph run");
SkColor color;
if (colorGlyph->paletteIndex == 0xffff) {
color = fRec.fForegroundColor;
} else if (colorGlyph->paletteIndex < paletteEntryCount) {
color = palette[colorGlyph->paletteIndex];
} else {
SK_TRACEHR(DWRITE_E_NOCOLOR, "Invalid palette index.");
color = SK_ColorBLACK;
}
paint.setColor(color);
SkPathBuilder builder;
SkTScopedComPtr<IDWriteGeometrySink> geometryToPath;
HRBM(SkDWriteGeometrySink::Create(&builder, &geometryToPath),
"Could not create geometry to path converter.");
{
Exclusive l(maybe_dw_mutex(*this->getDWriteTypeface()));
HRBM(colorGlyph->glyphRun.fontFace->GetGlyphRunOutline(
colorGlyph->glyphRun.fontEmSize,
colorGlyph->glyphRun.glyphIndices,
colorGlyph->glyphRun.glyphAdvances,
colorGlyph->glyphRun.glyphOffsets,
colorGlyph->glyphRun.glyphCount,
colorGlyph->glyphRun.isSideways,
colorGlyph->glyphRun.bidiLevel % 2, //rtl
geometryToPath.get()),
"Could not create glyph outline.");
}
canvas.drawPath(builder.detach(), paint);
}
return true;
}
bool SkScalerContext_DW::generateColorImage(const SkGlyph& glyph, void* imageBuffer) {
SkASSERT(glyph.maskFormat() == SkMask::Format::kARGB32_Format);
SkBitmap dstBitmap;
// TODO: mark this as sRGB when the blits will be sRGB.
dstBitmap.installPixels(
SkImageInfo::Make(glyph.width(), glyph.height(), kN32_SkColorType, kPremul_SkAlphaType),
imageBuffer,
glyph.rowBytes());
SkCanvas canvas(dstBitmap);
if constexpr (kSkShowTextBlitCoverage) {
canvas.clear(0x33FF0000);
} else {
canvas.clear(SK_ColorTRANSPARENT);
}
canvas.translate(-SkIntToScalar(glyph.left()), -SkIntToScalar(glyph.top()));
return this->drawColorImage(glyph, canvas);
}
bool SkScalerContext_DW::drawSVGImage(const SkGlyph& glyph, SkCanvas& canvas) {
DWriteFontTypeface* typeface = this->getDWriteTypeface();
IDWriteFontFace4* fontFace4 = typeface->fDWriteFontFace4.get();
if (!fontFace4) {
return false;
}
DWRITE_GLYPH_IMAGE_FORMATS imageFormats;
HRBM(fontFace4->GetGlyphImageFormats(glyph.getGlyphID(), 0, UINT32_MAX, &imageFormats),
"Cannot get glyph image formats.");
if (!(imageFormats & DWRITE_GLYPH_IMAGE_FORMATS_SVG)) {
return false;
}
SkGraphics::OpenTypeSVGDecoderFactory svgFactory = SkGraphics::GetOpenTypeSVGDecoderFactory();
if (!svgFactory) {
return false;
}
DWRITE_GLYPH_IMAGE_DATA glyphData;
void* glyphDataContext;
HRBM(fontFace4->GetGlyphImageData(glyph.getGlyphID(),
fTextSizeRender,
DWRITE_GLYPH_IMAGE_FORMATS_SVG,
&glyphData,
&glyphDataContext),
"Glyph SVG data could not be acquired.");
auto svgDecoder = svgFactory((const uint8_t*)glyphData.imageData, glyphData.imageDataSize);
fontFace4->ReleaseGlyphImageData(glyphDataContext);
if (!svgDecoder) {
return false;
}
size_t paletteEntryCount = typeface->fPaletteEntryCount;
SkColor* palette = typeface->fPalette.get();
int upem = typeface->getUnitsPerEm();
SkMatrix matrix = fSkXform;
SkScalar scale = fTextSizeRender / upem;
matrix.preScale(scale, scale);
matrix.preTranslate(-glyphData.horizontalLeftOrigin.x, -glyphData.horizontalLeftOrigin.y);
if (this->isSubpixel()) {
matrix.postTranslate(SkFixedToScalar(glyph.getSubXFixed()),
SkFixedToScalar(glyph.getSubYFixed()));
}
canvas.concat(matrix);
return svgDecoder->render(canvas, upem, glyph.getGlyphID(),
fRec.fForegroundColor, SkSpan(palette, paletteEntryCount));
}
bool SkScalerContext_DW::generateSVGImage(const SkGlyph& glyph, void* imageBuffer) {
SkASSERT(glyph.maskFormat() == SkMask::Format::kARGB32_Format);
SkBitmap dstBitmap;
// TODO: mark this as sRGB when the blits will be sRGB.
dstBitmap.installPixels(
SkImageInfo::Make(glyph.width(), glyph.height(), kN32_SkColorType, kPremul_SkAlphaType),
imageBuffer,
glyph.rowBytes());
SkCanvas canvas(dstBitmap);
if constexpr (kSkShowTextBlitCoverage) {
canvas.clear(0x33FF0000);
} else {
canvas.clear(SK_ColorTRANSPARENT);
}
canvas.translate(-SkIntToScalar(glyph.left()), -SkIntToScalar(glyph.top()));
return this->drawSVGImage(glyph, canvas);
}
bool SkScalerContext_DW::drawPngImage(const SkGlyph& glyph, SkCanvas& canvas) {
IDWriteFontFace4* fontFace4 = this->getDWriteTypeface()->fDWriteFontFace4.get();
if (!fontFace4) {
return false;
}
DWRITE_GLYPH_IMAGE_DATA glyphData;
void* glyphDataContext;
HRBM(fontFace4->GetGlyphImageData(glyph.getGlyphID(),
fTextSizeRender,
DWRITE_GLYPH_IMAGE_FORMATS_PNG,
&glyphData,
&glyphDataContext),
"Glyph image data could not be acquired.");
Context* context = new Context(fontFace4, glyphDataContext);
sk_sp<SkData> data = SkData::MakeWithProc(glyphData.imageData,
glyphData.imageDataSize,
&ReleaseProc,
context);
sk_sp<SkImage> image = SkImages::DeferredFromEncodedData(std::move(data));
if (!image) {
check_png();
return false;
}
if (this->isSubpixel()) {
canvas.translate(SkFixedToScalar(glyph.getSubXFixed()),
SkFixedToScalar(glyph.getSubYFixed()));
}
canvas.concat(fSkXform);
SkScalar ratio = fTextSizeRender / glyphData.pixelsPerEm;
canvas.scale(ratio, ratio);
canvas.translate(-glyphData.horizontalLeftOrigin.x, -glyphData.horizontalLeftOrigin.y);
canvas.drawImage(image, 0, 0);
return true;
}
bool SkScalerContext_DW::generatePngImage(const SkGlyph& glyph, void* imageBuffer) {
SkASSERT(glyph.maskFormat() == SkMask::Format::kARGB32_Format);
SkBitmap dstBitmap;
dstBitmap.installPixels(
SkImageInfo::Make(glyph.width(), glyph.height(), kN32_SkColorType, kPremul_SkAlphaType),
imageBuffer,
glyph.rowBytes());
SkCanvas canvas(dstBitmap);
canvas.clear(SK_ColorTRANSPARENT);
canvas.translate(-glyph.left(), -glyph.top());
return this->drawPngImage(glyph, canvas);
}
void SkScalerContext_DW::generateImage(const SkGlyph& glyph, void* imageBuffer) {
ScalerContextBits::value_type format = glyph.extraBits();
if (format == ScalerContextBits::DW ||
format == ScalerContextBits::DW_1)
{
this->generateDWImage(glyph, imageBuffer);
} else if (format == ScalerContextBits::COLRv1) {
this->generateColorV1Image(glyph, imageBuffer);
} else if (format == ScalerContextBits::COLR) {
this->generateColorImage(glyph, imageBuffer);
} else if (format == ScalerContextBits::SVG) {
this->generateSVGImage(glyph, imageBuffer);
} else if (format == ScalerContextBits::PNG) {
this->generatePngImage(glyph, imageBuffer);
} else if (format == ScalerContextBits::PATH) {
this->generateImageFromPath(glyph, imageBuffer);
} else {
SK_ABORT("Bad format");
}
}
std::optional<SkScalerContext::GeneratedPath>
SkScalerContext_DW::generatePath(const SkGlyph& glyph) {
SkGlyphID glyphID = glyph.getGlyphID();
// DirectWrite treats all out of bounds glyph ids as having the same data as glyph 0.
// For consistency with all other backends, treat out of range glyph ids as an error.
if (fGlyphCount <= glyphID) {
return {};
}
SkPathBuilder builder;
SkTScopedComPtr<IDWriteGeometrySink> geometryToPath;
HR_GENERAL(SkDWriteGeometrySink::Create(&builder, &geometryToPath),
"Could not create geometry to path converter.", {});
UINT16 glyphId = SkTo<UINT16>(glyphID);
{
Exclusive l(maybe_dw_mutex(*this->getDWriteTypeface()));
//TODO: convert to<->from DIUs? This would make a difference if hinting.
//It may not be needed, it appears that DirectWrite only hints at em size.
HR_GENERAL(this->getDWriteTypeface()->fDWriteFontFace->GetGlyphRunOutline(
SkScalarToFloat(fTextSizeRender),
&glyphId,
nullptr, //advances
nullptr, //offsets
1, //num glyphs
FALSE, //sideways
FALSE, //rtl
geometryToPath.get()),
"Could not create glyph outline.", {});
}
builder.transform(fSkXform);
return {{builder.detach(), false}};
}
sk_sp<SkDrawable> SkScalerContext_DW::generateDrawable(const SkGlyph& glyph) {
struct GlyphDrawable : public SkDrawable {
SkScalerContext_DW* fSelf;
SkGlyph fGlyph;
GlyphDrawable(SkScalerContext_DW* self, const SkGlyph& glyph) : fSelf(self), fGlyph(glyph){}
SkRect onGetBounds() override { return fGlyph.rect(); }
size_t onApproximateBytesUsed() override { return sizeof(GlyphDrawable); }
void maybeShowTextBlitCoverage(SkCanvas* canvas) {
if constexpr (kSkShowTextBlitCoverage) {
SkPaint paint;
paint.setColor(0x3300FF00);
paint.setStyle(SkPaint::kFill_Style);
canvas->drawRect(this->onGetBounds(), paint);
}
}
};
struct COLRv1GlyphDrawable : public GlyphDrawable {
using GlyphDrawable::GlyphDrawable;
void onDraw(SkCanvas* canvas) override {
this->maybeShowTextBlitCoverage(canvas);
fSelf->drawColorV1Image(fGlyph, *canvas);
}
};
struct COLRGlyphDrawable : public GlyphDrawable {
using GlyphDrawable::GlyphDrawable;
void onDraw(SkCanvas* canvas) override {
this->maybeShowTextBlitCoverage(canvas);
fSelf->drawColorImage(fGlyph, *canvas);
}
};
struct SVGGlyphDrawable : public GlyphDrawable {
using GlyphDrawable::GlyphDrawable;
void onDraw(SkCanvas* canvas) override {
this->maybeShowTextBlitCoverage(canvas);
fSelf->drawSVGImage(fGlyph, *canvas);
}
};
ScalerContextBits::value_type format = glyph.extraBits();
if (format == ScalerContextBits::COLRv1) {
return sk_sp<SkDrawable>(new COLRv1GlyphDrawable(this, glyph));
}
if (format == ScalerContextBits::COLR) {
return sk_sp<SkDrawable>(new COLRGlyphDrawable(this, glyph));
}
if (format == ScalerContextBits::SVG) {
return sk_sp<SkDrawable>(new SVGGlyphDrawable(this, glyph));
}
return nullptr;
}
#endif//defined(SK_BUILD_FOR_WIN)