Magic-Mirror/gecko-dev
1
0
Fork 0
mirror of https://github.com/mozilla/gecko-dev.git synced 2024-12-03 02:25:34 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
ab00497b2b
gecko-dev/gfx/2d/ScaledFontFontconfig.cpp
Emilio Cobos Álvarez cb19991fd7 Bug 1533142 - Use more cbindgen features. r=kats 
We can get back the fancy flag syntax as soon as we get C++17 inline variables,
which I sent an email to dev-platform@ about, with no reply.

Differential Revision: https://phabricator.services.mozilla.com/D22382

--HG--
extra : moz-landing-system : lando
2019-03-06 23:01:11 +00:00

598 lines
20 KiB
C++
Raw Blame History

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ScaledFontFontconfig.h"
#include "UnscaledFontFreeType.h"
#include "NativeFontResourceFreeType.h"
#include "Logging.h"
#include "StackArray.h"
#include "mozilla/webrender/WebRenderTypes.h"
#ifdef USE_SKIA
# include "skia/include/ports/SkTypeface_cairo.h"
#endif
#include <fontconfig/fcfreetype.h>
#include FT_MULTIPLE_MASTERS_H
namespace mozilla {
namespace gfx {
// On Linux and Android our "platform" font is a cairo_scaled_font_t and we use
// an SkFontHost implementation that allows Skia to render using this.
// This is mainly because FT_Face is not good for sharing between libraries,
// which is a requirement when we consider runtime switchable backends and so on
ScaledFontFontconfig::ScaledFontFontconfig(
cairo_scaled_font_t* aScaledFont, FcPattern* aPattern,
const RefPtr<UnscaledFont>& aUnscaledFont, Float aSize)
: ScaledFontBase(aUnscaledFont, aSize), mPattern(aPattern) {
SetCairoScaledFont(aScaledFont);
FcPatternReference(aPattern);
}
ScaledFontFontconfig::~ScaledFontFontconfig() { FcPatternDestroy(mPattern); }
#ifdef USE_SKIA
SkTypeface* ScaledFontFontconfig::CreateSkTypeface() {
return SkCreateTypefaceFromCairoFTFontWithFontconfig(mScaledFont, mPattern);
}
#endif
ScaledFontFontconfig::InstanceData::InstanceData(
cairo_scaled_font_t* aScaledFont, FcPattern* aPattern)
: mFlags(0),
mHintStyle(FC_HINT_NONE),
mSubpixelOrder(FC_RGBA_UNKNOWN),
mLcdFilter(FC_LCD_LEGACY) {
// Record relevant Fontconfig properties into instance data.
FcBool autohint;
if (FcPatternGetBool(aPattern, FC_AUTOHINT, 0, &autohint) == FcResultMatch &&
autohint) {
mFlags |= AUTOHINT;
}
FcBool bitmap;
if (FcPatternGetBool(aPattern, FC_EMBEDDED_BITMAP, 0, &bitmap) ==
FcResultMatch &&
bitmap) {
mFlags |= EMBEDDED_BITMAP;
}
FcBool embolden;
if (FcPatternGetBool(aPattern, FC_EMBOLDEN, 0, &embolden) == FcResultMatch &&
embolden) {
mFlags |= EMBOLDEN;
}
FcBool vertical;
if (FcPatternGetBool(aPattern, FC_VERTICAL_LAYOUT, 0, &vertical) ==
FcResultMatch &&
vertical) {
mFlags |= VERTICAL_LAYOUT;
}
FcBool antialias;
if (FcPatternGetBool(aPattern, FC_ANTIALIAS, 0, &antialias) !=
FcResultMatch ||
antialias) {
mFlags |= ANTIALIAS;
// Only record subpixel order and lcd filtering if antialiasing is enabled.
int rgba;
if (FcPatternGetInteger(aPattern, FC_RGBA, 0, &rgba) == FcResultMatch) {
mSubpixelOrder = rgba;
}
int filter;
if (FcPatternGetInteger(aPattern, FC_LCD_FILTER, 0, &filter) ==
FcResultMatch) {
mLcdFilter = filter;
}
}
cairo_font_options_t* fontOptions = cairo_font_options_create();
cairo_scaled_font_get_font_options(aScaledFont, fontOptions);
// For printer fonts, Cairo hint metrics and hinting will be disabled.
// For other fonts, allow hint metrics and hinting.
if (cairo_font_options_get_hint_metrics(fontOptions) !=
CAIRO_HINT_METRICS_OFF) {
mFlags |= HINT_METRICS;
FcBool hinting;
if (FcPatternGetBool(aPattern, FC_HINTING, 0, &hinting) != FcResultMatch ||
hinting) {
int hintstyle;
if (FcPatternGetInteger(aPattern, FC_HINT_STYLE, 0, &hintstyle) !=
FcResultMatch) {
hintstyle = FC_HINT_FULL;
}
mHintStyle = hintstyle;
}
}
cairo_font_options_destroy(fontOptions);
}
ScaledFontFontconfig::InstanceData::InstanceData(
const wr::FontInstanceOptions* aOptions,
const wr::FontInstancePlatformOptions* aPlatformOptions)
: mFlags(HINT_METRICS),
mHintStyle(FC_HINT_FULL),
mSubpixelOrder(FC_RGBA_UNKNOWN),
mLcdFilter(FC_LCD_LEGACY) {
if (aOptions) {
if (aOptions->flags & wr::FontInstanceFlags_FORCE_AUTOHINT) {
mFlags |= AUTOHINT;
}
if (aOptions->flags & wr::FontInstanceFlags_EMBEDDED_BITMAPS) {
mFlags |= EMBEDDED_BITMAP;
}
if (aOptions->flags & wr::FontInstanceFlags_SYNTHETIC_BOLD) {
mFlags |= EMBOLDEN;
}
if (aOptions->flags & wr::FontInstanceFlags_VERTICAL_LAYOUT) {
mFlags |= VERTICAL_LAYOUT;
}
if (aOptions->render_mode != wr::FontRenderMode::Mono) {
mFlags |= ANTIALIAS;
if (aOptions->render_mode == wr::FontRenderMode::Subpixel) {
if (aOptions->flags & wr::FontInstanceFlags_SUBPIXEL_BGR) {
mSubpixelOrder = aOptions->flags & wr::FontInstanceFlags_LCD_VERTICAL
? FC_RGBA_VBGR
: FC_RGBA_BGR;
} else {
mSubpixelOrder = aOptions->flags & wr::FontInstanceFlags_LCD_VERTICAL
? FC_RGBA_VRGB
: FC_RGBA_RGB;
}
}
}
}
if (aPlatformOptions) {
switch (aPlatformOptions->hinting) {
case wr::FontHinting::None:
mHintStyle = FC_HINT_NONE;
break;
case wr::FontHinting::Light:
mHintStyle = FC_HINT_SLIGHT;
break;
case wr::FontHinting::Normal:
mHintStyle = FC_HINT_MEDIUM;
break;
default:
break;
}
switch (aPlatformOptions->lcd_filter) {
case wr::FontLCDFilter::None:
mLcdFilter = FC_LCD_NONE;
break;
case wr::FontLCDFilter::Default:
mLcdFilter = FC_LCD_DEFAULT;
break;
case wr::FontLCDFilter::Light:
mLcdFilter = FC_LCD_LIGHT;
break;
default:
break;
}
}
}
void ScaledFontFontconfig::InstanceData::SetupPattern(
FcPattern* aPattern) const {
if (mFlags & AUTOHINT) {
FcPatternAddBool(aPattern, FC_AUTOHINT, FcTrue);
}
if (mFlags & EMBEDDED_BITMAP) {
FcPatternAddBool(aPattern, FC_EMBEDDED_BITMAP, FcTrue);
}
if (mFlags & EMBOLDEN) {
FcPatternAddBool(aPattern, FC_EMBOLDEN, FcTrue);
}
if (mFlags & VERTICAL_LAYOUT) {
FcPatternAddBool(aPattern, FC_VERTICAL_LAYOUT, FcTrue);
}
if (mFlags & ANTIALIAS) {
FcPatternAddBool(aPattern, FC_ANTIALIAS, FcTrue);
if (mSubpixelOrder != FC_RGBA_UNKNOWN) {
FcPatternAddInteger(aPattern, FC_RGBA, mSubpixelOrder);
}
if (mLcdFilter != FC_LCD_LEGACY) {
FcPatternAddInteger(aPattern, FC_LCD_FILTER, mLcdFilter);
}
} else {
FcPatternAddBool(aPattern, FC_ANTIALIAS, FcFalse);
}
if (mHintStyle) {
FcPatternAddBool(aPattern, FC_HINTING, FcTrue);
FcPatternAddInteger(aPattern, FC_HINT_STYLE, mHintStyle);
} else {
FcPatternAddBool(aPattern, FC_HINTING, FcFalse);
}
}
void ScaledFontFontconfig::InstanceData::SetupFontOptions(
cairo_font_options_t* aFontOptions) const {
// Try to build a sane initial set of Cairo font options based on the
// Fontconfig pattern.
if (mFlags & HINT_METRICS) {
// For regular (non-printer) fonts, enable hint metrics as well as hinting
// and (possibly subpixel) antialiasing.
cairo_font_options_set_hint_metrics(aFontOptions, CAIRO_HINT_METRICS_ON);
cairo_hint_style_t hinting;
switch (mHintStyle) {
case FC_HINT_NONE:
hinting = CAIRO_HINT_STYLE_NONE;
break;
case FC_HINT_SLIGHT:
hinting = CAIRO_HINT_STYLE_SLIGHT;
break;
case FC_HINT_MEDIUM:
default:
hinting = CAIRO_HINT_STYLE_MEDIUM;
break;
case FC_HINT_FULL:
hinting = CAIRO_HINT_STYLE_FULL;
break;
}
cairo_font_options_set_hint_style(aFontOptions, hinting);
if (mFlags & ANTIALIAS) {
cairo_subpixel_order_t subpixel = CAIRO_SUBPIXEL_ORDER_DEFAULT;
switch (mSubpixelOrder) {
case FC_RGBA_RGB:
subpixel = CAIRO_SUBPIXEL_ORDER_RGB;
break;
case FC_RGBA_BGR:
subpixel = CAIRO_SUBPIXEL_ORDER_BGR;
break;
case FC_RGBA_VRGB:
subpixel = CAIRO_SUBPIXEL_ORDER_VRGB;
break;
case FC_RGBA_VBGR:
subpixel = CAIRO_SUBPIXEL_ORDER_VBGR;
break;
default:
break;
}
if (subpixel != CAIRO_SUBPIXEL_ORDER_DEFAULT) {
cairo_font_options_set_antialias(aFontOptions,
CAIRO_ANTIALIAS_SUBPIXEL);
cairo_font_options_set_subpixel_order(aFontOptions, subpixel);
} else {
cairo_font_options_set_antialias(aFontOptions, CAIRO_ANTIALIAS_GRAY);
}
} else {
cairo_font_options_set_antialias(aFontOptions, CAIRO_ANTIALIAS_NONE);
}
} else {
// For printer fonts, disable hint metrics and hinting. Don't allow subpixel
// antialiasing.
cairo_font_options_set_hint_metrics(aFontOptions, CAIRO_HINT_METRICS_OFF);
cairo_font_options_set_hint_style(aFontOptions, CAIRO_HINT_STYLE_NONE);
cairo_font_options_set_antialias(aFontOptions, mFlags & ANTIALIAS
? CAIRO_ANTIALIAS_GRAY
: CAIRO_ANTIALIAS_NONE);
}
}
bool ScaledFontFontconfig::GetFontInstanceData(FontInstanceDataOutput aCb,
void* aBaton) {
InstanceData instance(GetCairoScaledFont(), mPattern);
std::vector<FontVariation> variations;
if (HasVariationSettings()) {
FT_Face face = nullptr;
if (FcPatternGetFTFace(mPattern, FC_FT_FACE, 0, &face) == FcResultMatch) {
UnscaledFontFreeType::GetVariationSettingsFromFace(&variations, face);
}
}
aCb(reinterpret_cast<uint8_t*>(&instance), sizeof(instance),
variations.data(), variations.size(), aBaton);
return true;
}
bool ScaledFontFontconfig::GetWRFontInstanceOptions(
Maybe<wr::FontInstanceOptions>* aOutOptions,
Maybe<wr::FontInstancePlatformOptions>* aOutPlatformOptions,
std::vector<FontVariation>* aOutVariations) {
wr::FontInstanceOptions options;
options.render_mode = wr::FontRenderMode::Alpha;
// FIXME: Cairo-FT metrics are not compatible with subpixel positioning.
// options.flags = wr::FontInstanceFlags_SUBPIXEL_POSITION;
options.flags = wr::FontInstanceFlags{0};
options.bg_color = wr::ToColorU(Color());
options.synthetic_italics =
wr::DegreesToSyntheticItalics(GetSyntheticObliqueAngle());
wr::FontInstancePlatformOptions platformOptions;
platformOptions.lcd_filter = wr::FontLCDFilter::Legacy;
platformOptions.hinting = wr::FontHinting::Normal;
FcBool autohint;
if (FcPatternGetBool(mPattern, FC_AUTOHINT, 0, &autohint) == FcResultMatch &&
autohint) {
options.flags |= wr::FontInstanceFlags_FORCE_AUTOHINT;
}
FcBool embolden;
if (FcPatternGetBool(mPattern, FC_EMBOLDEN, 0, &embolden) == FcResultMatch &&
embolden) {
options.flags |= wr::FontInstanceFlags_SYNTHETIC_BOLD;
}
FcBool vertical;
if (FcPatternGetBool(mPattern, FC_VERTICAL_LAYOUT, 0, &vertical) ==
FcResultMatch &&
vertical) {
options.flags |= wr::FontInstanceFlags_VERTICAL_LAYOUT;
}
FcBool antialias;
if (FcPatternGetBool(mPattern, FC_ANTIALIAS, 0, &antialias) !=
FcResultMatch ||
antialias) {
int rgba;
if (FcPatternGetInteger(mPattern, FC_RGBA, 0, &rgba) == FcResultMatch) {
switch (rgba) {
case FC_RGBA_RGB:
case FC_RGBA_BGR:
case FC_RGBA_VRGB:
case FC_RGBA_VBGR:
options.render_mode = wr::FontRenderMode::Subpixel;
if (rgba == FC_RGBA_VRGB || rgba == FC_RGBA_VBGR) {
options.flags |= wr::FontInstanceFlags_LCD_VERTICAL;
}
platformOptions.hinting = wr::FontHinting::LCD;
if (rgba == FC_RGBA_BGR || rgba == FC_RGBA_VBGR) {
options.flags |= wr::FontInstanceFlags_SUBPIXEL_BGR;
}
break;
case FC_RGBA_NONE:
case FC_RGBA_UNKNOWN:
default:
break;
}
}
if (options.render_mode == wr::FontRenderMode::Subpixel) {
int filter;
if (FcPatternGetInteger(mPattern, FC_LCD_FILTER, 0, &filter) ==
FcResultMatch) {
switch (filter) {
case FC_LCD_NONE:
platformOptions.lcd_filter = wr::FontLCDFilter::None;
break;
case FC_LCD_DEFAULT:
platformOptions.lcd_filter = wr::FontLCDFilter::Default;
break;
case FC_LCD_LIGHT:
platformOptions.lcd_filter = wr::FontLCDFilter::Light;
break;
case FC_LCD_LEGACY:
default:
break;
}
}
}
// Match cairo-ft's handling of embeddedbitmap:
// If AA is explicitly disabled, leave bitmaps enabled.
// Otherwise, disable embedded bitmaps unless explicitly enabled.
FcBool bitmap;
if (FcPatternGetBool(mPattern, FC_EMBEDDED_BITMAP, 0, &bitmap) ==
FcResultMatch &&
bitmap) {
options.flags |= wr::FontInstanceFlags_EMBEDDED_BITMAPS;
}
} else {
options.render_mode = wr::FontRenderMode::Mono;
platformOptions.hinting = wr::FontHinting::Mono;
options.flags |= wr::FontInstanceFlags_EMBEDDED_BITMAPS;
}
FcBool hinting;
int hintstyle;
if (FcPatternGetBool(mPattern, FC_HINTING, 0, &hinting) != FcResultMatch ||
hinting) {
if (FcPatternGetInteger(mPattern, FC_HINT_STYLE, 0, &hintstyle) !=
FcResultMatch) {
hintstyle = FC_HINT_FULL;
}
} else {
hintstyle = FC_HINT_NONE;
}
if (hintstyle == FC_HINT_NONE) {
platformOptions.hinting = wr::FontHinting::None;
} else if (options.render_mode != wr::FontRenderMode::Mono) {
switch (hintstyle) {
case FC_HINT_SLIGHT:
platformOptions.hinting = wr::FontHinting::Light;
break;
case FC_HINT_MEDIUM:
platformOptions.hinting = wr::FontHinting::Normal;
break;
case FC_HINT_FULL:
default:
break;
}
}
*aOutOptions = Some(options);
*aOutPlatformOptions = Some(platformOptions);
if (HasVariationSettings()) {
FT_Face face = nullptr;
if (FcPatternGetFTFace(mPattern, FC_FT_FACE, 0, &face) == FcResultMatch) {
UnscaledFontFreeType::GetVariationSettingsFromFace(aOutVariations, face);
}
}
return true;
}
static cairo_user_data_key_t sNativeFontResourceKey;
static void ReleaseNativeFontResource(void* aData) {
static_cast<NativeFontResource*>(aData)->Release();
}
static cairo_user_data_key_t sFaceKey;
static void ReleaseFace(void* aData) {
Factory::ReleaseFTFace(static_cast<FT_Face>(aData));
}
already_AddRefed<ScaledFont> UnscaledFontFontconfig::CreateScaledFont(
Float aSize, const uint8_t* aInstanceData, uint32_t aInstanceDataLength,
const FontVariation* aVariations, uint32_t aNumVariations) {
if (aInstanceDataLength < sizeof(ScaledFontFontconfig::InstanceData)) {
gfxWarning() << "Fontconfig scaled font instance data is truncated.";
return nullptr;
}
const ScaledFontFontconfig::InstanceData& instanceData =
*reinterpret_cast<const ScaledFontFontconfig::InstanceData*>(
aInstanceData);
FcPattern* pattern = FcPatternCreate();
if (!pattern) {
gfxWarning() << "Failed initializing Fontconfig pattern for scaled font";
return nullptr;
}
FT_Face face = GetFace();
NativeFontResourceFreeType* nfr =
static_cast<NativeFontResourceFreeType*>(mNativeFontResource.get());
FT_Face varFace = nullptr;
if (face) {
if (nfr && aNumVariations > 0) {
varFace = nfr->CloneFace();
if (!varFace) {
gfxWarning() << "Failed cloning face for variations";
}
}
FcPatternAddFTFace(pattern, FC_FT_FACE, varFace ? varFace : face);
} else {
FcPatternAddString(pattern, FC_FILE,
reinterpret_cast<const FcChar8*>(GetFile()));
FcPatternAddInteger(pattern, FC_INDEX, GetIndex());
}
FcPatternAddDouble(pattern, FC_PIXEL_SIZE, aSize);
instanceData.SetupPattern(pattern);
StackArray<FT_Fixed, 32> coords(aNumVariations);
for (uint32_t i = 0; i < aNumVariations; i++) {
coords[i] = std::round(aVariations[i].mValue * 65536.0);
}
cairo_font_face_t* font = cairo_ft_font_face_create_for_pattern(
pattern, coords.data(), aNumVariations);
if (cairo_font_face_status(font) != CAIRO_STATUS_SUCCESS) {
gfxWarning() << "Failed creating Cairo font face for Fontconfig pattern";
FcPatternDestroy(pattern);
if (varFace) {
Factory::ReleaseFTFace(varFace);
}
return nullptr;
}
if (nfr) {
// Bug 1362117 - Cairo may keep the font face alive after the owning
// NativeFontResource was freed. To prevent this, we must bind the
// NativeFontResource to the font face so that it stays alive at least as
// long as the font face.
nfr->AddRef();
cairo_status_t err = CAIRO_STATUS_SUCCESS;
bool cleanupFace = false;
if (varFace) {
err =
cairo_font_face_set_user_data(font, &sFaceKey, varFace, ReleaseFace);
}
if (err != CAIRO_STATUS_SUCCESS) {
cleanupFace = true;
} else {
err = cairo_font_face_set_user_data(font, &sNativeFontResourceKey, nfr,
ReleaseNativeFontResource);
}
if (err != CAIRO_STATUS_SUCCESS) {
gfxWarning() << "Failed binding NativeFontResource to Cairo font face";
if (varFace && cleanupFace) {
Factory::ReleaseFTFace(varFace);
}
nfr->Release();
cairo_font_face_destroy(font);
FcPatternDestroy(pattern);
return nullptr;
}
}
cairo_matrix_t sizeMatrix;
cairo_matrix_init(&sizeMatrix, aSize, 0, 0, aSize, 0, 0);
cairo_matrix_t identityMatrix;
cairo_matrix_init_identity(&identityMatrix);
cairo_font_options_t* fontOptions = cairo_font_options_create();
instanceData.SetupFontOptions(fontOptions);
cairo_scaled_font_t* cairoScaledFont =
cairo_scaled_font_create(font, &sizeMatrix, &identityMatrix, fontOptions);
cairo_font_options_destroy(fontOptions);
cairo_font_face_destroy(font);
if (cairo_scaled_font_status(cairoScaledFont) != CAIRO_STATUS_SUCCESS) {
gfxWarning() << "Failed creating Cairo scaled font for font face";
FcPatternDestroy(pattern);
return nullptr;
}
RefPtr<ScaledFontFontconfig> scaledFont =
new ScaledFontFontconfig(cairoScaledFont, pattern, this, aSize);
cairo_scaled_font_destroy(cairoScaledFont);
FcPatternDestroy(pattern);
// Only apply variations if we have an explicitly cloned face. Otherwise,
// if the pattern holds the pathname, Cairo will handle setting of variations.
if (varFace) {
ApplyVariationsToFace(aVariations, aNumVariations, varFace);
}
return scaledFont.forget();
}
already_AddRefed<ScaledFont> UnscaledFontFontconfig::CreateScaledFontFromWRFont(
Float aGlyphSize, const wr::FontInstanceOptions* aOptions,
const wr::FontInstancePlatformOptions* aPlatformOptions,
const FontVariation* aVariations, uint32_t aNumVariations) {
ScaledFontFontconfig::InstanceData instanceData(aOptions, aPlatformOptions);
return CreateScaledFont(aGlyphSize, reinterpret_cast<uint8_t*>(&instanceData),
sizeof(instanceData), aVariations, aNumVariations);
}
bool ScaledFontFontconfig::HasVariationSettings() {
// Check if the FT face has been cloned.
FT_Face face = nullptr;
return FcPatternGetFTFace(mPattern, FC_FT_FACE, 0, &face) == FcResultMatch &&
face && face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS &&
face != static_cast<UnscaledFontFontconfig*>(mUnscaledFont.get())
->GetFace();
}
already_AddRefed<UnscaledFont> UnscaledFontFontconfig::CreateFromFontDescriptor(
const uint8_t* aData, uint32_t aDataLength, uint32_t aIndex) {
if (aDataLength == 0) {
gfxWarning() << "Fontconfig font descriptor is truncated.";
return nullptr;
}
const char* path = reinterpret_cast<const char*>(aData);
RefPtr<UnscaledFont> unscaledFont =
new UnscaledFontFontconfig(std::string(path, aDataLength), aIndex);
return unscaledFont.forget();
}
} // namespace gfx
} // namespace mozilla
Reference in New Issue View Git Blame Copy Permalink