7dd3bbda13
Even though glyph masks are stored without any baked-in color, the blending weights they represent are preblended so as to be gamma-aware on macOS and Windows. That means the color requested for the glyph alters the mask itself. It is not sufficient to store a single mask that can be used for any color, rather, there must be different masks stored for each potential preblend ramp that is generated by Skia. Skia uses a quantization scheme where only the high bits of the color are used to generate the preblend ramp so as to minimize the number of tables generated, so we do our best to mimic that scheme and avoid generating an excessive number of masks. This allows reuse of masks for some subset of colors, albeit not every color. However, coaxing Skia into generating preblended masks without baking in the final rasterized color requires some subversive use of SkShader to alter the queried luminance color without changing the actual color of an SkPaint. An alternative invasive approach would be to modify Skia to support this via a flag in SkPaint directly, but that would require patching Skia directly, which might be necessary in the future should SkShader become deprecated. Differential Revision: https://phabricator.services.mozilla.com/D219242
101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_GFX_SCALEDFONTMAC_H_
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#define MOZILLA_GFX_SCALEDFONTMAC_H_
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#ifdef MOZ_WIDGET_COCOA
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# include <ApplicationServices/ApplicationServices.h>
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#else
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# include <CoreGraphics/CoreGraphics.h>
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# include <CoreText/CoreText.h>
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#endif
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#include "2D.h"
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#include "ScaledFontBase.h"
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namespace mozilla {
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namespace gfx {
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// Utility to create a CTFont from a CGFont, copying any variations that were
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// set on the original CGFont, and applying additional attributes from aDesc
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// (which may be NULL).
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// Exposed here because it is also used by gfxMacFont and gfxCoreTextShaper.
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CTFontRef CreateCTFontFromCGFontWithVariations(
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CGFontRef aCGFont, CGFloat aSize, bool aInstalledFont,
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CTFontDescriptorRef aFontDesc = nullptr);
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class UnscaledFontMac;
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class ScaledFontMac : public ScaledFontBase {
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public:
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MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(ScaledFontMac, override)
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ScaledFontMac(CGFontRef aFont, const RefPtr<UnscaledFont>& aUnscaledFont,
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Float aSize, bool aOwnsFont = false,
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bool aUseFontSmoothing = true, bool aApplySyntheticBold = false,
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bool aHasColorGlyphs = false);
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ScaledFontMac(CTFontRef aFont, const RefPtr<UnscaledFont>& aUnscaledFont,
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bool aUseFontSmoothing = true, bool aApplySyntheticBold = false,
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bool aHasColorGlyphs = false);
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~ScaledFontMac();
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FontType GetType() const override { return FontType::MAC; }
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SkTypeface* CreateSkTypeface() override;
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void SetupSkFontDrawOptions(SkFont& aFont) override;
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already_AddRefed<Path> GetPathForGlyphs(const GlyphBuffer& aBuffer,
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const DrawTarget* aTarget) override;
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bool GetFontInstanceData(FontInstanceDataOutput aCb, void* aBaton) override;
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bool GetWRFontInstanceOptions(
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Maybe<wr::FontInstanceOptions>* aOutOptions,
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Maybe<wr::FontInstancePlatformOptions>* aOutPlatformOptions,
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std::vector<FontVariation>* aOutVariations) override;
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bool CanSerialize() override { return true; }
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bool MayUseBitmaps() override { return mHasColorGlyphs; }
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bool UseSubpixelPosition() const override { return true; }
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bool UseFontSmoothing() const { return mUseFontSmoothing; }
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cairo_font_face_t* CreateCairoFontFace(
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cairo_font_options_t* aFontOptions) override;
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private:
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friend class DrawTargetSkia;
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friend class UnscaledFontMac;
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CGFontRef mFont;
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CTFontRef
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mCTFont; // only created if CTFontDrawGlyphs is available, otherwise null
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bool mUseFontSmoothing;
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bool mApplySyntheticBold;
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bool mHasColorGlyphs;
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struct InstanceData {
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explicit InstanceData(ScaledFontMac* aScaledFont)
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: mUseFontSmoothing(aScaledFont->mUseFontSmoothing),
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mApplySyntheticBold(aScaledFont->mApplySyntheticBold),
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mHasColorGlyphs(aScaledFont->mHasColorGlyphs) {}
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InstanceData(const wr::FontInstanceOptions* aOptions,
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const wr::FontInstancePlatformOptions* aPlatformOptions);
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bool mUseFontSmoothing;
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bool mApplySyntheticBold;
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bool mHasColorGlyphs;
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};
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};
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} // namespace gfx
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} // namespace mozilla
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#endif /* MOZILLA_GFX_SCALEDFONTMAC_H_ */
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