зеркало из https://github.com/mozilla/moz-skia.git
87 строки
2.8 KiB
C++
87 строки
2.8 KiB
C++
#ifndef SkGLTextCache_DEFINED
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#define SkGLTextCache_DEFINED
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#include "SkGL.h"
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class SkGlyph;
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class SkGLTextCache {
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public:
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SkGLTextCache();
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~SkGLTextCache();
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/** Delete all of the strikes in the cache. Pass true if the texture IDs are
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still valid, in which case glDeleteTextures will be called. Pass false
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if they are invalid (e.g. the gl-context has changed), in which case
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they will just be abandoned.
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*/
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void deleteAllStrikes(bool texturesAreValid);
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class Strike {
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public:
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int width() const { return fStrikeWidth; }
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int height() const { return fStrikeHeight; }
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GLuint texture() const { return fTexName; }
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int widthShift() const { return fStrikeWidthShift; }
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int heightShift() const { return fStrikeHeightShift; }
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// call this to force us to ignore the texture name in our destructor
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// only call it right before our destructor
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void abandonTexture() { fTexName = 0; }
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private:
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// if next is non-null, its height must match our height
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Strike(Strike* next, int width, int height);
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~Strike();
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Strike* findGlyph(const SkGlyph&, int* offset);
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Strike* addGlyphAndBind(const SkGlyph&, const uint8_t*, int* offset);
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enum {
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kMinStrikeWidth = 1024,
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kMaxGlyphCount = 256
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};
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Strike* fNext;
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GLuint fTexName;
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uint32_t fGlyphIDArray[kMaxGlyphCount]; // stores glyphIDs
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uint16_t fGlyphOffsetX[kMaxGlyphCount]; // stores x-offsets
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uint16_t fGlyphCount;
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uint16_t fNextFreeOffsetX;
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uint16_t fStrikeWidth;
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uint16_t fStrikeHeight;
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uint8_t fStrikeWidthShift; // pow2(fStrikeWidth)
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uint8_t fStrikeHeightShift; // pow2(fStrikeHeight)
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friend class SkGLTextCache;
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};
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/** If found, returns the exact strike containing it (there may be more than
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one with a given height), and sets offset to the offset for that glyph
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(if not null). Does NOT bind the texture.
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If not found, returns null and ignores offset param.
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*/
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Strike* findGlyph(const SkGlyph&, int* offset);
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/** Adds the specified glyph to this list of strikes, returning the new
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head of the list. If offset is not null, it is set to the offset
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for this glyph within the strike. The associated texture is bound
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to the gl context.
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*/
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Strike* addGlyphAndBind(const SkGlyph&, const uint8_t image[], int* offset);
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private:
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enum {
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// greater than this we won't cache
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kMaxGlyphHeightShift = 9,
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kMaxGlyphHeight = 1 << kMaxGlyphHeightShift,
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kMaxStrikeListCount = kMaxGlyphHeightShift + 1
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};
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// heads of the N families, one for each pow2 height
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Strike* fStrikeList[kMaxStrikeListCount];
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};
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#endif
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