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