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Add a simple cache mechanism to ft::Face (at the moment without cache)

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This commit is contained in:
David Capello 2016-03-10 17:10:17 -03:00
parent dfa6bcd16b
commit d020a19bd2
1 changed files with 40 additions and 15 deletions
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55
src/ft/face.h
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@ -14,12 +14,13 @@
namespace ft {
class Face {
template<typename Cache>
class FaceT {
public:
Face(FT_Face face = nullptr) : m_face(face) {
FaceT(FT_Face face = nullptr) : m_face(face) {
}
~Face() {
~FaceT() {
if (m_face)
FT_Done_Face(m_face);
}
@ -37,10 +38,12 @@ namespace ft {
void setAntialias(bool antialias) {
m_antialias = antialias;
m_cache.invalidate();
}
void setSize(int size) {
FT_Set_Pixel_Sizes(m_face, size, size);
m_cache.invalidate();
}
template<typename Iterator,
@ -51,7 +54,7 @@ namespace ft {
FT_UInt prev_glyph = 0;
int x = 0;
for (; first != end; ++first) {
FT_UInt glyph_index = FT_Get_Char_Index(m_face, *first);
FT_UInt glyph_index = m_cache.getGlyphIndex(m_face, *first);
if (use_kerning && prev_glyph && glyph_index) {
FT_Vector kerning;
@ -60,16 +63,10 @@ namespace ft {
x += kerning.x >> 6;
}
FT_Error err = FT_Load_Glyph(
m_face, glyph_index,
FT_LOAD_RENDER |
FT_LOAD_NO_BITMAP |
(m_antialias ? FT_LOAD_TARGET_NORMAL:
FT_LOAD_TARGET_MONO));
if (!err) {
callback(m_face->glyph, x);
x += m_face->glyph->advance.x >> 6;
FT_GlyphSlot glyph = m_cache.loadGlyph(m_face, glyph_index, m_antialias);
if (glyph) {
callback(glyph, x);
x += glyph->advance.x >> 6;
}
prev_glyph = glyph_index;
@ -95,10 +92,38 @@ namespace ft {
private:
FT_Face m_face;
bool m_antialias;
Cache m_cache;
DISABLE_COPYING(Face);
DISABLE_COPYING(FaceT);
};
class NoCache {
public:
void invalidate() {
// Do nothing
}
FT_UInt getGlyphIndex(FT_Face face, int charCode) {
return FT_Get_Char_Index(face, charCode);
}
FT_GlyphSlot loadGlyph(FT_Face face, FT_UInt glyphIndex, bool antialias) {
FT_Error err = FT_Load_Glyph(
face, glyphIndex,
FT_LOAD_RENDER |
FT_LOAD_NO_BITMAP |
(antialias ? FT_LOAD_TARGET_NORMAL:
FT_LOAD_TARGET_MONO));
if (!err)
return face->glyph;
else
return nullptr;
}
};
typedef FaceT<NoCache> Face;
} // namespace ft
#endif