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Code Issues

Fix: Scale default FreeType font size selection by UI zoom level.

pull/6829/head
Michael Lutz 2018-06-17 01:37:38 +02:00
parent 4099506093
commit ae467ffc8a
1 changed files with 16 additions and 4 deletions
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20
src/fontcache.cpp
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@ -209,6 +209,7 @@ bool SpriteFontCache::GetDrawGlyphShadow()
class FreeTypeFontCache : public FontCache {
private:
FT_Face face; ///< The font face associated with this font.
int req_size; ///< Requested font size.
typedef SmallMap<uint32, SmallPair<size_t, const void*> > FontTable; ///< Table with font table cache
FontTable font_tables; ///< Cached font tables.
@ -237,6 +238,7 @@ private:
GlyphEntry *GetGlyphPtr(GlyphID key);
void SetGlyphPtr(GlyphID key, const GlyphEntry *glyph, bool duplicate = false);
void SetFontSize(FontSize fs, FT_Face face, int pixels);
public:
FreeTypeFontCache(FontSize fs, FT_Face face, int pixels);
@ -267,20 +269,26 @@ static const byte SHADOW_COLOUR = 2;
* @param face The font that has to be loaded.
* @param pixels The number of pixels this font should be high.
*/
FreeTypeFontCache::FreeTypeFontCache(FontSize fs, FT_Face face, int pixels) : FontCache(fs), face(face), glyph_to_sprite(NULL)
FreeTypeFontCache::FreeTypeFontCache(FontSize fs, FT_Face face, int pixels) : FontCache(fs), face(face), req_size(pixels), glyph_to_sprite(NULL)
{
assert(face != NULL);
this->SetFontSize(fs, face, pixels);
}
void FreeTypeFontCache::SetFontSize(FontSize fs, FT_Face face, int pixels)
{
if (pixels == 0) {
/* Try to determine a good height based on the minimal height recommended by the font. */
pixels = _default_font_height[this->fs];
int scaled_height = ScaleGUITrad(_default_font_height[this->fs]);
pixels = scaled_height;
TT_Header *head = (TT_Header *)FT_Get_Sfnt_Table(this->face, ft_sfnt_head);
if (head != NULL) {
/* Font height is minimum height plus the difference between the default
* height for this font size and the small size. */
int diff = _default_font_height[this->fs] - _default_font_height[FS_SMALL];
pixels = Clamp(min(head->Lowest_Rec_PPEM, 20) + diff, _default_font_height[this->fs], MAX_FONT_SIZE);
int diff = scaled_height - ScaleGUITrad(_default_font_height[FS_SMALL]);
pixels = Clamp(min(head->Lowest_Rec_PPEM, 20) + diff, scaled_height, MAX_FONT_SIZE);
}
}
@ -395,6 +403,7 @@ found_face:
FreeTypeFontCache::~FreeTypeFontCache()
{
FT_Done_Face(this->face);
this->face = NULL;
this->ClearFontCache();
for (FontTable::iterator iter = this->font_tables.Begin(); iter != this->font_tables.End(); iter++) {
@ -424,6 +433,9 @@ void FreeTypeFontCache::ClearFontCache()
this->glyph_to_sprite = NULL;
Layouter::ResetFontCache(this->fs);
/* GUI scaling might have changed, determine font size anew if it was automatically selected. */
if (this->face != NULL && this->req_size == 0) this->SetFontSize(this->fs, this->face, this->req_size);
}
FreeTypeFontCache::GlyphEntry *FreeTypeFontCache::GetGlyphPtr(GlyphID key)