Changeset 5713e5f in mainline for uspace/lib/draw/font.h

Timestamp:

2014-09-01T19:17:55Z (10 years ago)

Author:

Martin Sucha <sucha14@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

21365c0

Parents:

a4666a9 (diff), 00ddb40 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge improvements in the graphics stack.

• Support for drawing proportional fonts (although no actual font file included yet)
• Implementation of bilinear filter

File:

• uspace/lib/draw/font.h (modified) (2 diffs)

uspace/lib/draw/font.h

@@ -1 +1 @@
 /*
  * Copyright (c) 2012 Petr Koupy
+ * Copyright (c) 2014 Martin Sucha
  * All rights reserved.
  *
@@ -45 +46 @@
 typedef struct drawctx drawctx_t;
 
-typedef enum {
-        FONT_DECODER_EMBEDDED
-} font_decoder_type_t;
+typedef int metric_t;
 
 typedef struct {
-        void (*init)(char *, uint16_t *, void **);
-        uint16_t (*resolve)(const wchar_t, void *);
-        surface_t *(*render)(uint16_t, uint16_t);
+        /* Horizontal distance between origin and left side of the glyph */ 
+        metric_t left_side_bearing;
+        
+        /* Width of the actual glyph drawn */
+        metric_t width;
+        
+        /* Horizontal distance between right side of the glyph and origin
+           of the next glyph */
+        metric_t right_side_bearing;
+        
+        /* Vertical distance between baseline and top of the glyph
+           (positive to top) */
+        metric_t ascender;
+        
+        /* Height of the actual glyph drawn */
+        metric_t height;
+} glyph_metrics_t;
+
+static inline metric_t glyph_metrics_get_descender(glyph_metrics_t *gm)
+{
+        return gm->height - gm->ascender;
+}
+
+static inline metric_t glyph_metrics_get_advancement(glyph_metrics_t *gm)
+{
+        return gm->left_side_bearing + gm->width + gm->right_side_bearing;
+}
+
+typedef struct {
+        /* Distance between top of the line and baseline */
+        metric_t ascender;
+        
+        /* Distance between baseline and bottom of the line */
+        metric_t descender;
+        
+        /* Distance between bottom of the line and top of the next line */
+        metric_t leading;
+} font_metrics_t;
+
+typedef uint32_t glyph_id_t;
+
+typedef struct {
+        int (*get_font_metrics)(void *, font_metrics_t *);
+        int (*resolve_glyph)(void *, wchar_t, glyph_id_t *);
+        int (*get_glyph_metrics)(void *, glyph_id_t, glyph_metrics_t *);
+        int (*render_glyph)(void *, drawctx_t *, source_t *, sysarg_t,
+            sysarg_t, glyph_id_t);
         void (*release)(void *);
-} font_decoder_t;
+} font_backend_t;
 
-typedef struct font {
-        uint16_t points;
-        uint16_t glyph_count;
-        surface_t **glyphs;
-        font_decoder_t *decoder;
-        void *decoder_data;
+typedef struct {
+        font_backend_t *backend;
+        void *backend_data;
 } font_t;
 
-extern void font_init(font_t *, font_decoder_type_t, char *, uint16_t);
+extern font_t *font_create(font_backend_t *, void *);
+extern int font_get_metrics(font_t *, font_metrics_t *);
+extern int font_resolve_glyph(font_t *, wchar_t, glyph_id_t *);
+extern int font_get_glyph_metrics(font_t *, glyph_id_t, glyph_metrics_t *);
+extern int font_render_glyph(font_t *, drawctx_t *, source_t *,
+    sysarg_t, sysarg_t, glyph_id_t);
 extern void font_release(font_t *);
 
-extern void font_get_box(font_t *, char *, sysarg_t *, sysarg_t *);
-extern void font_draw_text(font_t *, drawctx_t *, source_t *, const char *,
+extern int font_get_box(font_t *, char *, sysarg_t *, sysarg_t *);
+extern int font_draw_text(font_t *, drawctx_t *, source_t *, const char *,
     sysarg_t, sysarg_t);