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

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.c (modified) (3 diffs)

uspace/lib/draw/font.c

@@ -1 +1 @@
 /*
  * Copyright (c) 2012 Petr Koupy
+ * Copyright (c) 2014 Martin Sucha
  * All rights reserved.
  *
@@ -34 +35 @@
  */
 
-#include <assert.h>
 #include <malloc.h>
+#include <errno.h>
+#include <str.h>
 
 #include "font.h"
@@ -41 +43 @@
 #include "drawctx.h"
 
-void font_init(font_t *font, font_decoder_type_t decoder, char *path, uint16_t points)
+font_t *font_create(font_backend_t *backend, void *backend_data)
 {
-        font->points = points;
-
-        switch (decoder) {
-        case FONT_DECODER_EMBEDDED:
-                font->decoder = &fd_embedded;
-                break;
-        default:
-                font->decoder = NULL;
-                break;
-        }
-
-        if (font->decoder) {
-                font->decoder->init(path, &font->glyph_count, &font->decoder_data);
-
-                if (font->glyph_count > 0) {
-                        font->glyphs = (surface_t **) malloc(sizeof(surface_t *) * font->glyph_count);
-                } else {
-                        font->glyphs = NULL;
-                }
-
-                if (font->glyphs) {
-                        for (size_t i = 0; i < font->glyph_count; ++i) {
-                                font->glyphs[i] = NULL;
-                        }
-                } else {
-                        font->glyph_count = 0;
-                }
-        } else {
-                font->glyph_count = 0;
-                font->glyphs = NULL;
-                font->decoder_data = NULL;
-        }
+        font_t *font = malloc(sizeof(font_t));
+        if (font == NULL)
+                return NULL;
+        
+        font->backend = backend;
+        font->backend_data = backend_data;
+        
+        return font;
 }
 
 void font_release(font_t *font)
 {
-        if (font->glyphs) {
-                for (size_t i = 0; i < font->glyph_count; ++i) {
-                        if (font->glyphs[i]) {
-                                surface_destroy(font->glyphs[i]);
+        font->backend->release(font->backend_data);
+}
+
+int font_get_metrics(font_t *font, font_metrics_t *metrics) {
+        return font->backend->get_font_metrics(font->backend_data, metrics);
+}
+
+int font_resolve_glyph(font_t *font, wchar_t c, glyph_id_t *glyph_id) {
+        return font->backend->resolve_glyph(font->backend_data, c, glyph_id);
+}
+
+int font_get_glyph_metrics(font_t *font, glyph_id_t glyph_id,
+    glyph_metrics_t *glyph_metrics)
+{
+        return font->backend->get_glyph_metrics(font->backend_data,
+            glyph_id, glyph_metrics);
+}
+
+int font_render_glyph(font_t *font, drawctx_t *context, source_t *source,
+    sysarg_t x, sysarg_t y, glyph_id_t glyph_id)
+{
+        return font->backend->render_glyph(font->backend_data, context, source,
+            x, y, glyph_id);
+}
+
+/* TODO this is bad interface */
+int font_get_box(font_t *font, char *text, sysarg_t *width, sysarg_t *height)
+{
+        font_metrics_t fm;
+        int rc = font_get_metrics(font, &fm);
+        if (rc != EOK)
+                return rc;
+
+        native_t x = 0;
+
+        size_t off = 0;
+        while (true) {
+                wchar_t c = str_decode(text, &off, STR_NO_LIMIT);
+                if (c == 0)
+                        break;
+                
+                glyph_id_t glyph_id;
+                rc = font_resolve_glyph(font, c, &glyph_id);
+                if (rc != EOK) {
+                        int rc2 = font_resolve_glyph(font, U_SPECIAL, &glyph_id);
+                        if (rc2 != EOK) {
+                                return rc;
                         }
                 }
-                free(font->glyphs);
+                
+                glyph_metrics_t glyph_metrics;
+                rc = font_get_glyph_metrics(font, glyph_id, &glyph_metrics);
+                if (rc != EOK)
+                        return rc;
+                
+                x += glyph_metrics_get_advancement(&glyph_metrics);
         }
-        
-        if (font->decoder) {
-                font->decoder->release(font->decoder_data);
-        }
+
+        *width = x;
+        *height = fm.ascender + fm.descender;
+        return EOK;
 }
 
-void font_get_box(font_t *font, char *text, sysarg_t *width, sysarg_t *height)
+/* TODO this is bad interface */
+int font_draw_text(font_t *font, drawctx_t *context, source_t *source,
+    const char *text, sysarg_t sx, sysarg_t sy)
 {
-        assert(width);
-        assert(height);
-
-        (*width) = 0;
-        (*height) = 0;
-
-        if (!text) {
-                return;
-        }
-
-        while (*text) {
-                uint16_t glyph_idx = font->decoder->resolve(*text, font->decoder_data);
-                if (glyph_idx < font->glyph_count) {
-                        if (!font->glyphs[glyph_idx]) {
-                                font->glyphs[glyph_idx] =
-                                    font->decoder->render(glyph_idx, font->points);
-                        }
-
-                        surface_t *glyph = font->glyphs[glyph_idx];
-                        if (glyph) {
-                                sysarg_t w;
-                                sysarg_t h;
-                                surface_get_resolution(glyph, &w, &h);
-                                (*width) += w;
-                                (*height) = (*height) < h ? h : (*height);
-                        }
-                }
-                ++text;
-        }
-}
-
-void font_draw_text(font_t *font, drawctx_t *context, source_t *source,
-    const char *text, sysarg_t x, sysarg_t y)
-{
-        assert(context);
-        assert(source);
-
         drawctx_save(context);
         drawctx_set_compose(context, compose_over);
 
-        while (*text) {
-                uint16_t glyph_idx = font->decoder->resolve(*text, font->decoder_data);
-                if (glyph_idx < font->glyph_count) {
-                        if (!font->glyphs[glyph_idx]) {
-                                font->glyphs[glyph_idx] =
-                                    font->decoder->render(glyph_idx, font->points);
-                        }
+        font_metrics_t fm;
+        int rc = font_get_metrics(font, &fm);
+        if (rc != EOK)
+                return rc;
 
-                        surface_t *glyph = font->glyphs[glyph_idx];
-                        if (glyph) {
-                                sysarg_t w;
-                                sysarg_t h;
-                                surface_get_resolution(glyph, &w, &h);
+        native_t baseline = sy + fm.ascender;
+        native_t x = sx;
 
-                                transform_t transform;
-                                transform_identity(&transform);
-                                transform_translate(&transform, x, y);
-                                source_set_transform(source, transform);
-                                source_set_mask(source, glyph, false);
-                                drawctx_transfer(context, x, y, w, h);
-
-                                x += w;
+        size_t off = 0;
+        while (true) {
+                wchar_t c = str_decode(text, &off, STR_NO_LIMIT);
+                if (c == 0)
+                        break;
+                
+                glyph_id_t glyph_id;
+                rc = font_resolve_glyph(font, c, &glyph_id);
+                if (rc != EOK) {
+                        int rc2 = font_resolve_glyph(font, U_SPECIAL, &glyph_id);
+                        if (rc2 != EOK) {
+                                return rc;
                         }
                 }
-                ++text;
+                
+                glyph_metrics_t glyph_metrics;
+                rc = font_get_glyph_metrics(font, glyph_id, &glyph_metrics);
+                if (rc != EOK)
+                        return rc;
+
+                rc = font_render_glyph(font, context, source, x, baseline,
+                    glyph_id);
+                if (rc != EOK)
+                        return rc;
+
+                x += glyph_metrics_get_advancement(&glyph_metrics);
+
         }
 
         drawctx_restore(context);
         source_set_mask(source, NULL, false);
+
+        return EOK;
 }