Changeset 794e368 in mainline for uspace/lib/draw/font/bitmap_backend.c

Timestamp:

2014-08-28T13:55:26Z (10 years ago)

Author:

Martin Sucha <sucha14@…>

Branches:

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

Children:

c6c39d4f

Parents:

a9763c6

Message:

Fix scaling of bitmap fonts.

File:

• uspace/lib/draw/font/bitmap_backend.c (modified) (4 diffs)

uspace/lib/draw/font/bitmap_backend.c

@@ -136 +136 @@
         surface_get_resolution(raw_surface, &w, &h);
         
-        if (h == data->points) {
+        if (!data->scale) {
                 *result = raw_surface;
                 return EOK;
@@ -147 +147 @@
         transform_t transform;
         transform_identity(&transform);
-        double ratio = ((double) data->points) / ((double) h);
-        transform_scale(&transform, ratio, ratio);
+        transform_translate(&transform, 0.5, 0.5);
+        transform_scale(&transform, data->scale_ratio, data->scale_ratio);
         source_set_transform(&source, transform);
 
-        double width = w;
-        double height = h;
-        transform_apply_linear(&transform, &width, &height);
-        surface_t *scaled_surface =
-            surface_create((sysarg_t) (width + 0.5), (sysarg_t) (height + 0.5), NULL, 0);
+        surface_coord_t scaled_width = (data->scale_ratio * ((double) w) + 0.5);
+        surface_coord_t scaled_height = (data->scale_ratio * ((double) h) + 0.5);
+
+        surface_t *scaled_surface = surface_create(scaled_width, scaled_height,
+            NULL, 0);
         if (!scaled_surface) {
                 surface_destroy(raw_surface);
@@ -164 +164 @@
         drawctx_init(&context, scaled_surface);
         drawctx_set_source(&context, &source);
-        drawctx_transfer(&context, 0, 0,
-            (sysarg_t) (width + 0.5), (sysarg_t) (height + 0.5));
+        drawctx_transfer(&context, 0, 0, scaled_width, scaled_height);
 
         surface_destroy(raw_surface);
@@ -249 +248 @@
                 data->scale = true;
                 data->scale_ratio = ((double) points) / ((double) line_height);
+                line_height = (data->scale_ratio * ((double) line_height));
                 data->font_metrics.ascender = (metric_t)
                     (data->scale_ratio * data->font_metrics.ascender + 0.5);
-                data->font_metrics.descender = (metric_t)
-                    (data->scale_ratio * data->font_metrics.descender - 0.5);
+                data->font_metrics.descender =
+                    line_height - data->font_metrics.ascender;
                 data->font_metrics.leading = (metric_t)
                     (data->scale_ratio * data->font_metrics.leading + 0.5);