From 6b422afbb34fa17774a847a51d5bb36aa10e2d4b Mon Sep 17 00:00:00 2001
From: Luo Jinghua <sunmoon1997@gmail.com>
Date: Wed, 8 Jun 2011 11:22:14 +0800
Subject: opengl: only use the alpha bits for subpixels enabled fonts

---
 src/sdl-freetype-opengl.c | 44 +++++++++++++++++++++++++++++---------------
 1 file changed, 29 insertions(+), 15 deletions(-)

diff --git a/src/sdl-freetype-opengl.c b/src/sdl-freetype-opengl.c
index b38d4e8..b29e8a3 100644
--- a/src/sdl-freetype-opengl.c
+++ b/src/sdl-freetype-opengl.c
@@ -133,13 +133,12 @@ sdl_freetype_opengl_glyph_user_data_init (sdl_freetype_font_t * font,
             break;
         case FT_PIXEL_MODE_LCD:
         case FT_PIXEL_MODE_LCD_V:
-            opengl_render->subpixel = SDL_FREETYPE_TRUE;
-            data = calloc (opengl_render->width * opengl_render->height * 4, 1);
+            data = calloc (opengl_render->width * opengl_render->height, 1);
             if (!data)
                 return SDL_FREETYPE_ERR_OUT_OF_MEMORY;
-            glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA,
+            glTexImage2D (GL_TEXTURE_2D, 0, GL_ALPHA,
                           opengl_render->width, opengl_render->height, 0,
-                          GL_RGBA, GL_UNSIGNED_BYTE, data);
+                          GL_ALPHA, GL_UNSIGNED_BYTE, data);
             free (data);
             break;
         default:
@@ -171,14 +170,29 @@ sdl_freetype_opengl_glyph_user_data_init (sdl_freetype_font_t * font,
                     dst[x] = 0xff;
             }
         }
+    } else if (bitmap->pixel_mode == FT_PIXEL_MODE_LCD ||
+	       bitmap->pixel_mode == FT_PIXEL_MODE_LCD_V) {
+        unsigned char * src, * dst;
+        int h;
+
+        width = pitch = (bitmap->width + 3) & ~3;
+        data = calloc (pitch * info->bitmap.rows, 1);
+        if (!data)
+            return SDL_FREETYPE_ERR_OUT_OF_MEMORY;
+
+        src = bitmap->buffer;
+        dst = data;
+        for (h = bitmap->rows; h > 0; h--, src += bitmap->pitch, dst += pitch) {
+            int  x;
+	    unsigned int *s = (unsigned int*)src;
+
+            for (x = 0; x < bitmap->width; x++)
+		dst[x] = s[x] >> 24;
+        }
     } else {
         data = NULL;
         pitch = bitmap->pitch;
-        if (bitmap->pixel_mode == FT_PIXEL_MODE_LCD ||
-            bitmap->pixel_mode == FT_PIXEL_MODE_LCD_V)
-            width = bitmap->width;
-        else
-            width = pitch;
+	width = (bitmap->width + 3) & ~3;
     }
     height = (bitmap->rows + 3) & ~3;
 
@@ -223,8 +237,8 @@ sdl_freetype_opengl_glyph_user_data_init (sdl_freetype_font_t * font,
     case FT_PIXEL_MODE_LCD:
     case FT_PIXEL_MODE_LCD_V:
         glTexSubImage2D (GL_TEXTURE_2D, 0,
-                         area->x, area->y, bitmap->width, bitmap->rows,
-                         GL_RGBA, GL_UNSIGNED_BYTE, bitmap->buffer);
+                         area->x, area->y, pitch, bitmap->rows,
+                         GL_ALPHA, GL_UNSIGNED_BYTE, data);
         break;
     }
 
@@ -233,8 +247,8 @@ sdl_freetype_opengl_glyph_user_data_init (sdl_freetype_font_t * font,
     if (data)
         free (data);
 
-    user_data->uv[0].x = (float)area->x ;
-    user_data->uv[0].y = (float)area->y ;
+    user_data->uv[0].x = (float)area->x;
+    user_data->uv[0].y = (float)area->y;
     user_data->uv[1].x = (float)(area->x + bitmap->width);
     user_data->uv[1].y = (float)(area->y + bitmap->rows);
     info->data = user_data;
@@ -246,7 +260,7 @@ sdl_freetype_opengl_glyph_user_data_fini (sdl_freetype_font_t * font,
                                           sdl_freetype_glyph_render_t * render,
                                           void * data)
 {
-    sdl_freetype_opengl_render_t * opengl_render = 
+    sdl_freetype_opengl_render_t * opengl_render =
         (sdl_freetype_opengl_render_t *) render;
 
     if (!data)
@@ -272,7 +286,7 @@ sdl_freetype_opengl_glyphs_render (sdl_freetype_font_t * font,
                                    const sdl_freetype_glyph_t * glyphs,
                                    int num_glyphs)
 {
-    sdl_freetype_opengl_render_t * render = 
+    sdl_freetype_opengl_render_t * render =
         (sdl_freetype_opengl_render_t *) sdl_freetype_font_get_render (font);
     sdl_freetype_opengl_user_data_t * user_data;
     sdl_freetype_opengl_glyph_info_t * cached, stack_cached[LOCAL_BUF];
-- 
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