recovery: change font for menus to be an image

Instead of representing the font used for menus and log messages in
the recovery binary, load it from a resource PNG image.  This allows
different devices to substitute their own font images.

Change-Id: Ib36b86db3d01298aa7ae2b62a26ca29e6ef18014

3 files changed, 27 insertions, 246 deletions

diff --git a/minui/font_10x18.h b/minui/font_10x18.h
deleted file mode 100644
index 7f96465..0000000
--- a/minui/font_10x18.h
+++ /dev/null
@@ -1,214 +0,0 @@
-struct {
-  unsigned width;
-  unsigned height;
-  unsigned cwidth;
-  unsigned cheight;
-  unsigned char rundata[];
-} font = {
-  .width = 960,
-  .height = 18,
-  .cwidth = 10,
-  .cheight = 18,
-  .rundata = {
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-0x84,0x3f,
-0x00,
-  }
-};
diff --git a/minui/graphics.c b/minui/graphics.c
index 747b2db..ba68a95 100644
--- a/minui/graphics.c
+++ b/minui/graphics.c
@@ -30,7 +30,6 @@
 
 #include <pixelflinger/pixelflinger.h>
 
-#include "font_10x18.h"
 #include "minui.h"
 
 #if defined(RECOVERY_BGRA)
@@ -47,7 +46,7 @@
 #define NUM_BUFFERS 2
 
 typedef struct {
-    GGLSurface texture;
+    GGLSurface* texture;
     unsigned cwidth;
     unsigned cheight;
     unsigned ascent;
@@ -230,12 +229,14 @@ int gr_text(int x, int y, const char *s)
     GRFont *font = gr_font;
     unsigned off;
 
+    if (!font->texture) return x;
+
     x += overscan_offset_x;
     y += overscan_offset_y;
 
     y -= font->ascent;
 
-    gl->bindTexture(gl, &font->texture);
+    gl->bindTexture(gl, font->texture);
     gl->texEnvi(gl, GGL_TEXTURE_ENV, GGL_TEXTURE_ENV_MODE, GGL_REPLACE);
     gl->texGeni(gl, GGL_S, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
     gl->texGeni(gl, GGL_T, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
@@ -322,31 +323,21 @@ unsigned int gr_get_height(gr_surface surface) {
 
 static void gr_init_font(void)
 {
-    GGLSurface *ftex;
-    unsigned char *bits, *rle;
-    unsigned char *in, data;
-
     gr_font = calloc(sizeof(*gr_font), 1);
-    ftex = &gr_font->texture;
-
-    bits = malloc(font.width * font.height);
 
-    ftex->version = sizeof(*ftex);
-    ftex->width = font.width;
-    ftex->height = font.height;
-    ftex->stride = font.width;
-    ftex->data = (void*) bits;
-    ftex->format = GGL_PIXEL_FORMAT_A_8;
-
-    in = font.rundata;
-    while((data = *in++)) {
-        memset(bits, (data & 0x80) ? 255 : 0, data & 0x7f);
-        bits += (data & 0x7f);
+    int res = res_create_surface("font", (void**)&(gr_font->texture));
+    if (res != 0) {
+        printf("failed to read font: res=%d\n", res);
+        gr_font->texture = NULL;
+        return;
     }
 
-    gr_font->cwidth = font.cwidth;
-    gr_font->cheight = font.cheight;
-    gr_font->ascent = font.cheight - 2;
+    // interpret the grayscale as alpha
+    gr_font->texture->format = GGL_PIXEL_FORMAT_A_8;
+
+    gr_font->cwidth = gr_font->texture->width / 96;
+    gr_font->cheight = gr_font->texture->height;
+    gr_font->ascent = gr_font->cheight - 2;
 }
 
 int gr_init(void)
diff --git a/minui/resources.c b/minui/resources.c
index 065f431..72f39fb 100644
--- a/minui/resources.c
+++ b/minui/resources.c
@@ -93,22 +93,23 @@ int res_create_surface(const char* name, gr_surface* pSurface) {
     png_set_sig_bytes(png_ptr, sizeof(header));
     png_read_info(png_ptr, info_ptr);
 
-    size_t width = info_ptr->width;
-    size_t height = info_ptr->height;
-    size_t stride = 4 * width;
-    size_t pixelSize = stride * height;
-
     int color_type = info_ptr->color_type;
     int bit_depth = info_ptr->bit_depth;
     int channels = info_ptr->channels;
     if (!(bit_depth == 8 &&
           ((channels == 3 && color_type == PNG_COLOR_TYPE_RGB) ||
            (channels == 4 && color_type == PNG_COLOR_TYPE_RGBA) ||
-           (channels == 1 && color_type == PNG_COLOR_TYPE_PALETTE)))) {
+           (channels == 1 && (color_type == PNG_COLOR_TYPE_PALETTE ||
+                              color_type == PNG_COLOR_TYPE_GRAY))))) {
         return -7;
         goto exit;
     }
 
+    size_t width = info_ptr->width;
+    size_t height = info_ptr->height;
+    size_t stride = (color_type == PNG_COLOR_TYPE_GRAY ? 1 : 4) * width;
+    size_t pixelSize = stride * height;
+
     surface = malloc(sizeof(GGLSurface) + pixelSize);
     if (surface == NULL) {
         result = -8;
@@ -120,8 +121,8 @@ int res_create_surface(const char* name, gr_surface* pSurface) {
     surface->height = height;
     surface->stride = width; /* Yes, pixels, not bytes */
     surface->data = pData;
-    surface->format = (channels == 3) ?
-            GGL_PIXEL_FORMAT_RGBX_8888 : GGL_PIXEL_FORMAT_RGBA_8888;
+    surface->format = (channels == 3) ? GGL_PIXEL_FORMAT_RGBX_8888 :
+        ((color_type == PNG_COLOR_TYPE_PALETTE ? GGL_PIXEL_FORMAT_RGBA_8888 : GGL_PIXEL_FORMAT_L_8));
 
     int alpha = 0;
     if (color_type == PNG_COLOR_TYPE_PALETTE) {
@@ -131,6 +132,9 @@ int res_create_surface(const char* name, gr_surface* pSurface) {
         png_set_tRNS_to_alpha(png_ptr);
         alpha = 1;
     }
+    if (color_type == PNG_COLOR_TYPE_GRAY) {
+        alpha = 1;
+    }
 
     unsigned int y;
     if (channels == 3 || (channels == 1 && !alpha)) {