Fix recovery image text rendering.

Previously most devices would lose the character before a line wrap.
The log's text rendering was starting at offset 4 but none of the
arithmetic was taking this into account. It just happened to work
on the Nexus 9's 1536-pixel wide display (1536/18=85.3) but not on
a device such as the Nexus 5 (1080/18=60).

The only active part of this change is the change from 4 to 0 in the
gr_text call. The rest is just a few bits of trivial cleanup while I
was working out what was going on.

Change-Id: I9279ae323c77bc8b6ea87dc0fe009aaaec6bfa0e

1 files changed, 19 insertions, 23 deletions

diff --git a/minui/graphics.c b/minui/graphics.c
index 870ffa08..1a9be6cb 100644
--- a/minui/graphics.c
+++ b/minui/graphics.c
@@ -77,11 +77,10 @@ static void text_blend(unsigned char* src_p, int src_row_bytes,
                        unsigned char* dst_p, int dst_row_bytes,
                        int width, int height)
 {
-    int i, j;
-    for (j = 0; j < height; ++j) {
+    for (int j = 0; j < height; ++j) {
         unsigned char* sx = src_p;
         unsigned char* px = dst_p;
-        for (i = 0; i < width; ++i) {
+        for (int i = 0; i < width; ++i) {
             unsigned char a = *sx++;
             if (gr_current_a < 255) a = ((int)a * gr_current_a) / 255;
             if (a == 255) {
@@ -106,34 +105,33 @@ static void text_blend(unsigned char* src_p, int src_row_bytes,
     }
 }
 
-
 void gr_text(int x, int y, const char *s, int bold)
 {
-    GRFont *font = gr_font;
-    unsigned off;
+    GRFont* font = gr_font;
 
-    if (!font->texture) return;
-    if (gr_current_a == 0) return;
+    if (!font->texture || gr_current_a == 0) return;
 
     bold = bold && (font->texture->height != font->cheight);
 
     x += overscan_offset_x;
     y += overscan_offset_y;
 
-    while((off = *s++)) {
-        off -= 32;
+    unsigned char ch;
+    while ((ch = *s++)) {
         if (outside(x, y) || outside(x+font->cwidth-1, y+font->cheight-1)) break;
-        if (off < 96) {
 
-            unsigned char* src_p = font->texture->data + (off * font->cwidth) +
-                (bold ? font->cheight * font->texture->row_bytes : 0);
-            unsigned char* dst_p = gr_draw->data + y*gr_draw->row_bytes + x*gr_draw->pixel_bytes;
+        if (ch < ' ' || ch > '~') {
+            ch = '?';
+        }
 
-            text_blend(src_p, font->texture->row_bytes,
-                       dst_p, gr_draw->row_bytes,
-                       font->cwidth, font->cheight);
+        unsigned char* src_p = font->texture->data + ((ch - ' ') * font->cwidth) +
+                               (bold ? font->cheight * font->texture->row_bytes : 0);
+        unsigned char* dst_p = gr_draw->data + y*gr_draw->row_bytes + x*gr_draw->pixel_bytes;
+
+        text_blend(src_p, font->texture->row_bytes,
+                   dst_p, gr_draw->row_bytes,
+                   font->cwidth, font->cheight);
 
-        }
         x += font->cwidth;
     }
 }
@@ -176,14 +174,12 @@ void gr_color(unsigned char r, unsigned char g, unsigned char b, unsigned char a
 
 void gr_clear()
 {
-    if (gr_current_r == gr_current_g &&
-        gr_current_r == gr_current_b) {
+    if (gr_current_r == gr_current_g && gr_current_r == gr_current_b) {
         memset(gr_draw->data, gr_current_r, gr_draw->height * gr_draw->row_bytes);
     } else {
-        int x, y;
         unsigned char* px = gr_draw->data;
-        for (y = 0; y < gr_draw->height; ++y) {
-            for (x = 0; x < gr_draw->width; ++x) {
+        for (int y = 0; y < gr_draw->height; ++y) {
+            for (int x = 0; x < gr_draw->width; ++x) {
                 *px++ = gr_current_r;
                 *px++ = gr_current_g;
                 *px++ = gr_current_b;