From d54cf445cf09b7e9cf7812f24fd3f4bf356081a4 Mon Sep 17 00:00:00 2001
From: Romain Goyet <romain@goyet.com>
Date: Thu, 14 May 2015 20:09:05 +0200
Subject: [PATCH] Rasterizer generate C files

---
 fonts/rasterizer.c | 78 +++++++++++++++++++++++++++++++++++++---------
 1 file changed, 63 insertions(+), 15 deletions(-)

diff --git a/fonts/rasterizer.c b/fonts/rasterizer.c
index 481e861fb..dfc1b3364 100644
--- a/fonts/rasterizer.c
+++ b/fonts/rasterizer.c
@@ -21,9 +21,9 @@
 // Pixel format is RGB888
 
 typedef struct {
-  char red;
-  char green;
-  char blue;
+  unsigned char red;
+  unsigned char green;
+  unsigned char blue;
 } pixel_t;
 
 typedef struct {
@@ -37,6 +37,16 @@ typedef struct {
 void writeImageToPNGFile(image_t * image, char * filename);
 #endif
 
+#define CHARACTER_RANGE_START 0x20
+#define CHARACTER_RANGE_END 0x7E
+
+#define GRID_WIDTH 19
+#define GRID_HEIGHT 5
+
+#if (GRID_WIDTH*GRID_HEIGHT < (CHARACTER_RANGE_END-CHARACTER_RANGE_START+1))
+#error Grid too small. Consider increasing GRID_WIDTH or GRID_HEIGHT
+#endif
+
 
 void drawGlyphInImage(FT_Bitmap * glyphBitmap, image_t * image, int x, int y);
 
@@ -67,13 +77,11 @@ int main(int argc, char * argv[]) {
   int maxHeight = 0;
   int maxWidth = 0;
   int minTop = requested_glyph_height;
-  for (int i=0x28; i<0x7E;i++) {
-    unsigned char character = (unsigned char)i;
+  for (unsigned char character = CHARACTER_RANGE_START; character <= CHARACTER_RANGE_END; character++) {
     ENSURE(!FT_Load_Char(face, character, FT_LOAD_RENDER), "Loading character 0x%02x", character);
     int top = requested_glyph_height - face->glyph->bitmap_top;
     int height = top + face->glyph->bitmap.rows;
     int width = face->glyph->bitmap.width;
-    printf("Character %c(%x) has top %d\n", character, character, top);
     if (top < minTop) {
       minTop = top;
     }
@@ -85,16 +93,16 @@ int main(int argc, char * argv[]) {
     }
   }
 
-  int glyph_height = maxHeight-minTop;
   int glyph_width = maxWidth;
+  int glyph_height = maxHeight-minTop;
   printf("Actual glyph size = %dx%d\n", glyph_width, glyph_height);
 
-  int grid_size = 10;
+  int grid_size = 1;
 
-  bitmap_image.width = 16*glyph_width+15*grid_size;
-  bitmap_image.height = 16*glyph_height+15*grid_size;
+  bitmap_image.width = GRID_WIDTH*glyph_width+(GRID_WIDTH-1)*grid_size;
+  bitmap_image.height = GRID_HEIGHT*glyph_height+(GRID_HEIGHT-1)*grid_size;
   bitmap_image.pixels = malloc(sizeof(pixel_t)*bitmap_image.width*bitmap_image.height);
-  ENSURE(bitmap_image.pixels != NULL, "Allocating bitmap image of size %dx%d at %ld bytes per pixel", glyph_width*16, glyph_height*16, sizeof(pixel_t));
+  ENSURE(bitmap_image.pixels != NULL, "Allocating bitmap image of size %dx%d at %ld bytes per pixel", bitmap_image.width, bitmap_image.height, sizeof(pixel_t));
 
   // Draw the grid and the background
   for (int i = 0; i<bitmap_image.width;i++) {
@@ -110,10 +118,9 @@ int main(int argc, char * argv[]) {
 
 
   // We're doing the ASCII table, so characters from 0 to 255 inclusive
-  for (int i=0x28; i<0x7E; i++) {
-    unsigned char character = (unsigned char)i;
-    int x = character%16;
-    int y = character/16;
+  for (unsigned char character = CHARACTER_RANGE_START; character <= CHARACTER_RANGE_END; character++) {
+    int x = (character-CHARACTER_RANGE_START)%(GRID_WIDTH);
+    int y = (character-CHARACTER_RANGE_START)/(GRID_WIDTH);
     // FT_LOAD_RENDER: Render the glyph upon load
     ENSURE(!FT_Load_Char(face, character, FT_LOAD_RENDER), "Loading character 0x%02x", character);
     //printf("Advances = %dx%d\n", face->glyph->bitmap_left, face->glyph->bitmap_top);
@@ -127,6 +134,47 @@ int main(int argc, char * argv[]) {
   writeImageToPNGFile(&bitmap_image, "out.png");
 #endif
 
+  FILE * headerFile = fopen("out.h", "w");
+  fprintf(headerFile, "/* Auto-generated by rasterizer */\n\n");
+  fprintf(headerFile, "#define BITMAP_FONT_FIRST_CHARACTER 0x%2x\n", CHARACTER_RANGE_START);
+  fprintf(headerFile, "#define BITMAP_FONT_LAST_CHARACTER 0x%2x\n\n", CHARACTER_RANGE_END);
+  fprintf(headerFile, "#define BITMAP_FONT_CHARACTER_WIDTH %d\n", glyph_width);
+  fprintf(headerFile, "#define BITMAP_FONT_CHARACTER_HEIGHT %d\n\n", glyph_height);
+  fprintf(headerFile, "extern unsigned char bitmapFont[%d][%d][%d];\n", CHARACTER_RANGE_END-CHARACTER_RANGE_START+1, glyph_width, glyph_height);
+  fclose(headerFile);
+
+  FILE * sourceFile = fopen("out.c", "w");
+  fprintf(sourceFile, "/* Auto-generated by rasterizer */\n\n");
+  fprintf(sourceFile, "unsigned char bitmapFont[%d][%d][%d] = {\n", CHARACTER_RANGE_END-CHARACTER_RANGE_START+1, glyph_width, glyph_height);
+  for (unsigned char character = CHARACTER_RANGE_START; character <= CHARACTER_RANGE_END; character++) {
+    fprintf(sourceFile, "  {\n");
+    int characterX = ((character-CHARACTER_RANGE_START)%GRID_WIDTH * (glyph_width+grid_size));
+    int characterY = ((character-CHARACTER_RANGE_START)/GRID_WIDTH * (glyph_height+grid_size));
+    for (int y = 0; y < glyph_height; y++) {
+      fprintf(sourceFile, "    {");
+      for (int x = 0; x < glyph_width; x++) {
+        pixel_t * pixel = (bitmap_image.pixels + (y+characterY)*bitmap_image.width + (x+characterX));
+        fprintf(sourceFile, "0x%02x", pixel->green);
+        if (x+1 < glyph_width) {
+          fprintf(sourceFile, ", ");
+        }
+      }
+      fprintf(sourceFile, "}");
+      if (y+1 < glyph_height) {
+        fprintf(sourceFile, ",");
+      }
+      fprintf(sourceFile, "\n");
+    }
+    fprintf(sourceFile, "  }");
+    if (character+1 <= CHARACTER_RANGE_END) {
+      fprintf(sourceFile, ",");
+    }
+    fprintf(sourceFile, "\n");
+  }
+
+  fprintf(sourceFile, "};\n");
+  fclose(sourceFile);
+
   free(bitmap_image.pixels);
 
   return 0;