Heavily extended bmp2rb conversion tool: Handles 4, 16, 24 and 32 bit BMPs in addition to 1 and 8 bit. Generates one of 3 output formats: (0) Archos recorder, Ondio, Gmini, H1x0 monochrome; this is the default. (1) Archos player graphics library. (2) H1x0 4-shade greyscale. Decision about the pixel value is based on the true pixel brightness, so hopefully no more inverted images.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7058 a1c6a512-1295-4272-9138-f99709370657

tools/bmp2rb.c

@@ -16,13 +16,17 @@
  * KIND, either express or implied.
  *
  ****************************************************************************/
-/*********************************************************************
+/****************************************************************************
  *
  * Converts BMP files to Rockbox bitmap format
  *
  * 1999-05-03 Linus Nielsen Feltzing
  *
- **********************************************/
+ * 2005-07-06 Jens Arnold
+ *            added reading of 4, 16, 24 and 32 bit bmps
+ *            added 2 new target formats (playergfx and iriver 4-grey)
+ *
+ ****************************************************************************/
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -70,7 +74,6 @@ struct RGBQUAD
     unsigned char rgbReserved;
 } STRUCT_PACKED;
 
-
 short readshort(void* value)
 {
     unsigned char* bytes = (unsigned char*) value;
@@ -83,33 +86,38 @@ int readlong(void* value)
     return bytes[0] | (bytes[1] << 8) | (bytes[2] << 16) | (bytes[3] << 24);
 }
 
-/*********************************************************************
+unsigned char brightness(unsigned char red, unsigned char green,
+                         unsigned char blue)
+{
+    return (3 * (unsigned int)red + 6 * (unsigned int)green 
+              + (unsigned int)blue) / 10;
+}
+
+/****************************************************************************
  * read_bmp_file()
  *
- * Reads a 8bit BMP file and puts the data in a 1-pixel-per-byte
+ * Reads an uncompressed BMP file and puts the data in a 1-pixel-per-byte
- * array. Returns 0 on success.
+ * array, sorted by brightness. Returns 0 on success.
  *
- *********************************************************************/
+ ***************************************************************************/
+
 int read_bmp_file(char* filename,
-                  int *get_width,  /* in pixels */
+                  long *get_width,  /* in pixels */
-                  int *get_height, /* in pixels */
+                  long *get_height, /* in pixels */
-                  char **bitmap)
+                  unsigned char **bitmap)
 {
     struct Fileheader fh;
-    struct RGBQUAD palette[2]; /* two colors only */
+    struct RGBQUAD palette[256];
+    unsigned char bright[256];
 
-    unsigned int bitmap_width, bitmap_height;
-
-    long PaddedWidth;
-    int background;
     int fd = open(filename, O_RDONLY);
-    long size;
+    unsigned short data;
-    long allocsize;
-    unsigned int row, col;
-    int l;
     unsigned char *bmp;
-    int width;
+    long width, height;
-    int height;
+    long padded_width;
+    long size;
+    long row, col, i;
+    long numcolors, compression;
     int depth;
 
     if (fd == -1)
@@ -117,8 +125,6 @@ int read_bmp_file(char* filename,
         debugf("error - can't open '%s'\n", filename);
         return 1;
     }
-    else
-   {
     if (read(fd, &fh, sizeof(struct Fileheader)) !=
         sizeof(struct Fileheader))
     {
@@ -127,177 +133,232 @@ int read_bmp_file(char* filename,
         return 2;
     }
     
-     /* Exit if more than 8 bits */
+    compression = readlong(&fh.Compression);
-     depth = readshort(&fh.BitCount);
-     if(depth > 8)
-     {
-         debugf("error - Bitmap uses more than 8 bit depth, got %d\n",
-                depth);
-         close(fd);
-         return 2;
-     }
 
-     /* Exit if too wide */
+    if (compression != 0)
-     if(readlong(&fh.Width) > 160)
     {
-         debugf("error - Bitmap is too wide for iRiver models (%d pixels, max is 160)\n",
+        debugf("error - Unsupported compression %ld\n", compression);
-                readlong(&fh.Width));
+        close(fd);
         return 3;
     }
-     if(readlong(&fh.Width) > 112)
-     {
-         debugf("info - Bitmap is too wide for Archos models (%d pixels, max is 112)\n",
-                readlong(&fh.Width));
-     }
 
-     /* Exit if too high */
+    depth = readshort(&fh.BitCount);
-     if(readlong(&fh.Height) > 128)
-     {
-         debugf("error - Bitmap is too high for iRiver models (%d pixels, max is 128)\n",
-                readlong(&fh.Height));
-         return 4;
-     }
-     if(readlong(&fh.Height) > 64)
-     {
-         debugf("info - Bitmap is too high for Archos models (%d pixels, max is 64)\n",
-                readlong(&fh.Height));
-     }
 
-     for(l=0;l < 2;l++)
+    if (depth <= 8)
     {
-         if(read(fd, &palette[l],sizeof(struct RGBQUAD)) !=
+        numcolors = readlong(&fh.ClrUsed);
-            sizeof(struct RGBQUAD))
+        if (numcolors == 0)
+            numcolors = 1 << depth;
+
+        if (read(fd, &palette[0], numcolors * sizeof(struct RGBQUAD))
+           != numcolors * sizeof(struct RGBQUAD))
         {
             debugf("error - Can't read bitmap's color palette\n");
             close(fd);
-             return 5;
+            return 4;
-         }
-     }
-     if(depth == 8 ) {
-         /* pass the other palettes */
-         lseek(fd, 254*sizeof(struct RGBQUAD), SEEK_CUR);
         }
 
-     /* Try to guess the foreground and background colors.
+        /* Precalculate weighted brightnesses for the palette */
-        We assume that the foreground color is the darkest. */
+        for (i = 0; i < numcolors; i++)
-     if(((int)palette[0].rgbRed +
+            bright[i] = brightness(palette[i].rgbRed, palette[i].rgbGreen,
-         (int)palette[0].rgbGreen +
+                                   palette[i].rgbBlue);
-         (int)palette[0].rgbBlue) >
-        ((int)palette[1].rgbRed +
-         (int)palette[1].rgbGreen +
-         (int)palette[1].rgbBlue))
-     {
-         background = 0;
-     }
-     else
-     {
-         background = 1;
     }
 
     width = readlong(&fh.Width);
-
-      if(depth == 8)
-          PaddedWidth = ((width+3)&(~0x3)); /* aligned 4-bytes boundaries */
-      else
-          PaddedWidth = ((width+31)&(~0x1f))/8;
-
     height = readlong(&fh.Height);
+    padded_width = (width * depth / 8 + 3) & ~3; /* aligned 4-bytes boundaries */
 
-      allocsize = size = PaddedWidth*height; /* read this many bytes */
+    size = padded_width * height; /* read this many bytes */
     bmp = (unsigned char *)malloc(size);
+    *bitmap = (unsigned char *)malloc(width * height);
 
-      if(height%8) {
+    if ((bmp == NULL) || (*bitmap == NULL))
-          /* not even 8 bytes, add up to a full 8 pixels boundary */
-          height += 8-(height%8);
-          allocsize = PaddedWidth*height; /* bytes to alloc */
-      }
-
-      *bitmap = (unsigned char *)malloc(allocsize);
-
-      if(bmp == NULL)
     {
         debugf("error - Out of memory\n");
         close(fd);
+        return 5;
+    }
+
+    if (lseek(fd, (off_t)readlong(&fh.OffBits), SEEK_SET) < 0)
+    {
+        debugf("error - Can't seek to start of image data\n");
+        close(fd);
         return 6;
     }
-      else
+    if (read(fd, (unsigned char*)bmp, (long)size) != size)
     {
-          if(read(fd, (unsigned char*)bmp,(long)size) != size) {
         debugf("error - Can't read image\n");
         close(fd);
         return 7;
     }
-      }
 
-      bitmap_height = readlong(&fh.Height);
+    close(fd);
-      bitmap_width = readlong(&fh.Width);
+    *get_width = width;
+    *get_height = height;
 
-      *get_width = bitmap_width;
+    switch (depth)
-      *get_height = bitmap_height;
-
-      if(depth == 8)
     {
-          /* Now convert the bitmap into an array with 1 byte per pixel,
+      case 1:
-             exactly the size of the image */
+        for (row = 0; row < height; row++)
-          for(row = 0;row < bitmap_height;row++) {
+            for (col = 0; col < width; col++)
-              for(col = 0;col < bitmap_width;col++) {
-                  if(bmp[(bitmap_height-1 -row) * PaddedWidth + col]) {
-                      (*bitmap)[ (row/8) * bitmap_width + col ] &=
-                        ~ (1<<(row&7));
-                  }
-                  else {
-                      (*bitmap)[ (row/8) * bitmap_width + col ] |=
-                        1<<(row&7);
-                  }
-              }
-          }
-      }
-      else
             {
-          int bit;
+                data = (bmp[(height - 1 - row) * padded_width + col / 8] 
-          int byte;
+                        >> (~col & 7)) & 1;
-          /* monocrome BMP conversion uses 8 pixels per byte */
+                (*bitmap)[row * width + col] = bright[data];
-          for(row = 0; row < bitmap_height; row++) {
-              bit = 7;
-              byte = 0;
-              for(col = 0;col < bitmap_width;col++) {
-                  if((bmp[(bitmap_height - row - 1) * PaddedWidth + byte] &
-                      (1 << bit))) {
-                      (*bitmap)[(row/8) * bitmap_width + col ] &=
-                        ~(1<<(row&7));
             }
-                  else {
+        break;
-                      (*bitmap)[(row/8) * bitmap_width + col ] |= 
+
-                        1<<(row&7);
+      case 4:
+        for (row = 0; row < height; row++)
+            for (col = 0; col < width; col++)
+            {
+                data = (bmp[(height - 1 - row) * padded_width + col / 2] 
+                        >> (4 * (~col & 1))) & 0x0F;
+                (*bitmap)[row * width + col] = bright[data];
             }
-                  if(bit) {
+        break;
-                      bit--;
+
+      case 8:
+        for (row = 0; row < height; row++)
+            for (col = 0; col < width; col++)
+            {
+                data = bmp[(height - 1 - row) * padded_width + col];
+                (*bitmap)[row * width + col] = bright[data];
             }
-                  else {
+        break;
-                      bit = 7;
+        
-                      byte++;
+      case 16:
+        for (row = 0; row < height; row++)
+            for (col = 0; col < width; col++)
+            {
+                data = readshort(&bmp[(height - 1 - row) * padded_width + 2 * col]);
+                (*bitmap)[row * width + col] = brightness((data >> 7) & 0xF8, 
+                                       (data >> 2) & 0xF8, (data << 3) & 0xF8);
             }
+        break;
+
+      case 24:
+        for (row = 0; row < height; row++)
+            for (col = 0; col < width; col++)
+            {
+                i = (height - 1 - row) * padded_width + 3 * col;
+                (*bitmap)[row * width + col] =
+                         brightness(bmp[i+2], bmp[i+1], bmp[i]);
             }
+        break;
+
+      case 32:
+        for (row = 0; row < height; row++)
+            for (col = 0; col < width; col++)
+            {
+                i = (height - 1 - row) * padded_width + 4 * col;
+                (*bitmap)[row * width + col] =
+                         brightness(bmp[i+2], bmp[i+1], bmp[i]);
             }
+        break;
+
+      default: /* should never happen */
+        debugf("error - Unsupported bitmap depth %d.\n", depth);
+        return 8;
     }
 
     free(bmp);
     
-   }
-   close(fd);
     return 0; /* success */
 }
 
-/*********************************************************************
+/****************************************************************************
-** generate_c_source()
+ * transform_bitmap()
-**
+ *
-** Outputs a C source code with the bitmap in an array, accompanied by
+ * Transform a 1-byte-per-pixel bitmap into one of the supported
-** some #define's
+ * destination formats
-**********************************************************************/
+ ****************************************************************************/
-void generate_c_source(char *id, int width, int height, unsigned char *bitmap)
+
+int transform_bitmap(const unsigned char *src, long width, long height,
+                     int format, unsigned char **dest, long *dst_width,
+                     long *dst_height)
+{
+    long row, col;
+    long dst_w, dst_h;
+
+    switch (format)
+    {
+      case 0: /* Archos recorders, Ondio, Gmini 120/SP, Iriver H1x0 monochrome */
+        dst_w = width;
+        dst_h = (height + 7) / 8;
+        break;
+
+      case 1: /* Archos player graphics library */
+        dst_w = (width + 7) / 8;
+        dst_h = height;
+        break;
+
+      case 2: /* Iriver H1x0 4-grey */
+        dst_w = width;
+        dst_h = (height + 3) / 4;
+        break;
+
+      default: /* unknown */
+        debugf("error - Undefined destination format\n");
+        return 1;
+    }
+    
+    *dest = (unsigned char *)malloc(dst_w * dst_h);
+    if (*dest == NULL)
+    {
+        debugf("error - Out of memory.\n");
+        return 2;
+    }
+    memset(*dest, 0, dst_w * dst_h);
+    *dst_width = dst_w;
+    *dst_height = dst_h;
+
+    switch (format)
+    {
+      case 0: /* Archos recorders, Ondio, Gmini 120/SP, Iriver H1x0 b&w */
+        for (row = 0; row < height; row++)
+            for (col = 0; col < width; col++)
+            {
+                (*dest)[(row/8) * dst_w + col] |= 
+                       (~src[row * width + col] & 0x80) >> (~row & 7);
+            }
+        break;
+
+      case 1: /* Archos player graphics library */
+        for (row = 0; row < height; row++)
+            for (col = 0; col < width; col++)
+            {
+                (*dest)[row * dst_w + (col/8)] |= 
+                       (~src[row * width + col] & 0x80) >> (col & 7);
+            }
+        break;
+
+      case 2: /* Iriver H1x0 4-grey */
+        for (row = 0; row < height; row++)
+            for (col = 0; col < width; col++)
+            {
+                (*dest)[(row/4) * dst_w + col] |=
+                       (~src[row * width + col] & 0xC0) >> (2 * (~row & 3));
+            }
+        break;
+    }
+    
+    return 0;
+}
+
+/****************************************************************************
+ * generate_c_source()
+ *
+ * Outputs a C source code with the bitmap in an array, accompanied by
+ * some #define's
+ ****************************************************************************/
+
+void generate_c_source(char *id, long width, long height,
+                       const unsigned char *t_bitmap, long t_width,
+                       long t_height)
 {
     FILE *f;
-   unsigned int i, a, eline;
+    long i, a;
 
     f = stdout;
 
@@ -305,58 +366,56 @@ void generate_c_source(char *id, int width, int height, unsigned char *bitmap)
         id = "bitmap";
 
     fprintf(f,
-           "#define BMPHEIGHT_%s %d"
+            "#define BMPHEIGHT_%s %ld\n"
-           "\n#define BMPWIDTH_%s %d"
+            "#define BMPWIDTH_%s %ld\n"
-           "\nconst unsigned char %s[] = {\n",
+            "const unsigned char %s[] = {\n",
             id, height, id, width, id);
 
-   for(i=0, eline=0; i< height; i+=8, eline++) {
+    for (i = 0; i < t_height; i++)
-       for (a=0; a<width; a++)
+    {
-           fprintf(f, "0x%02x,%c", bitmap[eline*width + a],
+        for (a = 0; a < t_width; a++)
+            fprintf(f, "0x%02x,%c", t_bitmap[i * t_width + a],
                     (a + 1) % 13 ? ' ' : '\n');
         fprintf(f, "\n");
     }
 
-
     fprintf(f, "\n};\n");
 }
 
+/****************************************************************************
+ * generate_ascii()
+ *
+ * Outputs an ascii picture of the bitmap
+ ****************************************************************************/
 
-/*********************************************************************
+void generate_ascii(long width, long height, unsigned char *bitmap)
-** generate_ascii()
-**
-** Outputs an ascii picture of the bitmap
-**********************************************************************/
-void generate_ascii(int width, int height, unsigned char *bitmap)
 {
     FILE *f;
-    unsigned int i, eline;
+    long x, y;
 
     f = stdout;
 
     /* for screen output debugging */
-    for(i=0, eline=0; i< height; i+=8, eline++) {
+    for (y = 0; y < height; y++)
-        unsigned int x, y;
+    {
-        for(y=0; y<8 && (i+y < height); y++) {
+        for (x = 0; x < width; x++)
-            for(x=0; x < width; x++) {
+        {
-                
+            fprintf(f, (bitmap[y * width + x] & 0x80) ? " " : "*");
-                if(bitmap[eline*width + x] & (1<<y)) {
-                    fprintf(f, "*");
-                }
-                else
-                    fprintf(f, " ");
         }
         fprintf(f, "\n");
     }
 }
-}
 
 void print_usage(void)
 {
     printf("Usage: %s [-i <id>] [-a] <bitmap file>\n"
            "\t-i <id>  Bitmap name (default is filename without extension)\n"
-          "\t-a          Show ascii picture of bitmap\n",
+           "\t-a       Show ascii picture of bitmap\n"
-          APPLICATION_NAME);
+           "\t-f <n>   Generate destination format n, default = 0\n"
+           "\t         0  Archos recorder, Ondio, Gmini 120/SP, Iriver H1x0 mono\n"
+           "\t         1  Archos player graphics library\n"
+           "\t         2  Iriver H1x0 4-grey\n"
+           , APPLICATION_NAME);
     printf("build date: " __DATE__ "\n\n");
 }
 
@@ -365,9 +424,12 @@ int main(int argc, char **argv)
     char *bmp_filename = NULL;
     char *id = NULL;
     int i;
-   int height, width;
     int ascii = false;
-   char* bitmap = NULL;
+    int format = 0;
+    unsigned char *bitmap = NULL;
+    unsigned char *t_bitmap = NULL;
+    long width, height;
+    long t_width, t_height;
 
 
     for (i = 1;i < argc;i++)
@@ -393,10 +455,27 @@ int main(int argc, char **argv)
                 }
                 break;
 
-	case 'a':   /* Assembly */
+              case 'a':   /* Ascii art */
                 ascii = true;
                 break;
                 
+              case 'f':
+                if (argv[i][2])
+                {
+                    format = atoi(&argv[i][2]);
+                }
+                else if (argc > i+1)
+                {
+                    format = atoi(argv[i+1]);
+                    i++;
+                }
+                else
+                {
+                    print_usage();
+                    exit(1);
+                }
+                break;
+
               default:
                 print_usage();
                 exit(1);
@@ -437,12 +516,20 @@ int main(int argc, char **argv)
     }
 
     if (read_bmp_file(bmp_filename, &width, &height, &bitmap))
-       return 0;
+        exit(1);
+        
 
     if (ascii)
+    {
         generate_ascii(width, height, bitmap);
+    }
     else
-       generate_c_source(id, width, height, bitmap);
+    {
+        if (transform_bitmap(bitmap, width, height, format, &t_bitmap,
+                             &t_width, &t_height))
+            exit(1);
+        generate_c_source(id, width, height, t_bitmap, t_width, t_height);
+    }
 
     return 0;
 }