Specifically added support for 16 and 32bpp files, in addition to 24bpp. The function bmp_show() in bmp.c has had the hardcoded check for 24bpp replaced with a general bpp check that uses a % to check for remainder, and returns 1 if the remainder is >0. The previous method for adjusting the BMP data (raw_data_format_adjust_24bpp) relied on a preset 3*bytes_per_line_src, this has been changed and the multiplication is now performed in the function's arguments. This change still allows someone else to reuse the same function for 1/2/4bpp support if necessary. The file util.h has been modified to reflect this decision.
The changes to raw_data_format_adjust() is based on an abandoned patch by Gert Menke (submitted March 14, 2017), credit to them for that change and the addition of *bpp to bmp_get_info().
Any feedback? I would appreciate it.
Signed-off-by: Joseph S. Pacheco-Corwin hammersamatom@gmail.com --- src/bmp.c | 19 +++++++++---------- src/bootsplash.c | 17 +++++++++++++---- src/util.h | 2 +- 3 files changed, 23 insertions(+), 15 deletions(-)
diff --git a/src/bmp.c b/src/bmp.c index 96a2b3f..fecc295 100644 --- a/src/bmp.c +++ b/src/bmp.c @@ -56,10 +56,9 @@ typedef struct tagRGBQUAD { * arrange horizontal pixel data, add extra space in the dest buffer * for every line */ -static void raw_data_format_adjust_24bpp(u8 *src, u8 *dest, int width, - int height, int bytes_per_line_dest) +static void raw_data_format_adjust(u8 *src, u8 *dest, int width, + int height, int bytes_per_line_src, int bytes_per_line_dest) { - int bytes_per_line_src = 3 * width; int i; for (i = 0 ; i < height ; i++) { memcpy(dest + i * bytes_per_line_dest, @@ -95,22 +94,22 @@ int bmp_decode(struct bmp_decdata *bmp, unsigned char *data, int data_size) }
/* get bmp properties */ -void bmp_get_size(struct bmp_decdata *bmp, int *width, int *height) +void bmp_get_info(struct bmp_decdata *bmp, int *width, int *height, int *bpp) { *width = bmp->width; *height = bmp->height; + *bpp = bmp->bpp; }
/* flush flat picture data to *pc */ -int bmp_show(struct bmp_decdata *bmp, unsigned char *pic, int width - , int height, int depth, int bytes_per_line_dest) +int bmp_show(struct bmp_decdata *bmp, unsigned char *pic, int width, + int height, int depth, int bytes_per_line_dest) { if (bmp->datap == pic) return 0; - /* now only support 24bpp bmp file */ - if ((depth == 24) && (bmp->bpp == 24)) { - raw_data_format_adjust_24bpp(bmp->datap, pic, width, height, - bytes_per_line_dest); + if ((depth == bmp->bpp) && (bmp->bpp%8 == 0)) { + raw_data_format_adjust(bmp->datap, pic, width, height, + (bmp->bpp/8)*width, bytes_per_line_dest); return 0; } return 1; diff --git a/src/bootsplash.c b/src/bootsplash.c index 165c98d..401c348 100644 --- a/src/bootsplash.c +++ b/src/bootsplash.c @@ -172,10 +172,13 @@ enable_bootsplash(void) dprintf(1, "bmp_decode failed with return code %d...\n", ret); goto done; } - bmp_get_size(bmp, &width, &height); - bpp_require = 24; + bmp_get_info(bmp, &width, &height, &bpp_require); } - /* jpeg would use 16 or 24 bpp video mode, BMP use 24bpp mode only */ + + /* jpeg would use 16 or 24 bpp video mode, BMP uses 8/16/24/32 bpp mode. + * 8bpp for BMP has corrupted colors, and lower than 8bpp fails to display + * or results in a loop. + */
// Try to find a graphics mode with the corresponding dimensions. int videomode = find_videomode(vesa_info, mode_info, width, height, @@ -192,7 +195,13 @@ enable_bootsplash(void) dprintf(3, "bytes per scanline: %d\n", mode_info->bytes_per_scanline); dprintf(3, "bits per pixel: %d\n", depth);
- // Allocate space for image and decompress it. + // Allocate space for image and decompress it. + /* + * Has a weird issue with low bpp image files, imagesize is not + * consistent. Example: 8bpp images are correct, being essentially + * multiplied/divided by 1, but if you use 4bpp images, width is divided by + * 8, when it should be divided by 2. + */ int imagesize = height * mode_info->bytes_per_scanline; picture = malloc_tmphigh(imagesize); if (!picture) { diff --git a/src/util.h b/src/util.h index 6dd080f..9c06850 100644 --- a/src/util.h +++ b/src/util.h @@ -12,7 +12,7 @@ void handle_1553(struct bregs *regs); // bmp.c struct bmp_decdata *bmp_alloc(void); int bmp_decode(struct bmp_decdata *bmp, unsigned char *data, int data_size); -void bmp_get_size(struct bmp_decdata *bmp, int *width, int *height); +void bmp_get_info(struct bmp_decdata *bmp, int *width, int *height, int *bpp); int bmp_show(struct bmp_decdata *bmp, unsigned char *pic, int width , int height, int depth, int bytes_per_line_dest);