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(a)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);
--
2.20.1
