[SeaBIOS] [PATCH 4/5] Autodetect video mode based on bootsplash jpeg dimensions.
Kevin O'Connor
kevin at koconnor.net
Fri Jul 30 20:15:52 CEST 2010
Replace video mode settings in config.h with a system to auto-detect a
video mode for the given bootsplash.jpg file.
---
src/bootsplash.c | 108 ++++++++++++++++++++++++++++++++++-------------------
src/config.h | 8 ----
2 files changed, 69 insertions(+), 47 deletions(-)
diff --git a/src/bootsplash.c b/src/bootsplash.c
index f7ca6f7..f070d7d 100644
--- a/src/bootsplash.c
+++ b/src/bootsplash.c
@@ -67,7 +67,7 @@ struct vesa_mode_info
u8 reserved_mask_size;
u8 reserved_mask_pos;
u8 direct_color_mode_info;
- u32 phys_base_ptr;
+ void *phys_base_ptr;
u32 offscreen_mem_offset;
u16 offscreen_mem_size;
u8 reserved[206];
@@ -106,6 +106,40 @@ static void enable_vga_text_console(void)
printf("SeaBIOS (version %s)\n\n", VERSION);
}
+static int
+find_videomode(struct vesa_info *vesa_info, struct vesa_mode_info *mode_info
+ , int width, int height)
+{
+ dprintf(3, "Finding vesa mode with dimensions %d/%d\n", width, height);
+ u16 *videomodes = SEGOFF_TO_FLATPTR(vesa_info->video_mode_ptr);
+ for (;; videomodes++) {
+ u16 videomode = *videomodes;
+ if (videomode == 0xffff) {
+ dprintf(1, "Unable to find vesa video mode dimensions %d/%d\n"
+ , width, height);
+ return -1;
+ }
+ struct bregs br;
+ memset(&br, 0, sizeof(br));
+ br.ax = 0x4f01;
+ br.cx = (1 << 14) | videomode;
+ br.di = FLATPTR_TO_OFFSET(mode_info);
+ br.es = FLATPTR_TO_SEG(mode_info);
+ call16_int10(&br);
+ if (br.ax != 0x4f) {
+ dprintf(1, "get_mode failed.\n");
+ continue;
+ }
+ if (mode_info->x_resolution != width
+ || mode_info->y_resolution != height)
+ continue;
+ u8 depth = mode_info->bits_per_pixel;
+ if (depth != 16 && depth != 24 && depth != 32)
+ continue;
+ return videomode;
+ }
+}
+
void enable_vga_console(void)
{
struct vesa_info *vesa_info = NULL;
@@ -121,14 +155,11 @@ void enable_vga_console(void)
goto gotext;
int filesize = cbfs_datasize(file);
- int imagesize = (CONFIG_BOOTSPLASH_X * CONFIG_BOOTSPLASH_Y *
- (CONFIG_BOOTSPLASH_DEPTH / 8));
filedata = malloc_tmphigh(filesize);
- picture = malloc_tmphigh(imagesize);
vesa_info = malloc_tmplow(sizeof(*vesa_info));
mode_info = malloc_tmplow(sizeof(*mode_info));
jpeg = jpeg_alloc();
- if (!filedata || !picture || !vesa_info || !mode_info || !jpeg) {
+ if (!filedata || !jpeg || !vesa_info || !mode_info) {
warn_noalloc();
goto gotext;
}
@@ -150,55 +181,54 @@ void enable_vga_console(void)
/* Print some debugging information about our card. */
char *vendor = SEGOFF_TO_FLATPTR(vesa_info->oem_vendor_name_ptr);
char *product = SEGOFF_TO_FLATPTR(vesa_info->oem_product_name_ptr);
- dprintf(8, "VESA %d.%d\nVENDOR: %s\nPRODUCT: %s\n",
+ dprintf(3, "VESA %d.%d\nVENDOR: %s\nPRODUCT: %s\n",
vesa_info->vesa_version>>8, vesa_info->vesa_version&0xff,
vendor, product);
- /* Get information about our graphics mode, like the
- * framebuffer start address
- */
- memset(&br, 0, sizeof(br));
- br.ax = 0x4f01;
- br.cx = (1 << 14) | CONFIG_BOOTSPLASH_VESA_MODE;
- br.di = FLATPTR_TO_OFFSET(mode_info);
- br.es = FLATPTR_TO_SEG(mode_info);
- call16_int10(&br);
- if (br.ax != 0x4f) {
- dprintf(1, "get_mode failed.\n");
+ // Parse jpeg and get image size.
+ cbfs_copyfile(file, filedata, filesize);
+ int ret = jpeg_decode(jpeg, filedata);
+ if (ret) {
+ dprintf(1, "jpeg_decode failed with return code %d...\n", ret);
+ goto gotext;
+ }
+ int width, height;
+ jpeg_get_size(jpeg, &width, &height);
+
+ // Try to find a graphics mode with the corresponding dimensions.
+ int videomode = find_videomode(vesa_info, mode_info, width, height);
+ if (videomode < 0)
+ goto gotext;
+ void *framebuffer = mode_info->phys_base_ptr;
+ int depth = mode_info->bits_per_pixel;
+ dprintf(3, "mode: %04x\n", videomode);
+ dprintf(3, "framebuffer: %p\n", framebuffer);
+ 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.
+ int imagesize = width * height * (depth / 8);
+ picture = malloc_tmphigh(imagesize);
+ if (!picture) {
+ warn_noalloc();
+ goto gotext;
+ }
+ ret = jpeg_show(jpeg, picture, width, height, depth);
+ if (ret) {
+ dprintf(1, "jpeg_show failed with return code %d...\n", ret);
goto gotext;
}
- unsigned char *framebuffer = (unsigned char *) (mode_info->phys_base_ptr);
/* Switch to graphics mode */
memset(&br, 0, sizeof(br));
br.ax = 0x4f02;
- br.bx = (1 << 14) | CONFIG_BOOTSPLASH_VESA_MODE;
+ br.bx = (1 << 14) | videomode;
call16_int10(&br);
if (br.ax != 0x4f) {
dprintf(1, "set_mode failed.\n");
goto gotext;
}
- dprintf(8, "framebuffer: %x\n", (u32)framebuffer);
- dprintf(8, "bytes per scanline: %d\n", mode_info->bytes_per_scanline);
- dprintf(8, "bits per pixel: %d\n", mode_info->bits_per_pixel);
-
- /* Decompress jpeg */
- dprintf(8, "Copying boot splash screen...\n");
- cbfs_copyfile(file, filedata, filesize);
- dprintf(8, "Decompressing boot splash screen...\n");
- int ret = jpeg_decode(jpeg, filedata);
- if (ret) {
- dprintf(1, "jpeg_decode failed with return code %d...\n", ret);
- goto gotext;
- }
- ret = jpeg_show(jpeg, picture, CONFIG_BOOTSPLASH_X, CONFIG_BOOTSPLASH_Y
- , CONFIG_BOOTSPLASH_DEPTH);
- if (ret) {
- dprintf(1, "jpeg_show failed with return code %d...\n", ret);
- goto gotext;
- }
-
/* Show the picture */
iomemcpy(framebuffer, picture, imagesize);
SET_EBDA(bootsplash_active, 1);
diff --git a/src/config.h b/src/config.h
index a7a6ccc..3dcbcf5 100644
--- a/src/config.h
+++ b/src/config.h
@@ -123,14 +123,6 @@
#define CONFIG_S3_RESUME_VGA_INIT 0
// Support boot splash
#define CONFIG_BOOTSPLASH 0
-// boot splash X resolution
-#define CONFIG_BOOTSPLASH_X 1024
-// boot splash Y resolution
-#define CONFIG_BOOTSPLASH_Y 768
-// boot splash color depth
-#define CONFIG_BOOTSPLASH_DEPTH 16
-// boot splash VESA mode (could be generated)
-#define CONFIG_BOOTSPLASH_VESA_MODE 0x117
// define it if the (emulated) hardware supports SMM mode
#define CONFIG_USE_SMM 1
// Maximum number of map entries in the e820 map
--
1.7.2
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