[U-Boot] [PATCH] video: cfb_console.c: add support for RLE8 bitmaps
Anatolij Gustschin
agust at denx.de
Mon Mar 15 14:50:25 CET 2010
Allow displaying 8-bit RLE BMP images.
Signed-off-by: Anatolij Gustschin <agust at denx.de>
---
README | 6 ++
drivers/video/cfb_console.c | 200 ++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 204 insertions(+), 2 deletions(-)
diff --git a/README b/README
index 1158e24..f469bd3 100644
--- a/README
+++ b/README
@@ -1133,6 +1133,12 @@ The following options need to be configured:
images, gzipped BMP images can be displayed via the
splashscreen support or the bmp command.
+- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
+
+ If this option is set, 8-bit RLE compressed BMP images
+ can be displayed via the splashscreen support or the
+ bmp command.
+
- Compression support:
CONFIG_BZIP2
diff --git a/drivers/video/cfb_console.c b/drivers/video/cfb_console.c
index 49f0a2e..d1f47c9 100644
--- a/drivers/video/cfb_console.c
+++ b/drivers/video/cfb_console.c
@@ -803,8 +803,193 @@ static void inline fill_555rgb_pswap(uchar *fb, int x,
#endif
/*
+ * RLE8 bitmap support
+ */
+
+#ifdef CONFIG_VIDEO_BMP_RLE8
+/* Pre-calculated color table entry */
+struct palette {
+ union {
+ unsigned short w; /* word */
+ unsigned int dw; /* double word */
+ } ce; /* color entry */
+};
+
+/*
+ * Helper to draw encoded/unencoded run.
+ */
+static void draw_bitmap (uchar **fb, uchar *bm, struct palette *p,
+ int cnt, int enc)
+{
+ ulong addr = (ulong)*fb;
+ int *off;
+ int enc_off = 1;
+ int i;
+
+ /*
+ * Setup offset of the color index in the bitmap.
+ * Color index of encoded run is at offset 1.
+ */
+ off = enc ? &enc_off : &i;
+
+ switch (VIDEO_DATA_FORMAT) {
+ case GDF__8BIT_INDEX:
+ for (i = 0; i < cnt; i++)
+ *(unsigned char *)addr++ = bm[*off];
+ break;
+ case GDF_15BIT_555RGB:
+ case GDF_16BIT_565RGB:
+ /* differences handled while pre-calculating palette */
+ for (i = 0; i < cnt; i++) {
+ *(unsigned short *)addr = p[bm[*off]].ce.w;
+ addr += 2;
+ }
+ break;
+ case GDF_32BIT_X888RGB:
+ for (i = 0; i < cnt; i++) {
+ *(unsigned long *)addr = p[bm[*off]].ce.dw;
+ addr += 4;
+ }
+ break;
+ }
+ *fb = (uchar *)addr; /* return modified address */
+}
+
+static int display_rle8_bitmap (bmp_image_t *img, int xoff, int yoff,
+ int width, int height)
+{
+ unsigned char *bm;
+ unsigned char *fbp;
+ unsigned int cnt, runlen;
+ int decode = 1;
+ int x, y, bpp, i, ncolors;
+ struct palette p[256];
+ bmp_color_table_entry_t cte;
+ int green_shift, red_off;
+
+ x = 0;
+ y = __le32_to_cpu(img->header.height) - 1;
+ ncolors = __le32_to_cpu(img->header.colors_used);
+ bpp = VIDEO_PIXEL_SIZE;
+ fbp = (unsigned char *)((unsigned int)video_fb_address +
+ (((y + yoff) * VIDEO_COLS) + xoff) * bpp);
+
+ bm = (uchar *)img + __le32_to_cpu(img->header.data_offset);
+
+ /* pre-calculate and setup palette */
+ switch (VIDEO_DATA_FORMAT) {
+ case GDF__8BIT_INDEX:
+ for (i = 0; i < ncolors; i++) {
+ cte = img->color_table[i];
+ video_set_lut (i, cte.red, cte.green, cte.blue);
+ }
+ break;
+ case GDF_15BIT_555RGB:
+ case GDF_16BIT_565RGB:
+ if (VIDEO_DATA_FORMAT == GDF_15BIT_555RGB) {
+ green_shift = 3;
+ red_off = 10;
+ } else {
+ green_shift = 2;
+ red_off = 11;
+ }
+ for (i = 0; i < ncolors; i++) {
+ cte = img->color_table[i];
+ p[i].ce.w = SWAP16((unsigned short)
+ (((cte.red >> 3) << red_off) |
+ ((cte.green >> green_shift) << 5) |
+ cte.blue >> 3));
+ }
+ break;
+ case GDF_32BIT_X888RGB:
+ for (i = 0; i < ncolors; i++) {
+ cte = img->color_table[i];
+ p[i].ce.dw = SWAP32((cte.red << 16) | (cte.green << 8) |
+ cte.blue);
+ }
+ break;
+ default:
+ printf("RLE Bitmap unsupported in video mode 0x%x\n",
+ VIDEO_DATA_FORMAT);
+ return -1;
+ }
+
+ while (decode) {
+ switch (bm[0]) {
+ case 0:
+ switch (bm[1]) {
+ case 0:
+ /* scan line end marker */
+ bm += 2;
+ x = 0;
+ y--;
+ fbp = (unsigned char *)
+ ((unsigned int)video_fb_address +
+ (((y + yoff) * VIDEO_COLS) +
+ xoff) * bpp);
+ continue;
+ case 1:
+ /* end of bitmap data marker */
+ decode = 0;
+ break;
+ case 2:
+ /* run offset marker */
+ x += bm[2];
+ y -= bm[3];
+ fbp = (unsigned char *)
+ ((unsigned int)video_fb_address +
+ (((y + yoff) * VIDEO_COLS) +
+ x + xoff) * bpp);
+ bm += 4;
+ break;
+ default:
+ /* unencoded run */
+ cnt = bm[1];
+ runlen = cnt;
+ bm += 2;
+ if (y < height) {
+ if (x >= width) {
+ x += runlen;
+ goto next_run;
+ }
+ if (x + runlen > width)
+ cnt = width - x;
+
+ draw_bitmap (&fbp, bm, p, cnt, 0);
+ x += runlen;
+ }
+next_run:
+ bm += runlen;
+ if (runlen & 1)
+ bm++; /* 0 padding if length is odd */
+ }
+ break;
+ default:
+ /* encoded run */
+ if (y < height) { /* only draw into visible area */
+ cnt = bm[0];
+ runlen = cnt;
+ if (x >= width) {
+ x += runlen;
+ bm += 2;
+ continue;
+ }
+ if (x + runlen > width)
+ cnt = width - x;
+
+ draw_bitmap (&fbp, bm, p, cnt, 1);
+ x += runlen;
+ }
+ bm += 2;
+ break;
+ }
+ }
+ return 0;
+}
+#endif
+
+/*
* Display the BMP file located at address bmp_image.
- * Only uncompressed
*/
int video_display_bitmap (ulong bmp_image, int x, int y)
{
@@ -872,7 +1057,11 @@ int video_display_bitmap (ulong bmp_image, int x, int y)
debug ("Display-bmp: %d x %d with %d colors\n",
width, height, colors);
- if (compression != BMP_BI_RGB) {
+ if (compression != BMP_BI_RGB
+#ifdef CONFIG_VIDEO_BMP_RLE8
+ && compression != BMP_BI_RLE8
+#endif
+ ) {
printf ("Error: compression type %ld not supported\n",
compression);
#ifdef CONFIG_VIDEO_BMP_GZIP
@@ -906,6 +1095,13 @@ int video_display_bitmap (ulong bmp_image, int x, int y)
((y + height - 1) * VIDEO_COLS * VIDEO_PIXEL_SIZE) +
x * VIDEO_PIXEL_SIZE);
+#ifdef CONFIG_VIDEO_BMP_RLE8
+ if (compression == BMP_BI_RLE8) {
+ return display_rle8_bitmap(bmp,
+ x, y, width, height);
+ }
+#endif
+
/* We handle only 8bpp or 24 bpp bitmap */
switch (le16_to_cpu (bmp->header.bit_count)) {
case 8:
--
1.6.3.3
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