u-boot/drivers/video/video_bmp.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2015 Google, Inc
*/
#include <common.h>
#include <bmp_layout.h>
#include <dm.h>
#include <mapmem.h>
#include <video.h>
#include <watchdog.h>
#include <asm/unaligned.h>
#ifdef CONFIG_VIDEO_BMP_RLE8
#define BMP_RLE8_ESCAPE 0
#define BMP_RLE8_EOL 0
#define BMP_RLE8_EOBMP 1
#define BMP_RLE8_DELTA 2
static void draw_unencoded_bitmap(ushort **fbp, uchar *bmap, ushort *cmap,
int cnt)
{
while (cnt > 0) {
*(*fbp)++ = cmap[*bmap++];
cnt--;
}
}
static void draw_encoded_bitmap(ushort **fbp, ushort col, int cnt)
{
ushort *fb = *fbp;
while (cnt > 0) {
*fb++ = col;
cnt--;
}
*fbp = fb;
}
static void video_display_rle8_bitmap(struct udevice *dev,
struct bmp_image *bmp, ushort *cmap,
uchar *fb, int x_off, int y_off)
{
struct video_priv *priv = dev_get_uclass_priv(dev);
uchar *bmap;
ulong width, height;
ulong cnt, runlen;
int x, y;
int decode = 1;
debug("%s\n", __func__);
width = get_unaligned_le32(&bmp->header.width);
height = get_unaligned_le32(&bmp->header.height);
bmap = (uchar *)bmp + get_unaligned_le32(&bmp->header.data_offset);
x = 0;
y = height - 1;
while (decode) {
if (bmap[0] == BMP_RLE8_ESCAPE) {
switch (bmap[1]) {
case BMP_RLE8_EOL:
/* end of line */
bmap += 2;
x = 0;
y--;
/* 16bpix, 2-byte per pixel, width should *2 */
fb -= (width * 2 + priv->line_length);
break;
case BMP_RLE8_EOBMP:
/* end of bitmap */
decode = 0;
break;
case BMP_RLE8_DELTA:
/* delta run */
x += bmap[2];
y -= bmap[3];
/* 16bpix, 2-byte per pixel, x should *2 */
fb = (uchar *)(priv->fb + (y + y_off - 1)
* priv->line_length + (x + x_off) * 2);
bmap += 4;
break;
default:
/* unencoded run */
runlen = bmap[1];
bmap += 2;
if (y < height) {
if (x < width) {
if (x + runlen > width)
cnt = width - x;
else
cnt = runlen;
draw_unencoded_bitmap(
(ushort **)&fb,
bmap, cmap, cnt);
}
x += runlen;
}
bmap += runlen;
if (runlen & 1)
bmap++;
}
} else {
/* encoded run */
if (y < height) {
runlen = bmap[0];
if (x < width) {
/* aggregate the same code */
while (bmap[0] == 0xff &&
bmap[2] != BMP_RLE8_ESCAPE &&
bmap[1] == bmap[3]) {
runlen += bmap[2];
bmap += 2;
}
if (x + runlen > width)
cnt = width - x;
else
cnt = runlen;
draw_encoded_bitmap((ushort **)&fb,
cmap[bmap[1]], cnt);
}
x += runlen;
}
bmap += 2;
}
}
}
#endif
__weak void fb_put_byte(uchar **fb, uchar **from)
{
*(*fb)++ = *(*from)++;
}
#if defined(CONFIG_BMP_16BPP)
__weak void fb_put_word(uchar **fb, uchar **from)
{
*(*fb)++ = *(*from)++;
*(*fb)++ = *(*from)++;
}
#endif /* CONFIG_BMP_16BPP */
#define BMP_ALIGN_CENTER 0x7fff
/**
* video_splash_align_axis() - Align a single coordinate
*
*- if a coordinate is 0x7fff then the image will be centred in
* that direction
*- if a coordinate is -ve then it will be offset to the
* left/top of the centre by that many pixels
*- if a coordinate is positive it will be used unchnaged.
*
* @axis: Input and output coordinate
* @panel_size: Size of panel in pixels for that axis
* @picture_size: Size of bitmap in pixels for that axis
*/
static void video_splash_align_axis(int *axis, unsigned long panel_size,
unsigned long picture_size)
{
unsigned long panel_picture_delta = panel_size - picture_size;
unsigned long axis_alignment;
if (*axis == BMP_ALIGN_CENTER)
axis_alignment = panel_picture_delta / 2;
else if (*axis < 0)
axis_alignment = panel_picture_delta + *axis + 1;
else
return;
*axis = max(0, (int)axis_alignment);
}
static void video_set_cmap(struct udevice *dev,
struct bmp_color_table_entry *cte, unsigned colours)
{
struct video_priv *priv = dev_get_uclass_priv(dev);
int i;
ushort *cmap = priv->cmap;
debug("%s: colours=%d\n", __func__, colours);
for (i = 0; i < colours; ++i) {
*cmap = ((cte->red << 8) & 0xf800) |
((cte->green << 3) & 0x07e0) |
((cte->blue >> 3) & 0x001f);
cmap++;
cte++;
}
}
int video_bmp_display(struct udevice *dev, ulong bmp_image, int x, int y,
bool align)
{
struct video_priv *priv = dev_get_uclass_priv(dev);
ushort *cmap_base = NULL;
int i, j;
uchar *fb;
struct bmp_image *bmp = map_sysmem(bmp_image, 0);
uchar *bmap;
ushort padded_width;
unsigned long width, height, byte_width;
unsigned long pwidth = priv->xsize;
unsigned colours, bpix, bmp_bpix;
struct bmp_color_table_entry *palette;
int hdr_size;
if (!bmp || !(bmp->header.signature[0] == 'B' &&
bmp->header.signature[1] == 'M')) {
printf("Error: no valid bmp image at %lx\n", bmp_image);
return -EINVAL;
}
width = get_unaligned_le32(&bmp->header.width);
height = get_unaligned_le32(&bmp->header.height);
bmp_bpix = get_unaligned_le16(&bmp->header.bit_count);
hdr_size = get_unaligned_le16(&bmp->header.size);
debug("hdr_size=%d, bmp_bpix=%d\n", hdr_size, bmp_bpix);
palette = (void *)bmp + 14 + hdr_size;
colours = 1 << bmp_bpix;
bpix = VNBITS(priv->bpix);
if (bpix != 1 && bpix != 8 && bpix != 16 && bpix != 32) {
printf("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
bpix, bmp_bpix);
return -EINVAL;
}
/*
* We support displaying 8bpp BMPs on 16bpp LCDs
* and displaying 24bpp BMPs on 32bpp LCDs
* */
if (bpix != bmp_bpix &&
!(bmp_bpix == 8 && bpix == 16) &&
!(bmp_bpix == 24 && bpix == 32)) {
printf("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
bpix, get_unaligned_le16(&bmp->header.bit_count));
return -EPERM;
}
debug("Display-bmp: %d x %d with %d colours, display %d\n",
(int)width, (int)height, (int)colours, 1 << bpix);
if (bmp_bpix == 8)
video_set_cmap(dev, palette, colours);
padded_width = (width & 0x3 ? (width & ~0x3) + 4 : width);
if (align) {
video_splash_align_axis(&x, priv->xsize, width);
video_splash_align_axis(&y, priv->ysize, height);
}
if ((x + width) > pwidth)
width = pwidth - x;
if ((y + height) > priv->ysize)
height = priv->ysize - y;
bmap = (uchar *)bmp + get_unaligned_le32(&bmp->header.data_offset);
fb = (uchar *)(priv->fb +
(y + height - 1) * priv->line_length + x * bpix / 8);
switch (bmp_bpix) {
case 1:
case 8: {
cmap_base = priv->cmap;
#ifdef CONFIG_VIDEO_BMP_RLE8
u32 compression = get_unaligned_le32(&bmp->header.compression);
debug("compressed %d %d\n", compression, BMP_BI_RLE8);
if (compression == BMP_BI_RLE8) {
if (bpix != 16) {
/* TODO implement render code for bpix != 16 */
printf("Error: only support 16 bpix");
return -EPROTONOSUPPORT;
}
video_display_rle8_bitmap(dev, bmp, cmap_base, fb, x,
y);
break;
}
#endif
if (bpix != 16)
byte_width = width;
else
byte_width = width * 2;
for (i = 0; i < height; ++i) {
WATCHDOG_RESET();
for (j = 0; j < width; j++) {
if (bpix != 16) {
fb_put_byte(&fb, &bmap);
} else {
*(uint16_t *)fb = cmap_base[*bmap];
bmap++;
fb += sizeof(uint16_t) / sizeof(*fb);
}
}
bmap += (padded_width - width);
fb -= byte_width + priv->line_length;
}
break;
}
#if defined(CONFIG_BMP_16BPP)
case 16:
for (i = 0; i < height; ++i) {
WATCHDOG_RESET();
for (j = 0; j < width; j++)
fb_put_word(&fb, &bmap);
bmap += (padded_width - width) * 2;
fb -= width * 2 + priv->line_length;
}
break;
#endif /* CONFIG_BMP_16BPP */
#if defined(CONFIG_BMP_24BPP)
case 24:
for (i = 0; i < height; ++i) {
for (j = 0; j < width; j++) {
*(fb++) = *(bmap++);
*(fb++) = *(bmap++);
*(fb++) = *(bmap++);
*(fb++) = 0;
}
fb -= priv->line_length + width * (bpix / 8);
}
break;
#endif /* CONFIG_BMP_24BPP */
#if defined(CONFIG_BMP_32BPP)
case 32:
for (i = 0; i < height; ++i) {
for (j = 0; j < width; j++) {
*(fb++) = *(bmap++);
*(fb++) = *(bmap++);
*(fb++) = *(bmap++);
*(fb++) = *(bmap++);
}
fb -= priv->line_length + width * (bpix / 8);
}
break;
#endif /* CONFIG_BMP_32BPP */
default:
break;
};
video_sync(dev, false);
return 0;
}