u-boot/drivers/video/video_bmp.c
Janne Grunau 515a2f7c02 video: bmp: Support x2r10g10b10 pixel format
Fixes the display of the u-boot logo on Apple silicon devices.

Signed-off-by: Janne Grunau <j@jannau.net>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-03-09 21:23:57 +01:00

426 lines
10 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2015 Google, Inc
*/
#include <common.h>
#include <bmp_layout.h>
#include <dm.h>
#include <log.h>
#include <mapmem.h>
#include <splash.h>
#include <video.h>
#include <watchdog.h>
#include <asm/unaligned.h>
#define BMP_RLE8_ESCAPE 0
#define BMP_RLE8_EOL 0
#define BMP_RLE8_EOBMP 1
#define BMP_RLE8_DELTA 2
/**
* get_bmp_col_16bpp() - Convert a colour-table entry into a 16bpp pixel value
*
* Return: value to write to the 16bpp frame buffer for this palette entry
*/
static uint get_bmp_col_16bpp(struct bmp_color_table_entry cte)
{
return ((cte.red << 8) & 0xf800) |
((cte.green << 3) & 0x07e0) |
((cte.blue >> 3) & 0x001f);
}
/**
* get_bmp_col_x2r10g10b10() - Convert a colour-table entry into a x2r10g10b10 pixel value
*
* Return: value to write to the x2r10g10b10 frame buffer for this palette entry
*/
static u32 get_bmp_col_x2r10g10b10(struct bmp_color_table_entry *cte)
{
return ((cte->red << 22U) |
(cte->green << 12U) |
(cte->blue << 2U));
}
/**
* write_pix8() - Write a pixel from a BMP image into the framebuffer
*
* This handles frame buffers with 8, 16, 24 or 32 bits per pixel
*
* @fb: Place in frame buffer to update
* @bpix: Frame buffer bits-per-pixel, which controls how many bytes are written
* @palette: BMP palette table
* @bmap: Pointer to BMP bitmap position to write. This contains a single byte
* which is either written directly (bpix == 8) or used to look up the
* palette to get a colour to write
*/
static void write_pix8(u8 *fb, uint bpix, enum video_format eformat,
struct bmp_color_table_entry *palette, u8 *bmap)
{
if (bpix == 8) {
*fb++ = *bmap;
} else if (bpix == 16) {
*(u16 *)fb = get_bmp_col_16bpp(palette[*bmap]);
} else {
/* Only support big endian */
struct bmp_color_table_entry *cte = &palette[*bmap];
if (bpix == 24) {
*fb++ = cte->red;
*fb++ = cte->green;
*fb++ = cte->blue;
} else if (eformat == VIDEO_X2R10G10B10) {
*(u32 *)fb = get_bmp_col_x2r10g10b10(cte);
} else {
*fb++ = cte->blue;
*fb++ = cte->green;
*fb++ = cte->red;
*fb++ = 0;
}
}
}
static void draw_unencoded_bitmap(u8 **fbp, uint bpix,
enum video_format eformat, uchar *bmap,
struct bmp_color_table_entry *palette,
int cnt)
{
u8 *fb = *fbp;
while (cnt > 0) {
write_pix8(fb, bpix, eformat, palette, bmap++);
fb += bpix / 8;
cnt--;
}
*fbp = fb;
}
static void draw_encoded_bitmap(u8 **fbp, uint bpix, enum video_format eformat,
struct bmp_color_table_entry *palette, u8 *bmap,
int cnt)
{
u8 *fb = *fbp;
while (cnt > 0) {
write_pix8(fb, bpix, eformat, palette, bmap);
fb += bpix / 8;
cnt--;
}
*fbp = fb;
}
static void video_display_rle8_bitmap(struct udevice *dev,
struct bmp_image *bmp, uint bpix,
struct bmp_color_table_entry *palette,
uchar *fb, int x_off, int y_off,
ulong width, ulong height)
{
struct video_priv *priv = dev_get_uclass_priv(dev);
uchar *bmap;
ulong cnt, runlen;
int x, y;
int decode = 1;
uint bytes_per_pixel = bpix / 8;
enum video_format eformat = priv->format;
debug("%s\n", __func__);
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--;
fb -= width * bytes_per_pixel +
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];
fb = (uchar *)(priv->fb +
(y + y_off - 1) * priv->line_length +
(x + x_off) * bytes_per_pixel);
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(
&fb, bpix, eformat,
bmap, palette, 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(&fb, bpix, eformat,
palette, &bmap[1],
cnt);
}
x += runlen;
}
bmap += 2;
}
}
}
/**
* 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)
{
long panel_picture_delta = panel_size - picture_size;
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);
}
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);
int i, j;
uchar *start, *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;
enum video_format eformat;
struct bmp_color_table_entry *palette;
int hdr_size;
int ret;
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);
eformat = priv->format;
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 and 24bpp BMPs on 16bpp LCDs
* and displaying 24bpp BMPs on 32bpp LCDs
*/
if (bpix != bmp_bpix &&
!(bmp_bpix == 8 && bpix == 16) &&
!(bmp_bpix == 8 && bpix == 24) &&
!(bmp_bpix == 8 && bpix == 32) &&
!(bmp_bpix == 24 && 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);
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);
start = (uchar *)(priv->fb +
(y + height) * priv->line_length + x * bpix / 8);
/* Move back to the final line to be drawn */
fb = start - priv->line_length;
switch (bmp_bpix) {
case 1:
case 8:
if (IS_ENABLED(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) {
video_display_rle8_bitmap(dev, bmp, bpix, palette, fb,
x, y, width, height);
break;
}
}
/* Not compressed */
byte_width = width * (bpix / 8);
if (!byte_width)
byte_width = width;
for (i = 0; i < height; ++i) {
WATCHDOG_RESET();
for (j = 0; j < width; j++) {
write_pix8(fb, bpix, eformat, palette, bmap);
bmap++;
fb += bpix / 8;
}
bmap += (padded_width - width);
fb -= byte_width + priv->line_length;
}
break;
case 16:
if (IS_ENABLED(CONFIG_BMP_16BPP)) {
for (i = 0; i < height; ++i) {
WATCHDOG_RESET();
for (j = 0; j < width; j++) {
*fb++ = *bmap++;
*fb++ = *bmap++;
}
bmap += (padded_width - width);
fb -= width * 2 + priv->line_length;
}
}
break;
case 24:
if (IS_ENABLED(CONFIG_BMP_24BPP)) {
for (i = 0; i < height; ++i) {
for (j = 0; j < width; j++) {
if (bpix == 16) {
/* 16bit 565RGB format */
*(u16 *)fb = ((bmap[2] >> 3)
<< 11) |
((bmap[1] >> 2) << 5) |
(bmap[0] >> 3);
bmap += 3;
fb += 2;
} else if (eformat == VIDEO_X2R10G10B10) {
u32 pix;
pix = *bmap++ << 2U;
pix |= *bmap++ << 12U;
pix |= *bmap++ << 22U;
*fb++ = pix & 0xff;
*fb++ = (pix >> 8) & 0xff;
*fb++ = (pix >> 16) & 0xff;
*fb++ = pix >> 24;
} else {
*fb++ = *bmap++;
*fb++ = *bmap++;
*fb++ = *bmap++;
*fb++ = 0;
}
}
fb -= priv->line_length + width * (bpix / 8);
bmap += (padded_width - width);
}
}
break;
case 32:
if (IS_ENABLED(CONFIG_BMP_32BPP)) {
for (i = 0; i < height; ++i) {
for (j = 0; j < width; j++) {
if (eformat == VIDEO_X2R10G10B10) {
u32 pix;
pix = *bmap++ << 2U;
pix |= *bmap++ << 12U;
pix |= *bmap++ << 22U;
pix |= (*bmap++ >> 6) << 30U;
*fb++ = pix & 0xff;
*fb++ = (pix >> 8) & 0xff;
*fb++ = (pix >> 16) & 0xff;
*fb++ = pix >> 24;
} else {
*fb++ = *bmap++;
*fb++ = *bmap++;
*fb++ = *bmap++;
*fb++ = *bmap++;
}
}
fb -= priv->line_length + width * (bpix / 8);
}
}
break;
default:
break;
};
/* Find the position of the top left of the image in the framebuffer */
fb = (uchar *)(priv->fb + y * priv->line_length + x * bpix / 8);
ret = video_sync_copy(dev, start, fb);
if (ret)
return log_ret(ret);
return video_sync(dev, false);
}