drivers/video/video_bmp.c - u-boot - Git at Google

 // 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);

 	return 0;
 }
	// 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);

	return 0;
	}