drivers/video/video_bmp.c - filogic/uboot - Gitiles

 // 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);
 }

 /**
  * 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, 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 {
 			*fb++ = cte->blue;
 			*fb++ = cte->green;
 			*fb++ = cte->red;
 			*fb++ = 0;
 		}
 	}
 }

 static void draw_unencoded_bitmap(u8 **fbp, uint bpix, uchar *bmap,
 				  struct bmp_color_table_entry *palette,
 				  int cnt)
 {
 	u8 *fb = *fbp;

 	while (cnt > 0) {
 		write_pix8(fb, bpix, palette, bmap++);
 		fb += bpix / 8;
 		cnt--;
 	}
 	*fbp = fb;
 }

 static void draw_encoded_bitmap(u8 **fbp, uint bpix,
 				struct bmp_color_table_entry *palette, u8 *bmap,
 				int cnt)
 {
 	u8 *fb = *fbp;

 	while (cnt > 0) {
 		write_pix8(fb, bpix, 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;

 	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,
 							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, 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;
 	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);

 	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, 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 {
 						*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++) {
 					*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);
 }
	// 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);
	}

	/**
	* 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, 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 {
	*fb++ = cte->blue;
	*fb++ = cte->green;
	*fb++ = cte->red;
	*fb++ = 0;
	}
	}
	}

	static void draw_unencoded_bitmap(u8 *fbp, uint bpix, uchar bmap,
	struct bmp_color_table_entry *palette,
	int cnt)
	{
	u8 fb = fbp;

	while (cnt > 0) {
	write_pix8(fb, bpix, palette, bmap++);
	fb += bpix / 8;
	cnt--;
	}
	*fbp = fb;
	}

	static void draw_encoded_bitmap(u8 **fbp, uint bpix,
	struct bmp_color_table_entry palette, u8 bmap,
	int cnt)
	{
	u8 fb = fbp;

	while (cnt > 0) {
	write_pix8(fb, bpix, 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;

	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,
	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, 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;
	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);

	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, 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 {
	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++) {
	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);
	}