--- /dev/null
+/*
+ * Copyright (c) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#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;
+ ushort 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 + lcd_line_length;
+ }
+ break;
+#endif /* CONFIG_BMP_16BPP */
+#if defined(CONFIG_BMP_24BMP)
+ case 24:
+ for (i = 0; i < height; ++i) {
+ for (j = 0; j < width; j++) {
+ *(fb++) = *(bmap++);
+ *(fb++) = *(bmap++);
+ *(fb++) = *(bmap++);
+ *(fb++) = 0;
+ }
+ fb -= lcd_line_length + width * (bpix / 8);
+ }
+ break;
+#endif /* CONFIG_BMP_24BMP */
+#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 -= lcd_line_length + width * (bpix / 8);
+ }
+ break;
+#endif /* CONFIG_BMP_32BPP */
+ default:
+ break;
+ };
+
+ video_sync(dev);
+
+ return 0;
+}
+
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