From 418169aff8faf2cf90124cd95dba0af821cea73d Mon Sep 17 00:00:00 2001
From: Solomon Peachy <pizza@shaftnet.org>
Date: Thu, 13 Oct 2022 11:03:53 -0400
Subject: Revert "Remove YUV blitting functions and LCD modes"

This reverts commit fe6aa21e9eb88f49005863efd2003d0982920048.

Change-Id: I8bb1e5d6c52ed1478002d2140ef494ec5d62b8e3
---
 firmware/target/arm/pbell/vibe500/lcd-vibe500.c | 75 +++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

(limited to 'firmware/target/arm/pbell/vibe500/lcd-vibe500.c')

diff --git a/firmware/target/arm/pbell/vibe500/lcd-vibe500.c b/firmware/target/arm/pbell/vibe500/lcd-vibe500.c
index 2daa5def74..047ef2bf53 100644
--- a/firmware/target/arm/pbell/vibe500/lcd-vibe500.c
+++ b/firmware/target/arm/pbell/vibe500/lcd-vibe500.c
@@ -35,6 +35,8 @@ static unsigned short disp_control_rev;
 /* Contrast setting << 8 */
 static int lcd_contrast;
 
+static unsigned lcd_yuv_options SHAREDBSS_ATTR = 0;
+
 /* Forward declarations */
 #if defined(HAVE_LCD_ENABLE) || defined(HAVE_LCD_SLEEP)
 static void lcd_display_off(void);
@@ -375,6 +377,79 @@ bool lcd_active(void)
 
 /*** update functions ***/
 
+void lcd_yuv_set_options(unsigned options)
+{
+    lcd_yuv_options = options;
+}
+
+/* Line write helper function for lcd_yuv_blit. Write two lines of yuv420. */
+
+extern void lcd_write_yuv420_lines(unsigned char const * const src[3],
+                                   int width,
+                                   int stride);
+extern void lcd_write_yuv420_lines_odither(unsigned char const * const src[3],
+                                           int width,
+                                           int stride,
+                                           int x_screen, /* To align dither pattern */
+                                           int y_screen);
+
+/* Performance function to blit a YUV bitmap directly to the LCD */
+void lcd_blit_yuv(unsigned char * const src[3],
+                  int src_x, int src_y, int stride,
+                  int x, int y, int width, int height)
+{
+    const unsigned char *yuv_src[3];
+    const unsigned char *ysrc_max;
+    int y0;
+    int options;
+
+    if (!display_on)
+        return;
+
+    width &= ~1;
+    height &= ~1;
+
+    lcd_write_reg(R_VERT_RAM_ADDR_POS, ((LCD_WIDTH - 1 - x) << 8) |
+    ((LCD_WIDTH-1) - (x + width - 1)));
+
+    y0 = LCD_HEIGHT - 1 - y;
+
+    lcd_write_reg(R_ENTRY_MODE,0x1000);
+
+    yuv_src[0] = src[0] + src_y * stride + src_x;
+    yuv_src[1] = src[1] + (src_y * stride >> 2) + (src_x >> 1);
+    yuv_src[2] = src[2] + (yuv_src[1] - src[1]);
+    ysrc_max = yuv_src[0] + height * stride;
+
+    options = lcd_yuv_options;
+
+    do
+    {
+        lcd_write_reg(R_HORIZ_RAM_ADDR_POS, (y0 << 8) | (y0 - 1));
+        lcd_write_reg(R_RAM_ADDR_SET, ((LCD_WIDTH - 1 - x) << 8) | y0);
+
+        /* start drawing */
+        lcd_send_cmd(R_WRITE_DATA_2_GRAM);
+
+        if (options & LCD_YUV_DITHER)
+        {
+            lcd_write_yuv420_lines_odither(yuv_src, width, stride,x, y);
+            y -= 2;
+        }
+        else
+        {
+            lcd_write_yuv420_lines(yuv_src, width, stride);
+        }
+
+        y0 -= 2;
+        yuv_src[0] += stride << 1;
+        yuv_src[1] += stride >> 1;
+        yuv_src[2] += stride >> 1;
+    }
+    while (yuv_src[0] < ysrc_max);
+    lcd_write_reg(R_ENTRY_MODE,0x1008);
+}
+
 /* Update a fraction of the display. */
 void lcd_update_rect(int x0, int y0, int width, int height)
 {
-- 
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