From fbdb2457d6d410f5c086f865f1745fc90b429180 Mon Sep 17 00:00:00 2001
From: kugel <kugel@a1c6a512-1295-4272-9138-f99709370657>
Date: Sat, 5 Mar 2011 20:09:41 +0000
Subject: [PATCH] Add viewport clipping to lcd_alpha_bitmap_part as
 lcd_mono_bitmap_part also has.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29526 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/lcd-16bit-vert.c | 37 ++++++++++++++++++++++++++++++++++---
 firmware/drivers/lcd-16bit.c      | 32 +++++++++++++++++++++++++++++++-
 2 files changed, 65 insertions(+), 4 deletions(-)

diff --git a/firmware/drivers/lcd-16bit-vert.c b/firmware/drivers/lcd-16bit-vert.c
index 87a49e1249..552d80c5aa 100644
--- a/firmware/drivers/lcd-16bit-vert.c
+++ b/firmware/drivers/lcd-16bit-vert.c
@@ -998,6 +998,7 @@ void ICODE_ATTR lcd_alpha_bitmap_part(const unsigned char *src, int src_x,
     if (y + height > current_vp->height)
         height = current_vp->height - y;
 
+    
     if (drmode & DRMODE_INVERSEVID)
     {
         dmask = 0xffffffff;
@@ -1008,7 +1009,37 @@ void ICODE_ATTR lcd_alpha_bitmap_part(const unsigned char *src, int src_x,
         dmask = ~dmask;
     }
 
-    dst_row = dst = LCDADDR(current_vp->x + x, current_vp->y + y);
+    /* adjust for viewport */
+    x += current_vp->x;
+    y += current_vp->y;
+
+#if defined(HAVE_VIEWPORT_CLIP)
+    /********************* Viewport on screen clipping ********************/
+    /* nothing to draw? */
+    if ((x >= LCD_WIDTH) || (y >= LCD_HEIGHT) 
+        || (x + width <= 0) || (y + height <= 0))
+        return;
+    
+    /* clip image in viewport in screen */
+    if (x < 0)
+    {
+        width += x;
+        src_x -= x;
+        x = 0;
+    }
+    if (y < 0)
+    {
+        height += y;
+        src_y -= y;
+        y = 0;
+    }
+    if (x + width > LCD_WIDTH)
+        width = LCD_WIDTH - x;
+    if (y + height > LCD_HEIGHT)
+        height = LCD_HEIGHT - y;
+#endif
+
+    dst_row = dst = LCDADDR(x, y);
     
 
     int col, row = height;
@@ -1035,8 +1066,8 @@ void ICODE_ATTR lcd_alpha_bitmap_part(const unsigned char *src, int src_x,
     do
     {
         col = width;
-        dst = dst_row;
-        dst_row++;
+        dst = dst_row++;
+
 #ifdef ALPHA_BITMAP_READ_WORDS
 #define UPDATE_SRC_ALPHA    do { \
             if (--pixels) \
diff --git a/firmware/drivers/lcd-16bit.c b/firmware/drivers/lcd-16bit.c
index a2eb3e630c..2017a7e5ab 100644
--- a/firmware/drivers/lcd-16bit.c
+++ b/firmware/drivers/lcd-16bit.c
@@ -989,6 +989,36 @@ void ICODE_ATTR lcd_alpha_bitmap_part(const unsigned char *src, int src_x,
     if (y + height > current_vp->height)
         height = current_vp->height - y;
 
+    /* adjust for viewport */
+    x += current_vp->x;
+    y += current_vp->y;
+
+#if defined(HAVE_VIEWPORT_CLIP)
+    /********************* Viewport on screen clipping ********************/
+    /* nothing to draw? */
+    if ((x >= LCD_WIDTH) || (y >= LCD_HEIGHT) 
+        || (x + width <= 0) || (y + height <= 0))
+        return;
+    
+    /* clip image in viewport in screen */
+    if (x < 0)
+    {
+        width += x;
+        src_x -= x;
+        x = 0;
+    }
+    if (y < 0)
+    {
+        height += y;
+        src_y -= y;
+        y = 0;
+    }
+    if (x + width > LCD_WIDTH)
+        width = LCD_WIDTH - x;
+    if (y + height > LCD_HEIGHT)
+        height = LCD_HEIGHT - y;
+#endif
+
     if (drmode & DRMODE_INVERSEVID)
     {
         dmask = 0xffffffff;
@@ -999,7 +1029,7 @@ void ICODE_ATTR lcd_alpha_bitmap_part(const unsigned char *src, int src_x,
         dmask = ~dmask;
     }
 
-    dst = LCDADDR(current_vp->x + x, current_vp->y + y);
+    dst = LCDADDR(x, y);
 
     int col, row = height;
     unsigned data, pixels;
-- 
2.11.4.GIT