1 files changed, 151 insertions, 0 deletions
diff --git a/grub-core/video/fb/fbutil.c b/grub-core/video/fb/fbutil.c
new file mode 100644
index 0000000..b98bb51
--- /dev/null
+++ b/grub-core/video/fb/fbutil.c
@@ -0,0 +1,151 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2006,2007,2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* SPECIAL NOTES!
+
+   Please note following when reading the code below:
+
+   - In this driver we assume that every memory can be accessed by same memory
+     bus.  If there are different address spaces do not use this code as a base
+     code for other archs.
+
+   - Every function in this code assumes that bounds checking has been done in
+     previous phase and they are opted out in here.  */
+
+#include <grub/fbutil.h>
+#include <grub/types.h>
+#include <grub/video.h>
+
+grub_video_color_t
+get_pixel (struct grub_video_fbblit_info *source,
+           unsigned int x, unsigned int y)
+{
+  grub_video_color_t color = 0;
+
+  switch (source->mode_info->bpp)
+    {
+    case 32:
+      color = *(grub_uint32_t *)grub_video_fb_get_video_ptr (source, x, y);
+      break;
+
+    case 24:
+      {
+        grub_uint8_t *ptr;
+        ptr = grub_video_fb_get_video_ptr (source, x, y);
+#ifdef GRUB_CPU_WORDS_BIGENDIAN
+        color = ptr[2] | (ptr[1] << 8) | (ptr[0] << 16);
+#else
+        color = ptr[0] | (ptr[1] << 8) | (ptr[2] << 16);
+#endif
+      }
+      break;
+
+    case 16:
+    case 15:
+      color = *(grub_uint16_t *)grub_video_fb_get_video_ptr (source, x, y);
+      break;
+
+    case 8:
+      color = *(grub_uint8_t *)grub_video_fb_get_video_ptr (source, x, y);
+      break;
+
+    case 1:
+      if (source->mode_info->blit_format == GRUB_VIDEO_BLIT_FORMAT_1BIT_PACKED)
+        {
+          int bit_index = y * source->mode_info->width + x;
+          grub_uint8_t *ptr = source->data + bit_index / 8;
+          int bit_pos = 7 - bit_index % 8;
+          color = (*ptr >> bit_pos) & 0x01;
+        }
+      break;
+
+    default:
+      break;
+    }
+
+  return color;
+}
+
+void
+set_pixel (struct grub_video_fbblit_info *source,
+           unsigned int x, unsigned int y, grub_video_color_t color)
+{
+  switch (source->mode_info->bpp)
+    {
+    case 32:
+      {
+        grub_uint32_t *ptr;
+
+        ptr = (grub_uint32_t *)grub_video_fb_get_video_ptr (source, x, y);
+
+        *ptr = color;
+      }
+      break;
+
+    case 24:
+      {
+        grub_uint8_t *ptr;
+#ifdef GRUB_CPU_WORDS_BIGENDIAN
+        grub_uint8_t *colorptr = ((grub_uint8_t *)&color) + 1;
+#else
+        grub_uint8_t *colorptr = (grub_uint8_t *)&color;
+#endif
+
+        ptr = grub_video_fb_get_video_ptr (source, x, y);
+
+        ptr[0] = colorptr[0];
+        ptr[1] = colorptr[1];
+        ptr[2] = colorptr[2];
+      }
+      break;
+
+    case 16:
+    case 15:
+      {
+        grub_uint16_t *ptr;
+
+        ptr = (grub_uint16_t *)grub_video_fb_get_video_ptr (source, x, y);
+
+        *ptr = (grub_uint16_t) (color & 0xFFFF);
+      }
+      break;
+
+    case 8:
+      {
+        grub_uint8_t *ptr;
+
+        ptr = (grub_uint8_t *)grub_video_fb_get_video_ptr (source, x, y);
+
+        *ptr = (grub_uint8_t) (color & 0xFF);
+      }
+      break;
+
+    case 1:
+      if (source->mode_info->blit_format == GRUB_VIDEO_BLIT_FORMAT_1BIT_PACKED)
+        {
+          int bit_index = y * source->mode_info->width + x;
+          grub_uint8_t *ptr = source->data + bit_index / 8;
+          int bit_pos = 7 - bit_index % 8;
+          *ptr = (*ptr & ~(1 << bit_pos)) | ((color & 0x01) << bit_pos);
+        }
+      break;
+
+    default:
+      break;
+    }
+}