static grub_err_t
grub_video_bitmap_scale (struct grub_video_bitmap *dst,
struct grub_video_bitmap *src,
enum grub_video_bitmap_scale_method scale_method)
{
switch (scale_method)
{
case GRUB_VIDEO_BITMAP_SCALE_METHOD_FASTEST:
case GRUB_VIDEO_BITMAP_SCALE_METHOD_NEAREST:
return scale_nn (dst, src);
case GRUB_VIDEO_BITMAP_SCALE_METHOD_BEST:
case GRUB_VIDEO_BITMAP_SCALE_METHOD_BILINEAR:
return scale_bilinear (dst, src);
default:
return grub_error (GRUB_ERR_BUG, "Invalid scale_method value");
}
}
/* This function creates a new scaled version of the bitmap SRC. The new
bitmap has dimensions DST_WIDTH by DST_HEIGHT. The scaling algorithm
is given by SCALE_METHOD. If an error is encountered, the return code is
not equal to GRUB_ERR_NONE, and the bitmap DST is either not created, or
it is destroyed before this function returns.
Supports only direct color modes which have components separated
into bytes (e.g., RGBA 8:8:8:8 or BGR 8:8:8 true color).
But because of this simplifying assumption, the implementation is
greatly simplified. */
static grub_err_t
grub_video_bitmap_create_scaled_internal (struct grub_video_bitmap **dst,
int dst_width, int dst_height,
struct grub_video_bitmap *src,
int scale_method)
{
/* Create the new bitmap. */
grub_err_t ret;
ret = grub_video_bitmap_create (dst, dst_width, dst_height,
src->mode_info.blit_format);
if (ret != GRUB_ERR_NONE)
return ret; /* Error. */
(*dst)->transparent = src->transparent;
switch (scale_method)
{
case GRUB_VIDEO_BITMAP_SCALE_METHOD_FASTEST:
case GRUB_VIDEO_BITMAP_SCALE_METHOD_NEAREST:
ret = scale_nn (*dst, src);
break;
case GRUB_VIDEO_BITMAP_SCALE_METHOD_BEST:
case GRUB_VIDEO_BITMAP_SCALE_METHOD_BILINEAR:
ret = scale_bilinear (*dst, src);
break;
default:
ret = grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid scale method value");
break;
}
if (ret == GRUB_ERR_NONE)
{
/* Success: *dst is now a pointer to the scaled bitmap. */
return GRUB_ERR_NONE;
}
else
{
/* Destroy the bitmap and return the error code. */
grub_video_bitmap_destroy (*dst);
*dst = 0;
return ret;
}
}
/* This function creates a new scaled version of the bitmap SRC. The new
bitmap has dimensions DST_WIDTH by DST_HEIGHT. The scaling algorithm
is given by SCALE_METHOD. If an error is encountered, the return code is
not equal to GRUB_ERR_NONE, and the bitmap DST is either not created, or
it is destroyed before this function returns.
Supports only direct color modes which have components separated
into bytes (e.g., RGBA 8:8:8:8 or BGR 8:8:8 true color).
But because of this simplifying assumption, the implementation is
greatly simplified. */
grub_err_t
grub_video_bitmap_create_scaled (struct grub_video_bitmap **dst,
int dst_width, int dst_height,
struct grub_video_bitmap *src,
enum grub_video_bitmap_scale_method
scale_method)
{
*dst = 0;
/* Verify the simplifying assumptions. */
if (src == 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"null src bitmap in grub_video_bitmap_create_scaled");
if (src->mode_info.red_field_pos % 8 != 0
|| src->mode_info.green_field_pos % 8 != 0
|| src->mode_info.blue_field_pos % 8 != 0
|| src->mode_info.reserved_field_pos % 8 != 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"src format not supported for scale");
if (src->mode_info.width == 0 || src->mode_info.height == 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"source bitmap has a zero dimension");
if (dst_width <= 0 || dst_height <= 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"requested to scale to a size w/ a zero dimension");
if (src->mode_info.bytes_per_pixel * 8 != src->mode_info.bpp)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"bitmap to scale has inconsistent Bpp and bpp");
/* Create the new bitmap. */
grub_err_t ret;
ret = grub_video_bitmap_create (dst, dst_width, dst_height,
src->mode_info.blit_format);
if (ret != GRUB_ERR_NONE)
return ret; /* Error. */
switch (scale_method)
{
case GRUB_VIDEO_BITMAP_SCALE_METHOD_FASTEST:
case GRUB_VIDEO_BITMAP_SCALE_METHOD_NEAREST:
ret = scale_nn (*dst, src);
break;
case GRUB_VIDEO_BITMAP_SCALE_METHOD_BEST:
case GRUB_VIDEO_BITMAP_SCALE_METHOD_BILINEAR:
ret = scale_bilinear (*dst, src);
break;
default:
ret = grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid scale_method value");
break;
}
if (ret == GRUB_ERR_NONE)
{
/* Success: *dst is now a pointer to the scaled bitmap. */
return GRUB_ERR_NONE;
}
else
{
/* Destroy the bitmap and return the error code. */
grub_video_bitmap_destroy (*dst);
*dst = 0;
return ret;
}
}
