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Check for truecolor in a more direct way

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This commit is contained in:
Ray Strode 2008-06-10 14:11:29 -04:00
parent 1d30484098
commit 321a08fc0f
1 changed files with 14 additions and 6 deletions
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20
src/libply/ply-frame-buffer.c
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@ -233,12 +233,6 @@ ply_frame_buffer_query_device (ply_frame_buffer_t *buffer)
buffer->alpha_bit_position = variable_screen_info.transp.offset;
buffer->bits_for_alpha = variable_screen_info.transp.length;
/* Normally the pixel is divided between the color components.
* If we have less bits per pixel than bits per color component,
* then we know we aren't using a direct color mapping. Instead
* we must be using an indexed palette and a pseudocolor mode, which
* we don't support.
*/
if (variable_screen_info.bits_per_pixel <
buffer->bits_for_red + buffer->bits_for_green + buffer->bits_for_blue)
{
@ -251,6 +245,20 @@ ply_frame_buffer_query_device (ply_frame_buffer_t *buffer)
return false;
}
/* Normally the pixel is divided into channels between the color components.
* Each channel directly maps to a color channel on the hardware.
*
* There are some odd ball modes that use an indexed palette instead. In
* those cases (pseudocolor, direct color, etc), the pixel value is just an
* index into a lookup table of the real color values.
*
* We don't support that.
*/
if (fixed_screen_info.visual != FB_VISUAL_TRUECOLOR)
{
return false;
}
buffer->bytes_per_pixel = variable_screen_info.bits_per_pixel >> 3;
buffer->row_stride = fixed_screen_info.line_length / buffer->bytes_per_pixel;
buffer->size = buffer->area.height * buffer->row_stride * buffer->bytes_per_pixel;