xenocara/lib/xcb-util-image/image/xcb_pixel.h
2014-04-14 19:29:32 +00:00

172 lines
5.0 KiB
C

#ifndef __XCB_PIXEL_H__
#define __XCB_PIXEL_H__
/* Copyright (C) 2007 Bart Massey
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the names of the authors or their
* institutions shall not be used in advertising or otherwise to promote the
* sale, use or other dealings in this Software without prior written
* authorization from the authors.
*/
#include <inttypes.h>
#include <X11/Xfuncproto.h>
#ifndef BUILD
#include <xcb/xcb_bitops.h>
#include <xcb/xcb_image.h>
#endif
/**
* XCB Image fast pixel ops.
*
* Fast inline versions of xcb_image_get_pixel() and
* xcb_image_put_pixel() for various common cases.
* The naming convention is xcb_image_put_pixel_FUB()
* where F is the format and is either XY for bitmaps
* or Z for pixmaps, U is the bitmap unit size or pixmap
* bits-per-pixel, and B is the endianness (if needed)
* and is either M for most-significant-first or L for
* least-significant-first. Note that no checking
* is done on the arguments to these routines---caller beware.
* Also note that the pixel type is chosen to be appropriate
* to the unit; bitmaps use int and pixmaps use the appropriate
* size of unsigned.
* @ingroup xcb__image_t
*/
_X_INLINE static void
xcb_image_put_pixel_XY32M (xcb_image_t *image,
uint32_t x,
uint32_t y,
int pixel)
{
uint32_t unit = (x >> 3) & ~xcb_mask(2);
uint32_t byte = xcb_mask(2) - ((x >> 3) & xcb_mask(2));
uint32_t bit = xcb_mask(3) - (x & xcb_mask(3));
uint8_t m = 1 << bit;
uint8_t p = pixel << bit;
uint8_t * bp = image->data + (y * image->stride) + (unit | byte);
*bp = (*bp & ~m) | p;
}
_X_INLINE static void
xcb_image_put_pixel_XY32L (xcb_image_t *image,
uint32_t x,
uint32_t y,
int pixel)
{
uint32_t bit = x & xcb_mask(3);
uint8_t m = 1 << bit;
uint8_t p = pixel << bit;
uint8_t * bp = image->data + (y * image->stride) + (x >> 3);
*bp = (*bp & ~m) | p;
}
_X_INLINE static int
xcb_image_get_pixel_XY32M (xcb_image_t *image,
uint32_t x,
uint32_t y)
{
uint32_t unit = (x >> 3) & ~xcb_mask(2);
uint32_t byte = xcb_mask(2) - ((x >> 3) & xcb_mask(2));
uint32_t bit = xcb_mask(3) - (x & xcb_mask(3));
uint8_t * bp = image->data + (y * image->stride) + (unit | byte);
return (*bp >> bit) & 1;
}
_X_INLINE static int
xcb_image_get_pixel_XY32L (xcb_image_t *image,
uint32_t x,
uint32_t y)
{
uint32_t bit = x & xcb_mask(3);
uint8_t * bp = image->data + (y * image->stride) + (x >> 3);
return (*bp >> bit) & 1;
}
_X_INLINE static void
xcb_image_put_pixel_Z8 (xcb_image_t *image,
uint32_t x,
uint32_t y,
uint8_t pixel)
{
image->data[x + y * image->stride] = pixel;
}
_X_INLINE static uint8_t
xcb_image_get_pixel_Z8 (xcb_image_t *image,
uint32_t x,
uint32_t y)
{
return image->data[x + y * image->stride];
}
_X_INLINE static void
xcb_image_put_pixel_Z32M (xcb_image_t *image,
uint32_t x,
uint32_t y,
uint32_t pixel)
{
uint8_t * row = image->data + (y * image->stride);
row[x << 2] = pixel >> 24;
row[(x << 2) + 1] = pixel >> 16;
row[(x << 2) + 2] = pixel >> 8;
row[(x << 2) + 3] = pixel;
}
_X_INLINE static void
xcb_image_put_pixel_Z32L (xcb_image_t *image,
uint32_t x,
uint32_t y,
uint32_t pixel)
{
uint8_t * row = image->data + (y * image->stride);
row[x << 2] = pixel;
row[(x << 2) + 1] = pixel >> 8;
row[(x << 2) + 2] = pixel >> 16;
row[(x << 2) + 3] = pixel >> 24;
}
_X_INLINE static uint32_t
xcb_image_get_pixel_Z32M (xcb_image_t *image,
uint32_t x,
uint32_t y)
{
uint8_t * row = image->data + (y * image->stride);
uint32_t pixel = row[x << 2] << 24;
pixel |= row[(x << 2) + 1] << 16;
pixel |= row[(x << 2) + 2] << 8;
return pixel | row[(x << 2) + 3];
}
_X_INLINE static uint32_t
xcb_image_get_pixel_Z32L (xcb_image_t *image,
uint32_t x,
uint32_t y)
{
uint8_t * row = image->data + (y * image->stride);
uint32_t pixel = row[x << 2];
pixel |= row[(x << 2) + 1] << 8;
pixel |= row[(x << 2) + 2] << 16;
return pixel | row[(x << 2) + 3] << 24;
}
#endif /* __XCB_PIXEL_H__ */