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xenocara/dist/xcb-util/image/xcb_image.c
matthieu f4c2f8c818 import xcb-util 0.3.4
2009-05-23 14:37:52 +00:00

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/* Copyright © 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <xcb/xcb.h>
#include <xcb/shm.h>
#include "../aux/xcb_aux.h"
#include "../aux/xcb_bitops.h"
#include "xcb_image.h"
#define BUILD
#include "xcb_pixel.h"
static xcb_format_t *
find_format_by_depth (const xcb_setup_t *setup, uint8_t depth)
{
xcb_format_t *fmt = xcb_setup_pixmap_formats(setup);
xcb_format_t *fmtend = fmt + xcb_setup_pixmap_formats_length(setup);
for(; fmt != fmtend; ++fmt)
if(fmt->depth == depth)
return fmt;
return 0;
}
static xcb_image_format_t
effective_format(xcb_image_format_t format, uint8_t bpp)
{
if (format == XCB_IMAGE_FORMAT_Z_PIXMAP && bpp != 1)
return format;
return XCB_IMAGE_FORMAT_XY_PIXMAP;
}
static int
format_valid (uint8_t depth, uint8_t bpp, uint8_t unit,
xcb_image_format_t format, uint8_t xpad)
{
xcb_image_format_t ef = effective_format(format, bpp);
if (depth > bpp)
return 0;
switch(ef) {
case XCB_IMAGE_FORMAT_XY_PIXMAP:
switch(unit) {
case 8:
case 16:
case 32:
break;
default:
return 0;
}
if (xpad < bpp)
return 0;
switch (xpad) {
case 8:
case 16:
case 32:
break;
default:
return 0;
}
break;
case XCB_IMAGE_FORMAT_Z_PIXMAP:
switch (bpp) {
case 4:
if (unit != 8)
return 0;
break;
case 8:
case 16:
case 24:
case 32:
if (unit != bpp)
return 0;
break;
default:
return 0;
}
break;
default:
return 0;
}
return 1;
}
static int
image_format_valid (xcb_image_t *image) {
return format_valid(image->depth,
image->bpp,
image->unit,
image->format,
image->scanline_pad);
}
void
xcb_image_annotate (xcb_image_t *image)
{
xcb_image_format_t ef = effective_format(image->format, image->bpp);
switch (ef) {
case XCB_IMAGE_FORMAT_XY_PIXMAP:
image->stride = xcb_roundup(image->width, image->scanline_pad) >> 3;
image->size = image->height * image->stride * image->depth;
break;
case XCB_IMAGE_FORMAT_Z_PIXMAP:
image->stride = xcb_roundup((uint32_t)image->width *
(uint32_t)image->bpp,
image->scanline_pad) >> 3;
image->size = image->height * image->stride;
break;
default:
assert(0);
}
}
xcb_image_t *
xcb_image_create_native (xcb_connection_t * c,
uint16_t width,
uint16_t height,
xcb_image_format_t format,
uint8_t depth,
void * base,
uint32_t bytes,
uint8_t * data)
{
const xcb_setup_t * setup = xcb_get_setup(c);
xcb_format_t * fmt;
xcb_image_format_t ef = format;
if (ef == XCB_IMAGE_FORMAT_Z_PIXMAP && depth == 1)
ef = XCB_IMAGE_FORMAT_XY_PIXMAP;
switch (ef) {
case XCB_IMAGE_FORMAT_XY_BITMAP:
if (depth != 1)
return 0;
/* fall through */
case XCB_IMAGE_FORMAT_XY_PIXMAP:
if (depth > 1) {
fmt = find_format_by_depth(setup, depth);
if (!fmt)
return 0;
}
return xcb_image_create(width, height, format,
setup->bitmap_format_scanline_pad,
depth, depth, setup->bitmap_format_scanline_unit,
setup->image_byte_order,
setup->bitmap_format_bit_order,
base, bytes, data);
case XCB_IMAGE_FORMAT_Z_PIXMAP:
fmt = find_format_by_depth(setup, depth);
if (!fmt)
return 0;
return xcb_image_create(width, height, format,
fmt->scanline_pad,
fmt->depth, fmt->bits_per_pixel, 0,
setup->image_byte_order,
XCB_IMAGE_ORDER_MSB_FIRST,
base, bytes, data);
default:
assert(0);
}
assert(0);
}
xcb_image_t *
xcb_image_create (uint16_t width,
uint16_t height,
xcb_image_format_t format,
uint8_t xpad,
uint8_t depth,
uint8_t bpp,
uint8_t unit,
xcb_image_order_t byte_order,
xcb_image_order_t bit_order,
void * base,
uint32_t bytes,
uint8_t * data)
{
xcb_image_t * image;
if (unit == 0) {
switch (format) {
case XCB_IMAGE_FORMAT_XY_BITMAP:
case XCB_IMAGE_FORMAT_XY_PIXMAP:
unit = 32;
break;
case XCB_IMAGE_FORMAT_Z_PIXMAP:
if (bpp == 1) {
unit = 32;
break;
}
if (bpp < 8) {
unit = 8;
break;
}
unit = bpp;
break;
}
}
if (!format_valid(depth, bpp, unit, format, xpad))
return 0;
image = malloc(sizeof(*image));
if (image == 0)
return 0;
image->width = width;
image->height = height;
image->format = format;
image->scanline_pad = xpad;
image->depth = depth;
image->bpp = bpp;
image->unit = unit;
image->plane_mask = xcb_mask(depth);
image->byte_order = byte_order;
image->bit_order = bit_order;
xcb_image_annotate(image);
/*
* Ways this function can be called:
* * with data: we fail if bytes isn't
* large enough, else leave well enough alone.
* * with base and !data: if bytes is zero, we
* default; otherwise we fail if bytes isn't
* large enough, else fill in data
* * with !base and !data: we malloc storage
* for the data, save that address as the base,
* and fail if malloc does.
*
* When successful, we establish the invariant that data
* points at sufficient storage that may have been
* supplied, and base is set iff it should be
* auto-freed when the image is destroyed.
*
* Except as a special case when base = 0 && data == 0 &&
* bytes == ~0 we just return the image structure and let
* the caller deal with getting the allocation right.
*/
if (!base && !data && bytes == ~0) {
image->base = 0;
image->data = 0;
return image;
}
if (!base && data && bytes == 0)
bytes = image->size;
image->base = base;
image->data = data;
if (!image->data) {
if (image->base) {
image->data = image->base;
} else {
bytes = image->size;
image->base = malloc(bytes);
image->data = image->base;
}
}
if (!image->data || bytes < image->size) {
free(image);
return 0;
}
return image;
}
void
xcb_image_destroy (xcb_image_t *image)
{
if (image->base)
free (image->base);
free (image);
}
xcb_image_t *
xcb_image_get (xcb_connection_t * conn,
xcb_drawable_t draw,
int16_t x,
int16_t y,
uint16_t width,
uint16_t height,
uint32_t plane_mask,
xcb_image_format_t format)
{
xcb_get_image_cookie_t image_cookie;
xcb_get_image_reply_t * imrep;
xcb_image_t * image = 0;
uint32_t bytes;
uint8_t * data;
image_cookie = xcb_get_image(conn, format, draw, x, y,
width, height, plane_mask);
imrep = xcb_get_image_reply(conn, image_cookie, 0);
if (!imrep)
return 0;
bytes = xcb_get_image_data_length(imrep);
data = xcb_get_image_data(imrep);
switch (format) {
case XCB_IMAGE_FORMAT_XY_PIXMAP:
plane_mask &= xcb_mask(imrep->depth);
if (plane_mask != xcb_mask(imrep->depth)) {
xcb_image_t * tmp_image =
xcb_image_create_native(conn, width, height, format,
imrep->depth, 0, 0, 0);
int i;
uint32_t rpm = plane_mask;
uint8_t * src_plane = image->data;
uint8_t * dst_plane = tmp_image->data;
uint32_t size = image->height * image->stride;
if (!tmp_image) {
free(imrep);
return 0;
}
if (tmp_image->bit_order == XCB_IMAGE_ORDER_MSB_FIRST)
rpm = xcb_bit_reverse(plane_mask, imrep->depth);
for (i = 0; i < imrep->depth; i++) {
if (rpm & 1) {
memcpy(dst_plane, src_plane, size);
src_plane += size;
} else {
memset(dst_plane, 0, size);
}
dst_plane += size;
}
tmp_image->plane_mask = plane_mask;
image = tmp_image;
free(imrep);
break;
}
/* fall through */
case XCB_IMAGE_FORMAT_Z_PIXMAP:
image = xcb_image_create_native(conn, width, height, format,
imrep->depth, imrep, bytes, data);
if (!image) {
free(imrep);
return 0;
}
break;
default:
assert(0);
}
assert(bytes == image->size);
return image;
}
xcb_image_t *
xcb_image_native (xcb_connection_t * c,
xcb_image_t * image,
int convert)
{
xcb_image_t * tmp_image = 0;
const xcb_setup_t * setup = xcb_get_setup(c);
xcb_format_t * fmt = 0;
xcb_image_format_t ef = effective_format(image->format, image->bpp);
uint8_t bpp = 1;
if (image->depth > 1 || ef == XCB_IMAGE_FORMAT_Z_PIXMAP) {
fmt = find_format_by_depth(setup, image->depth);
/* XXX For now, we don't do depth conversions, even
for xy-pixmaps */
if (!fmt)
return 0;
bpp = fmt->bits_per_pixel;
}
switch (ef) {
case XCB_IMAGE_FORMAT_XY_PIXMAP:
if (setup->bitmap_format_scanline_unit != image->unit ||
setup->bitmap_format_scanline_pad != image->scanline_pad ||
setup->image_byte_order != image->byte_order ||
setup->bitmap_format_bit_order != image->bit_order ||
bpp != image->bpp) {
if (!convert)
return 0;
tmp_image =
xcb_image_create(image->width, image->height, image->format,
setup->bitmap_format_scanline_pad,
image->depth, bpp,
setup->bitmap_format_scanline_unit,
setup->image_byte_order,
setup->bitmap_format_bit_order,
0, 0, 0);
if (!tmp_image)
return 0;
}
break;
case XCB_IMAGE_FORMAT_Z_PIXMAP:
if (fmt->scanline_pad != image->scanline_pad ||
setup->image_byte_order != image->byte_order ||
bpp != image->bpp) {
if (!convert)
return 0;
tmp_image =
xcb_image_create(image->width, image->height, image->format,
fmt->scanline_pad,
image->depth, bpp, 0,
setup->image_byte_order,
XCB_IMAGE_ORDER_MSB_FIRST,
0, 0, 0);
if (!tmp_image)
return 0;
}
break;
default:
assert(0);
}
if (tmp_image) {
if (!xcb_image_convert(image, tmp_image)) {
xcb_image_destroy(tmp_image);
return 0;
}
image = tmp_image;
}
return image;
}
xcb_void_cookie_t
xcb_image_put (xcb_connection_t * conn,
xcb_drawable_t draw,
xcb_gcontext_t gc,
xcb_image_t * image,
int16_t x,
int16_t y,
uint8_t left_pad)
{
return xcb_put_image(conn, image->format, draw, gc,
image->width, image->height,
x, y, left_pad,
image->depth,
image->size,
image->data);
}
/*
* Shm stuff
*/
xcb_image_t *
xcb_image_shm_put (xcb_connection_t * conn,
xcb_drawable_t draw,
xcb_gcontext_t gc,
xcb_image_t * image,
xcb_shm_segment_info_t shminfo,
int16_t src_x,
int16_t src_y,
int16_t dest_x,
int16_t dest_y,
uint16_t src_width,
uint16_t src_height,
uint8_t send_event)
{
if (!xcb_image_native(conn, image, 0))
return 0;
if (!shminfo.shmaddr)
return 0;
xcb_shm_put_image(conn, draw, gc,
image->width, image->height,
src_x, src_y, src_width, src_height,
dest_x, dest_y,
image->depth, image->format,
send_event,
shminfo.shmseg,
image->data - shminfo.shmaddr);
return image;
}
int
xcb_image_shm_get (xcb_connection_t * conn,
xcb_drawable_t draw,
xcb_image_t * image,
xcb_shm_segment_info_t shminfo,
int16_t x,
int16_t y,
uint32_t plane_mask)
{
xcb_shm_get_image_reply_t * setup;
xcb_shm_get_image_cookie_t cookie;
xcb_generic_error_t * err = 0;
if (!shminfo.shmaddr)
return 0;
cookie = xcb_shm_get_image(conn, draw,
x, y,
image->width, image->height,
plane_mask,
image->format,
shminfo.shmseg,
image->data - shminfo.shmaddr);
setup = xcb_shm_get_image_reply(conn, cookie, &err);
if (err) {
fprintf(stderr, "ShmGetImageReply error %d\n", (int)err->error_code);
free(err);
return 0;
} else {
free (setup);
return 1;
}
}
static uint32_t
xy_image_byte (xcb_image_t *image, uint32_t x)
{
x >>= 3;
if (image->byte_order == image->bit_order)
return x;
switch (image->unit) {
default:
case 8:
return x;
case 16:
return x ^ 1;
case 32:
return x ^ 3;
}
}
static uint32_t
xy_image_bit (xcb_image_t *image, uint32_t x)
{
x &= 7;
if (image->bit_order == XCB_IMAGE_ORDER_MSB_FIRST)
x = 7 - x;
return x;
}
/* GetPixel/PutPixel */
/* XXX this is the most hideously done cut-and-paste
to below. Any bugs fixed there should be fixed here
and vice versa. */
void
xcb_image_put_pixel (xcb_image_t *image,
uint32_t x,
uint32_t y,
uint32_t pixel)
{
uint8_t *row;
if (x > image->width || y > image->height)
return;
row = image->data + (y * image->stride);
switch (effective_format(image->format, image->bpp)) {
case XCB_IMAGE_FORMAT_XY_BITMAP:
case XCB_IMAGE_FORMAT_XY_PIXMAP:
/* block */ {
int p;
uint32_t plane_mask = image->plane_mask;
uint8_t * plane = row;
uint32_t byte = xy_image_byte(image, x);
uint32_t bit = xy_image_bit(image,x);
uint8_t mask = 1 << bit;
for (p = image->bpp - 1; p >= 0; p--) {
if ((plane_mask >> p) & 1) {
uint8_t * bp = plane + byte;
uint8_t this_bit = ((pixel >> p) & 1) << bit;
*bp = (*bp & ~mask) | this_bit;
}
plane += image->stride * image->height;
}
}
break;
case XCB_IMAGE_FORMAT_Z_PIXMAP:
switch (image->bpp) {
uint32_t mask;
case 4:
mask = 0xf;
pixel &= 0xf;
if ((x & 1) ==
(image->byte_order == XCB_IMAGE_ORDER_MSB_FIRST)) {
pixel <<= 4;
mask <<= 4;
}
row[x >> 1] = (row[x >> 1] & ~mask) | pixel;
break;
case 8:
row[x] = pixel;
break;
case 16:
switch (image->byte_order) {
case XCB_IMAGE_ORDER_LSB_FIRST:
row[x << 1] = pixel;
row[(x << 1) + 1] = pixel >> 8;
break;
case XCB_IMAGE_ORDER_MSB_FIRST:
row[x << 1] = pixel >> 8;
row[(x << 1) + 1] = pixel;
break;
}
break;
case 24:
switch (image->byte_order) {
case XCB_IMAGE_ORDER_LSB_FIRST:
row[x * 3] = pixel;
row[x * 3 + 1] = pixel >> 8;
row[x * 3 + 2] = pixel >> 16;
break;
case XCB_IMAGE_ORDER_MSB_FIRST:
row[x * 3] = pixel >> 16;
row[x * 3 + 1] = pixel >> 8;
row[x * 3 + 2] = pixel;
break;
}
break;
case 32:
switch (image->byte_order) {
case XCB_IMAGE_ORDER_LSB_FIRST:
row[x << 2] = pixel;
row[(x << 2) + 1] = pixel >> 8;
row[(x << 2) + 2] = pixel >> 16;
row[(x << 2) + 3] = pixel >> 24;
break;
case XCB_IMAGE_ORDER_MSB_FIRST:
row[x << 2] = pixel >> 24;
row[(x << 2) + 1] = pixel >> 16;
row[(x << 2) + 2] = pixel >> 8;
row[(x << 2) + 3] = pixel;
break;
}
break;
default:
assert(0);
}
break;
default:
assert(0);
}
}
/* XXX this is the most hideously done cut-and-paste
from above. Any bugs fixed there should be fixed here
and vice versa. */
uint32_t
xcb_image_get_pixel (xcb_image_t *image,
uint32_t x,
uint32_t y)
{
uint32_t pixel = 0;
uint8_t *row;
assert(x < image->width && y < image->height);
row = image->data + (y * image->stride);
switch (effective_format(image->format, image->bpp)) {
case XCB_IMAGE_FORMAT_XY_BITMAP:
case XCB_IMAGE_FORMAT_XY_PIXMAP:
/* block */ {
int p;
uint32_t plane_mask = image->plane_mask;
uint8_t * plane = row;
uint32_t byte = xy_image_byte(image, x);
uint32_t bit = xy_image_bit(image,x);
for (p = image->bpp - 1; p >= 0; p--) {
pixel <<= 1;
if ((plane_mask >> p) & 1) {
uint8_t * bp = plane + byte;
pixel |= (*bp >> bit) & 1;
}
plane += image->stride * image->height;
}
}
return pixel;
case XCB_IMAGE_FORMAT_Z_PIXMAP:
switch (image->bpp) {
case 4:
if ((x & 1) == (image->byte_order == XCB_IMAGE_ORDER_MSB_FIRST))
return row[x >> 1] >> 4;
return row[x >> 1] & 0xf;
case 8:
return row[x];
case 16:
switch (image->byte_order) {
case XCB_IMAGE_ORDER_LSB_FIRST:
pixel = row[x << 1];
pixel |= row[(x << 1) + 1] << 8;
break;
case XCB_IMAGE_ORDER_MSB_FIRST:
pixel = row[x << 1] << 8;
pixel |= row[(x << 1) + 1];
break;
}
break;
case 24:
switch (image->byte_order) {
case XCB_IMAGE_ORDER_LSB_FIRST:
pixel = row[x * 3];
pixel |= row[x * 3 + 1] << 8;
pixel |= row[x * 3 + 2] << 16;
break;
case XCB_IMAGE_ORDER_MSB_FIRST:
pixel = row[x * 3] << 16;
pixel |= row[x * 3 + 1] << 8;
pixel |= row[x * 3 + 2];
break;
}
break;
case 32:
switch (image->byte_order) {
case XCB_IMAGE_ORDER_LSB_FIRST:
pixel = row[x << 2];
pixel |= row[(x << 2) + 1] << 8;
pixel |= row[(x << 2) + 2] << 16;
pixel |= row[(x << 2) + 3] << 24;
break;
case XCB_IMAGE_ORDER_MSB_FIRST:
pixel = row[x << 2] << 24;
pixel |= row[(x << 2) + 1] << 16;
pixel |= row[(x << 2) + 2] << 8;
pixel |= row[(x << 2) + 3];
break;
}
break;
default:
assert(0);
}
return pixel;
default:
assert(0);
}
}
xcb_image_t *
xcb_image_create_from_bitmap_data (uint8_t * data,
uint32_t width,
uint32_t height)
{
return xcb_image_create(width, height, XCB_IMAGE_FORMAT_XY_PIXMAP,
8, 1, 1, 8,
XCB_IMAGE_ORDER_LSB_FIRST,
XCB_IMAGE_ORDER_LSB_FIRST,
0, 0, data);
}
/*
* (Adapted from libX11.)
*
* xcb_create_pixmap_from_bitmap_data: Routine to make a pixmap of
* given depth from user supplied bitmap data.
* D is any drawable on the same screen that the pixmap will be used in.
* Data is a pointer to the bit data, and
* width & height give the size in bits of the pixmap.
*
* The following format is assumed for data:
*
* format=XY (will use XYPixmap for depth 1 and XYBitmap for larger)
* bit_order=LSBFirst
* padding=8
* bitmap_unit=8
*/
xcb_pixmap_t
xcb_create_pixmap_from_bitmap_data (xcb_connection_t * display,
xcb_drawable_t d,
uint8_t * data,
uint32_t width,
uint32_t height,
uint32_t depth,
uint32_t fg,
uint32_t bg,
xcb_gcontext_t * gcp)
{
xcb_pixmap_t pix;
xcb_image_t * image;
xcb_image_t * final_image;
xcb_gcontext_t gc;
uint32_t mask = 0;
xcb_params_gc_t gcv;
image = xcb_image_create_from_bitmap_data(data, width, height);
if (!image)
return 0;
if (depth > 1)
image->format = XCB_IMAGE_FORMAT_XY_BITMAP;
final_image = xcb_image_native(display, image, 1);
if (!final_image) {
xcb_image_destroy(image);
return 0;
}
pix = xcb_generate_id(display);
xcb_create_pixmap(display, depth, pix, d, width, height);
gc = xcb_generate_id(display);
XCB_AUX_ADD_PARAM(&mask, &gcv, foreground, fg);
XCB_AUX_ADD_PARAM(&mask, &gcv, background, bg);
xcb_aux_create_gc(display, gc, pix, mask, &gcv);
xcb_image_put(display, pix, gc, final_image, 0, 0, 0);
if (final_image != image)
xcb_image_destroy(final_image);
xcb_image_destroy(image);
if (gcp)
*gcp = gc;
else
xcb_free_gc(display, gc);
return pix;
}
/* Thanks to Keith Packard <keithp@keithp.com> for this code */
static void
swap_image(uint8_t * src,
uint32_t src_stride,
uint8_t * dst,
uint32_t dst_stride,
uint32_t height,
uint32_t byteswap,
int bitswap,
int nibbleswap)
{
while (height--) {
uint32_t s;
for (s = 0; s < src_stride; s++) {
uint8_t b;
uint32_t d = s ^ byteswap;
if (d > dst_stride)
continue;
b = src[s];
if (bitswap)
b = xcb_bit_reverse(b, 8);
if (nibbleswap)
b = (b << 4) | (b >> 4);
dst[d] = b;
}
src += src_stride;
dst += dst_stride;
}
}
/* Which order are bytes in (low two bits), given
* code which accesses an image one byte at a time
*/
static uint32_t
byte_order(xcb_image_t *i)
{
uint32_t flip = i->byte_order == XCB_IMAGE_ORDER_MSB_FIRST;
switch (i->bpp) {
default:
case 8:
return 0;
case 16:
return flip;
case 32:
return flip | (flip << 1);
}
}
static uint32_t
bit_order(xcb_image_t *i)
{
uint32_t flip = i->byte_order != i->bit_order;
switch (i->unit) {
default:
case 8:
return 0;
case 16:
return flip;
case 32:
return flip | (flip << 1);
}
}
/* Convert from one byte order to another by flipping the
* low two bits of the byte index along a scanline
*/
static uint32_t
conversion_byte_swap(xcb_image_t *src, xcb_image_t *dst)
{
xcb_image_format_t ef = effective_format(src->format, src->bpp);
/* src_ef == dst_ef in all callers of this function */
if (ef == XCB_IMAGE_FORMAT_XY_PIXMAP) {
return bit_order(src) ^ bit_order(dst);
} else {
/* src_bpp == dst_bpp in all callers of this function */
return byte_order(src) ^ byte_order(dst);
}
}
xcb_image_t *
xcb_image_convert (xcb_image_t * src,
xcb_image_t * dst)
{
xcb_image_format_t ef = effective_format(src->format, src->bpp);
/* Things will go horribly wrong here if a bad
image is passed in, so we check some things
up front just to be nice. */
assert(image_format_valid(src));
assert(image_format_valid(dst));
/* images must be the same size
* (yes, we could copy a sub-set)
*/
if (src->width != dst->width ||
src->height != dst->height)
return 0;
if (ef == effective_format(dst->format, dst->bpp) &&
src->bpp == dst->bpp)
{
if (src->unit == dst->unit &&
src->scanline_pad == dst->scanline_pad &&
src->byte_order == dst->byte_order &&
(ef == XCB_IMAGE_FORMAT_Z_PIXMAP ||
src->bit_order == dst->bit_order)) {
memcpy(dst->data, src->data, src->size);
} else {
int bitswap = 0;
int nibbleswap = 0;
uint32_t byteswap = conversion_byte_swap(src, dst);
uint32_t height = src->height;;
if (ef == XCB_IMAGE_FORMAT_Z_PIXMAP) {
if (src->bpp == 4 && src->byte_order != dst->byte_order)
nibbleswap = 1;
} else {
if (src->bit_order != dst->bit_order)
bitswap = 1;
height *= src->depth;
}
swap_image (src->data, src->stride, dst->data, dst->stride,
height, byteswap, bitswap, nibbleswap);
}
}
else
{
uint32_t x;
uint32_t y;
/* General case: Slow pixel copy. Should we optimize
Z24<->Z32 copies of either endianness? */
for (y = 0; y < src->height; y++) {
for (x = 0; x < src->width; x++) {
uint32_t pixel = xcb_image_get_pixel(src, x, y);
xcb_image_put_pixel(dst, x, y, pixel);
}
}
}
return dst;
}
xcb_image_t *
xcb_image_subimage(xcb_image_t * image,
uint32_t x,
uint32_t y,
uint32_t width,
uint32_t height,
void * base,
uint32_t bytes,
uint8_t * data)
{
int i, j;
xcb_image_t * result;
if (x + width > image->width)
return 0;
if (y + height > image->height)
return 0;
result = xcb_image_create(width, height, image->format,
image->scanline_pad, image->depth,
image->bpp, image->unit, image->byte_order,
image->bit_order,
base, bytes, data);
if (!result)
return 0;
/* XXX FIXME For now, lose on performance. Sorry. */
for (j = 0; j < height; j++) {
for (i = 0; i < width; i++) {
uint32_t pixel = xcb_image_get_pixel(image, x + i, y + j);
xcb_image_put_pixel(result, i, j, pixel);
}
}
return result;
}
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