Source code
Revision control
Copy as Markdown
Other Tools
/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2002 University of Southern California
* Copyright © 2005 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is University of Southern
* California.
*
* Contributor(s):
* Carl D. Worth <cworth@cworth.org>
* Behdad Esfahbod <behdad@behdad.org>
* Chris Wilson <chris@chris-wilson.co.uk>
* Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
*/
/* Heed well the words of Owen Taylor:
* "Any patch that works around a render bug, or claims to, without a
* specific reference to the bug filed in bugzilla.freedesktop.org will
* never pass approval."
*/
#include "cairoint.h"
#if !CAIRO_HAS_XLIB_XCB_FUNCTIONS
#include "cairo-xlib-private.h"
#include "cairo-xlib-surface-private.h"
#include "cairo-compositor-private.h"
#include "cairo-clip-private.h"
#include "cairo-damage-private.h"
#include "cairo-default-context-private.h"
#include "cairo-error-private.h"
#include "cairo-image-surface-private.h"
#include "cairo-list-inline.h"
#include "cairo-pattern-private.h"
#include "cairo-pixman-private.h"
#include "cairo-region-private.h"
#include "cairo-scaled-font-private.h"
#include "cairo-surface-snapshot-private.h"
#include "cairo-surface-subsurface-private.h"
#include <X11/Xutil.h> /* for XDestroyImage */
#include <X11/extensions/XShm.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#define DEBUG 0
#if DEBUG
#define UNSUPPORTED(reason) \
fprintf (stderr, \
"cairo-xlib: hit unsupported operation %s(), line %d: %s\n", \
__FUNCTION__, __LINE__, reason), \
CAIRO_INT_STATUS_UNSUPPORTED
#else
#define UNSUPPORTED(reason) CAIRO_INT_STATUS_UNSUPPORTED
#endif
#if DEBUG
#include <X11/Xlibint.h>
static void CAIRO_PRINTF_FORMAT (2, 3)
_x_bread_crumb (Display *dpy,
const char *fmt,
...)
{
xReq *req;
char buf[2048];
unsigned int len, len_dwords;
va_list ap;
va_start (ap, fmt);
len = vsnprintf (buf, sizeof (buf), fmt, ap);
va_end (ap);
buf[len++] = '\0';
while (len & 3)
buf[len++] = '\0';
LockDisplay (dpy);
GetEmptyReq (NoOperation, req);
len_dwords = len >> 2;
SetReqLen (req, len_dwords, len_dwords);
Data (dpy, buf, len);
UnlockDisplay (dpy);
SyncHandle ();
}
#define X_DEBUG(x) _x_bread_crumb x
#else
#define X_DEBUG(x)
#endif
/**
* SECTION:cairo-xlib
* @Title: XLib Surfaces
* @Short_Description: X Window System rendering using XLib
* @See_Also: #cairo_surface_t
*
* The XLib surface is used to render cairo graphics to X Window System
* windows and pixmaps using the XLib library.
*
* Note that the XLib surface automatically takes advantage of X render extension
* if it is available.
**/
/**
* CAIRO_HAS_XLIB_SURFACE:
*
* Defined if the Xlib surface backend is available.
* This macro can be used to conditionally compile backend-specific code.
*
* Since: 1.0
**/
/**
* SECTION:cairo-xlib-xrender
* @Title: XLib-XRender Backend
* @Short_Description: X Window System rendering using XLib and the X Render extension
* @See_Also: #cairo_surface_t
*
* The XLib surface is used to render cairo graphics to X Window System
* windows and pixmaps using the XLib and Xrender libraries.
*
* Note that the XLib surface automatically takes advantage of X Render extension
* if it is available.
**/
/**
* CAIRO_HAS_XLIB_XRENDER_SURFACE:
*
* Defined if the XLib/XRender surface functions are available.
* This macro can be used to conditionally compile backend-specific code.
*
* Since: 1.6
**/
/* Xlib doesn't define a typedef, so define one ourselves */
typedef int (*cairo_xlib_error_func_t) (Display *display,
XErrorEvent *event);
static cairo_surface_t *
_cairo_xlib_surface_create_internal (cairo_xlib_screen_t *screen,
Drawable drawable,
Visual *visual,
XRenderPictFormat *xrender_format,
int width,
int height,
int depth);
static cairo_bool_t
_cairo_surface_is_xlib (cairo_surface_t *surface);
/*
* Instead of taking two round trips for each blending request,
* assume that if a particular drawable fails GetImage that it will
* fail for a "while"; use temporary pixmaps to avoid the errors
*/
#define CAIRO_ASSUME_PIXMAP 20
static Visual *
_visual_for_xrender_format(Screen *screen,
XRenderPictFormat *xrender_format)
{
int d, v;
/* XXX Consider searching through the list of known cairo_visual_t for
* the reverse mapping.
*/
for (d = 0; d < screen->ndepths; d++) {
Depth *d_info = &screen->depths[d];
if (d_info->depth != xrender_format->depth)
continue;
for (v = 0; v < d_info->nvisuals; v++) {
Visual *visual = &d_info->visuals[v];
switch (visual->class) {
case TrueColor:
if (xrender_format->type != PictTypeDirect)
continue;
break;
case DirectColor:
/* Prefer TrueColor to DirectColor.
* (XRenderFindVisualFormat considers both TrueColor and DirectColor
* Visuals to match the same PictFormat.)
*/
continue;
case StaticGray:
case GrayScale:
case StaticColor:
case PseudoColor:
if (xrender_format->type != PictTypeIndexed)
continue;
break;
}
if (xrender_format ==
XRenderFindVisualFormat (DisplayOfScreen(screen), visual))
return visual;
}
}
return NULL;
}
static cairo_content_t
_xrender_format_to_content (XRenderPictFormat *xrender_format)
{
cairo_content_t content;
/* This only happens when using a non-Render server. Let's punt
* and say there's no alpha here. */
if (xrender_format == NULL)
return CAIRO_CONTENT_COLOR;
content = 0;
if (xrender_format->direct.alphaMask)
content |= CAIRO_CONTENT_ALPHA;
if (xrender_format->direct.redMask |
xrender_format->direct.greenMask |
xrender_format->direct.blueMask)
content |= CAIRO_CONTENT_COLOR;
return content;
}
static cairo_surface_t *
_cairo_xlib_surface_create_similar (void *abstract_src,
cairo_content_t content,
int width,
int height)
{
cairo_xlib_surface_t *src = abstract_src;
XRenderPictFormat *xrender_format;
cairo_xlib_surface_t *surface;
cairo_xlib_display_t *display;
Pixmap pix;
if (width > XLIB_COORD_MAX || height > XLIB_COORD_MAX)
return NULL;
if (width == 0 || height == 0)
return NULL;
if (_cairo_xlib_display_acquire (src->base.device, &display))
return NULL;
/* If we never found an XRenderFormat or if it isn't compatible
* with the content being requested, then we fallback to just
* constructing a cairo_format_t instead, (which will fairly
* arbitrarily pick a visual/depth for the similar surface.
*/
xrender_format = NULL;
if (src->xrender_format &&
_xrender_format_to_content (src->xrender_format) == content)
{
xrender_format = src->xrender_format;
}
if (xrender_format == NULL) {
xrender_format =
_cairo_xlib_display_get_xrender_format (display,
_cairo_format_from_content (content));
}
if (xrender_format) {
Visual *visual;
/* We've got a compatible XRenderFormat now, which means the
* similar surface will match the existing surface as closely in
* visual/depth etc. as possible. */
pix = XCreatePixmap (display->display, src->drawable,
width, height, xrender_format->depth);
if (xrender_format == src->xrender_format)
visual = src->visual;
else
visual = _visual_for_xrender_format(src->screen->screen,
xrender_format);
surface = (cairo_xlib_surface_t *)
_cairo_xlib_surface_create_internal (src->screen, pix, visual,
xrender_format,
width, height,
xrender_format->depth);
}
else
{
Screen *screen = src->screen->screen;
int depth;
/* No compatible XRenderFormat, see if we can make an ordinary pixmap,
* so that we can still accelerate blits with XCopyArea(). */
if (content != CAIRO_CONTENT_COLOR) {
cairo_device_release (&display->base);
return NULL;
}
depth = DefaultDepthOfScreen (screen);
pix = XCreatePixmap (display->display, RootWindowOfScreen (screen),
width <= 0 ? 1 : width, height <= 0 ? 1 : height,
depth);
surface = (cairo_xlib_surface_t *)
_cairo_xlib_surface_create_internal (src->screen, pix,
DefaultVisualOfScreen (screen),
NULL,
width, height, depth);
}
if (likely (surface->base.status == CAIRO_STATUS_SUCCESS))
surface->owns_pixmap = TRUE;
else
XFreePixmap (display->display, pix);
cairo_device_release (&display->base);
return &surface->base;
}
static void
_cairo_xlib_surface_discard_shm (cairo_xlib_surface_t *surface)
{
if (surface->shm == NULL)
return;
/* Force the flush for an external surface */
if (!surface->owns_pixmap)
cairo_surface_flush (surface->shm);
cairo_surface_finish (surface->shm);
cairo_surface_destroy (surface->shm);
surface->shm = NULL;
_cairo_damage_destroy (surface->base.damage);
surface->base.damage = NULL;
surface->fallback = 0;
}
static cairo_status_t
_cairo_xlib_surface_finish (void *abstract_surface)
{
cairo_xlib_surface_t *surface = abstract_surface;
cairo_status_t status;
cairo_xlib_display_t *display;
cairo_list_del (&surface->link);
status = _cairo_xlib_display_acquire (surface->base.device, &display);
if (unlikely (status))
return status;
X_DEBUG ((display->display, "finish (drawable=%x)", (unsigned int) surface->drawable));
if (surface->embedded_source.picture)
XRenderFreePicture (display->display, surface->embedded_source.picture);
if (surface->picture)
XRenderFreePicture (display->display, surface->picture);
_cairo_xlib_surface_discard_shm (surface);
if (surface->owns_pixmap)
XFreePixmap (display->display, surface->drawable);
cairo_device_release (&display->base);
return status;
}
cairo_status_t
_cairo_xlib_surface_get_gc (cairo_xlib_display_t *display,
cairo_xlib_surface_t *surface,
GC *gc)
{
*gc = _cairo_xlib_screen_get_gc (display,
surface->screen,
surface->depth,
surface->drawable);
if (unlikely (*gc == NULL))
return _cairo_error (CAIRO_STATUS_NO_MEMORY);
return CAIRO_STATUS_SUCCESS;
}
static int
_noop_error_handler (Display *display,
XErrorEvent *event)
{
return False; /* return value is ignored */
}
static void
_swap_ximage_2bytes (XImage *ximage)
{
int i, j;
char *line = ximage->data;
for (j = ximage->height; j; j--) {
uint16_t *p = (uint16_t *) line;
for (i = ximage->width; i; i--) {
*p = bswap_16 (*p);
p++;
}
line += ximage->bytes_per_line;
}
}
static void
_swap_ximage_3bytes (XImage *ximage)
{
int i, j;
char *line = ximage->data;
for (j = ximage->height; j; j--) {
uint8_t *p = (uint8_t *) line;
for (i = ximage->width; i; i--) {
uint8_t tmp;
tmp = p[2];
p[2] = p[0];
p[0] = tmp;
p += 3;
}
line += ximage->bytes_per_line;
}
}
static void
_swap_ximage_4bytes (XImage *ximage)
{
int i, j;
char *line = ximage->data;
for (j = ximage->height; j; j--) {
uint32_t *p = (uint32_t *) line;
for (i = ximage->width; i; i--) {
*p = bswap_32 (*p);
p++;
}
line += ximage->bytes_per_line;
}
}
static void
_swap_ximage_nibbles (XImage *ximage)
{
int i, j;
char *line = ximage->data;
for (j = ximage->height; j; j--) {
uint8_t *p = (uint8_t *) line;
for (i = (ximage->width + 1) / 2; i; i--) {
*p = ((*p >> 4) & 0xf) | ((*p << 4) & ~0xf);
p++;
}
line += ximage->bytes_per_line;
}
}
static void
_swap_ximage_bits (XImage *ximage)
{
int i, j;
char *line = ximage->data;
int unit = ximage->bitmap_unit;
int line_bytes = ((ximage->width + unit - 1) & ~(unit - 1)) / 8;
for (j = ximage->height; j; j--) {
char *p = line;
for (i = line_bytes; i; i--) {
char b = *p;
b = ((b << 1) & 0xaa) | ((b >> 1) & 0x55);
b = ((b << 2) & 0xcc) | ((b >> 2) & 0x33);
b = ((b << 4) & 0xf0) | ((b >> 4) & 0x0f);
*p = b;
p++;
}
line += ximage->bytes_per_line;
}
}
static void
_swap_ximage_to_native (XImage *ximage)
{
int unit_bytes = 0;
int native_byte_order = _cairo_is_little_endian () ? LSBFirst : MSBFirst;
if (ximage->bits_per_pixel == 1 &&
ximage->bitmap_bit_order != native_byte_order)
{
_swap_ximage_bits (ximage);
if (ximage->bitmap_bit_order == ximage->byte_order)
return;
}
if (ximage->byte_order == native_byte_order)
return;
switch (ximage->bits_per_pixel) {
case 1:
unit_bytes = ximage->bitmap_unit / 8;
break;
case 4:
_swap_ximage_nibbles (ximage);
/* fall-through */
case 8:
case 16:
case 20:
case 24:
case 28:
case 30:
case 32:
unit_bytes = (ximage->bits_per_pixel + 7) / 8;
break;
default:
/* This could be hit on some rare but possible cases. */
ASSERT_NOT_REACHED;
}
switch (unit_bytes) {
case 1:
break;
case 2:
_swap_ximage_2bytes (ximage);
break;
case 3:
_swap_ximage_3bytes (ximage);
break;
case 4:
_swap_ximage_4bytes (ximage);
break;
default:
ASSERT_NOT_REACHED;
}
}
/* Given a mask, (with a single sequence of contiguous 1 bits), return
* the number of 1 bits in 'width' and the number of 0 bits to its
* right in 'shift'. */
static void
_characterize_field (uint32_t mask, int *width, int *shift)
{
*width = _cairo_popcount (mask);
/* The final '& 31' is to force a 0 mask to result in 0 shift. */
*shift = _cairo_popcount ((mask - 1) & ~mask) & 31;
}
/* Convert a field of 'width' bits to 'new_width' bits with correct
* rounding. */
static inline uint32_t
_resize_field (uint32_t field, int width, int new_width)
{
if (width == 0)
return 0;
if (width >= new_width) {
return field >> (width - new_width);
} else {
uint32_t result = field << (new_width - width);
while (width < new_width) {
result |= result >> width;
width <<= 1;
}
return result;
}
}
static inline uint32_t
_adjust_field (uint32_t field, int adjustment)
{
return MIN (255, MAX(0, (int)field + adjustment));
}
/* Given a shifted field value, (described by 'width' and 'shift),
* resize it 8-bits and return that value.
*
* Note that the original field value must not have any non-field bits
* set.
*/
static inline uint32_t
_field_to_8 (uint32_t field, int width, int shift)
{
return _resize_field (field >> shift, width, 8);
}
static inline uint32_t
_field_to_8_undither (uint32_t field, int width, int shift,
int dither_adjustment)
{
return _adjust_field (_field_to_8 (field, width, shift), - dither_adjustment>>width);
}
/* Given an 8-bit value, convert it to a field of 'width', shift it up
* to 'shift, and return it. */
static inline uint32_t
_field_from_8 (uint32_t field, int width, int shift)
{
return _resize_field (field, 8, width) << shift;
}
static inline uint32_t
_field_from_8_dither (uint32_t field, int width, int shift,
int8_t dither_adjustment)
{
return _field_from_8 (_adjust_field (field, dither_adjustment>>width), width, shift);
}
static inline uint32_t
_pseudocolor_from_rgb888_dither (cairo_xlib_visual_info_t *visual_info,
uint32_t r, uint32_t g, uint32_t b,
int8_t dither_adjustment)
{
if (r == g && g == b) {
dither_adjustment /= RAMP_SIZE;
return visual_info->gray8_to_pseudocolor[_adjust_field (r, dither_adjustment)];
} else {
dither_adjustment = visual_info->dither8_to_cube[dither_adjustment+128];
return visual_info->cube_to_pseudocolor[visual_info->field8_to_cube[_adjust_field (r, dither_adjustment)]]
[visual_info->field8_to_cube[_adjust_field (g, dither_adjustment)]]
[visual_info->field8_to_cube[_adjust_field (b, dither_adjustment)]];
}
}
static inline uint32_t
_pseudocolor_to_rgb888 (cairo_xlib_visual_info_t *visual_info,
uint32_t pixel)
{
uint32_t r, g, b;
pixel &= 0xff;
r = visual_info->colors[pixel].r;
g = visual_info->colors[pixel].g;
b = visual_info->colors[pixel].b;
return (r << 16) |
(g << 8) |
(b );
}
/* should range from -128 to 127 */
#define X 16
static const int8_t dither_pattern[4][4] = {
{-8*X, +0*X, -6*X, +2*X},
{+4*X, -4*X, +6*X, -2*X},
{-5*X, +4*X, -7*X, +1*X},
{+7*X, -1*X, +5*X, -3*X}
};
#undef X
static int bits_per_pixel(cairo_xlib_surface_t *surface)
{
if (surface->depth > 16)
return 32;
else if (surface->depth > 8)
return 16;
else if (surface->depth > 1)
return 8;
else
return 1;
}
pixman_format_code_t
_pixman_format_for_xlib_surface (cairo_xlib_surface_t *surface)
{
cairo_format_masks_t masks;
pixman_format_code_t format;
masks.bpp = bits_per_pixel (surface);
masks.alpha_mask = surface->a_mask;
masks.red_mask = surface->r_mask;
masks.green_mask = surface->g_mask;
masks.blue_mask = surface->b_mask;
if (! _pixman_format_from_masks (&masks, &format))
return 0;
return format;
}
static cairo_surface_t *
_get_image_surface (cairo_xlib_surface_t *surface,
const cairo_rectangle_int_t *extents,
int try_shm)
{
cairo_int_status_t status;
cairo_image_surface_t *image = NULL;
XImage *ximage;
pixman_format_code_t pixman_format;
cairo_xlib_display_t *display;
assert (extents->x >= 0);
assert (extents->y >= 0);
assert (extents->x + extents->width <= surface->width);
assert (extents->y + extents->height <= surface->height);
if (surface->base.is_clear ||
(surface->base.serial == 0 && surface->owns_pixmap))
{
pixman_format = _pixman_format_for_xlib_surface (surface);
if (pixman_format)
{
return _cairo_image_surface_create_with_pixman_format (NULL,
pixman_format,
extents->width,
extents->height,
0);
}
}
if (surface->shm) {
cairo_image_surface_t *src = (cairo_image_surface_t *) surface->shm;
cairo_surface_t *dst;
cairo_surface_pattern_t pattern;
dst = cairo_image_surface_create (src->format,
extents->width, extents->height);
if (unlikely (dst->status))
return dst;
_cairo_pattern_init_for_surface (&pattern, &src->base);
cairo_matrix_init_translate (&pattern.base.matrix,
extents->x, extents->y);
status = _cairo_surface_paint (dst, CAIRO_OPERATOR_SOURCE, &pattern.base, NULL);
_cairo_pattern_fini (&pattern.base);
if (unlikely (status)) {
cairo_surface_destroy (dst);
dst = _cairo_surface_create_in_error (status);
}
return dst;
}
status = _cairo_xlib_display_acquire (surface->base.device, &display);
if (status)
return _cairo_surface_create_in_error (status);
pixman_format = _pixman_format_for_xlib_surface (surface);
if (try_shm && pixman_format) {
image = (cairo_image_surface_t *)
_cairo_xlib_surface_create_shm__image (surface, pixman_format,
extents->width, extents->height);
if (image && image->base.status == CAIRO_STATUS_SUCCESS) {
cairo_xlib_error_func_t old_handler;
XImage shm_image;
Bool success;
_cairo_xlib_shm_surface_get_ximage (&image->base, &shm_image);
XSync (display->display, False);
old_handler = XSetErrorHandler (_noop_error_handler);
success = XShmGetImage (display->display,
surface->drawable,
&shm_image,
extents->x, extents->y,
AllPlanes);
XSetErrorHandler (old_handler);
if (success) {
cairo_device_release (&display->base);
return &image->base;
}
cairo_surface_destroy (&image->base);
image = NULL;
}
}
if (surface->use_pixmap == 0) {
cairo_xlib_error_func_t old_handler;
XSync (display->display, False);
old_handler = XSetErrorHandler (_noop_error_handler);
ximage = XGetImage (display->display,
surface->drawable,
extents->x, extents->y,
extents->width, extents->height,
AllPlanes, ZPixmap);
XSetErrorHandler (old_handler);
/* If we get an error, the surface must have been a window,
* so retry with the safe code path.
*/
if (!ximage)
surface->use_pixmap = CAIRO_ASSUME_PIXMAP;
} else {
surface->use_pixmap--;
ximage = NULL;
}
if (ximage == NULL) {
/* XGetImage from a window is dangerous because it can
* produce errors if the window is unmapped or partially
* outside the screen. We could check for errors and
* retry, but to keep things simple, we just create a
* temporary pixmap
*/
Pixmap pixmap;
GC gc;
status = _cairo_xlib_surface_get_gc (display, surface, &gc);
if (unlikely (status))
goto BAIL;
pixmap = XCreatePixmap (display->display,
surface->drawable,
extents->width, extents->height,
surface->depth);
if (pixmap) {
XGCValues gcv;
gcv.subwindow_mode = IncludeInferiors;
XChangeGC (display->display, gc, GCSubwindowMode, &gcv);
XCopyArea (display->display, surface->drawable, pixmap, gc,
extents->x, extents->y,
extents->width, extents->height,
0, 0);
gcv.subwindow_mode = ClipByChildren;
XChangeGC (display->display, gc, GCSubwindowMode, &gcv);
ximage = XGetImage (display->display,
pixmap,
0, 0,
extents->width, extents->height,
AllPlanes, ZPixmap);
XFreePixmap (display->display, pixmap);
}
_cairo_xlib_surface_put_gc (display, surface, gc);
if (ximage == NULL) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto BAIL;
}
}
_swap_ximage_to_native (ximage);
/* We can't use pixman to simply write to image if:
* (a) the pixels are not appropriately aligned,
* (b) pixman does not the pixel format, or
* (c) if the image is palettized and we need to convert.
*/
if (pixman_format &&
ximage->bitmap_unit == 32 && ximage->bitmap_pad == 32 &&
(surface->visual == NULL || surface->visual->class == TrueColor))
{
image = (cairo_image_surface_t*)
_cairo_image_surface_create_with_pixman_format ((unsigned char *) ximage->data,
pixman_format,
ximage->width,
ximage->height,
ximage->bytes_per_line);
status = image->base.status;
if (unlikely (status))
goto BAIL;
/* Let the surface take ownership of the data */
_cairo_image_surface_assume_ownership_of_data (image);
ximage->data = NULL;
} else {
/* The visual we are dealing with is not supported by the
* standard pixman formats. So we must first convert the data
* to a supported format. */
cairo_format_t format;
unsigned char *data;
uint32_t *row;
uint32_t in_pixel, out_pixel;
unsigned int rowstride;
uint32_t a_mask=0, r_mask=0, g_mask=0, b_mask=0;
int a_width=0, r_width=0, g_width=0, b_width=0;
int a_shift=0, r_shift=0, g_shift=0, b_shift=0;
int x, y, x0, y0, x_off, y_off;
cairo_xlib_visual_info_t *visual_info = NULL;
if (surface->visual == NULL || surface->visual->class == TrueColor) {
cairo_bool_t has_alpha;
cairo_bool_t has_color;
has_alpha = surface->a_mask;
has_color = (surface->r_mask ||
surface->g_mask ||
surface->b_mask);
if (has_color) {
if (has_alpha) {
format = CAIRO_FORMAT_ARGB32;
} else {
format = CAIRO_FORMAT_RGB24;
}
} else {
/* XXX: Using CAIRO_FORMAT_A8 here would be more
* efficient, but would require slightly different code in
* the image conversion to put the alpha channel values
* into the right place. */
format = CAIRO_FORMAT_ARGB32;
}
a_mask = surface->a_mask;
r_mask = surface->r_mask;
g_mask = surface->g_mask;
b_mask = surface->b_mask;
_characterize_field (a_mask, &a_width, &a_shift);
_characterize_field (r_mask, &r_width, &r_shift);
_characterize_field (g_mask, &g_width, &g_shift);
_characterize_field (b_mask, &b_width, &b_shift);
} else {
format = CAIRO_FORMAT_RGB24;
status = _cairo_xlib_screen_get_visual_info (display,
surface->screen,
surface->visual,
&visual_info);
if (unlikely (status))
goto BAIL;
}
image = (cairo_image_surface_t *) cairo_image_surface_create
(format, ximage->width, ximage->height);
status = image->base.status;
if (unlikely (status))
goto BAIL;
data = cairo_image_surface_get_data (&image->base);
rowstride = cairo_image_surface_get_stride (&image->base) >> 2;
row = (uint32_t *) data;
x0 = extents->x + surface->base.device_transform.x0;
y0 = extents->y + surface->base.device_transform.y0;
for (y = 0, y_off = y0 % ARRAY_LENGTH (dither_pattern);
y < ximage->height;
y++, y_off = (y_off+1) % ARRAY_LENGTH (dither_pattern)) {
const int8_t *dither_row = dither_pattern[y_off];
for (x = 0, x_off = x0 % ARRAY_LENGTH (dither_pattern[0]);
x < ximage->width;
x++, x_off = (x_off+1) % ARRAY_LENGTH (dither_pattern[0])) {
int dither_adjustment = dither_row[x_off];
in_pixel = XGetPixel (ximage, x, y);
if (visual_info == NULL) {
out_pixel = (
(uint32_t)_field_to_8 (in_pixel & a_mask, a_width, a_shift) << 24 |
_field_to_8_undither (in_pixel & r_mask, r_width, r_shift, dither_adjustment) << 16 |
_field_to_8_undither (in_pixel & g_mask, g_width, g_shift, dither_adjustment) << 8 |
_field_to_8_undither (in_pixel & b_mask, b_width, b_shift, dither_adjustment));
} else {
/* Undithering pseudocolor does not look better */
out_pixel = _pseudocolor_to_rgb888 (visual_info, in_pixel);
}
row[x] = out_pixel;
}
row += rowstride;
}
cairo_surface_mark_dirty (&image->base);
}
BAIL:
if (ximage)
XDestroyImage (ximage);
cairo_device_release (&display->base);
if (unlikely (status)) {
if (image)
cairo_surface_destroy (&image->base);
return _cairo_surface_create_in_error (status);
}
return &image->base;
}
void
_cairo_xlib_surface_set_precision (cairo_xlib_surface_t *surface,
cairo_antialias_t antialias)
{
cairo_xlib_display_t *display = surface->display;
int precision;
if (display->force_precision != -1)
precision = display->force_precision;
else switch (antialias) {
default:
case CAIRO_ANTIALIAS_DEFAULT:
case CAIRO_ANTIALIAS_GRAY:
case CAIRO_ANTIALIAS_NONE:
case CAIRO_ANTIALIAS_FAST:
case CAIRO_ANTIALIAS_GOOD:
precision = PolyModeImprecise;
break;
case CAIRO_ANTIALIAS_BEST:
case CAIRO_ANTIALIAS_SUBPIXEL:
precision = PolyModePrecise;
break;
}
if (surface->precision != precision) {
XRenderPictureAttributes pa;
pa.poly_mode = precision;
XRenderChangePicture (display->display, surface->picture,
CPPolyMode, &pa);
surface->precision = precision;
}
}
void
_cairo_xlib_surface_ensure_picture (cairo_xlib_surface_t *surface)
{
cairo_xlib_display_t *display = surface->display;
XRenderPictureAttributes pa;
int mask = 0;
if (surface->picture)
return;
if (display->force_precision != -1)
pa.poly_mode = display->force_precision;
else
pa.poly_mode = PolyModeImprecise;
if (pa.poly_mode)
mask |= CPPolyMode;
surface->precision = pa.poly_mode;
surface->picture = XRenderCreatePicture (display->display,
surface->drawable,
surface->xrender_format,
mask, &pa);
}
cairo_status_t
_cairo_xlib_surface_draw_image (cairo_xlib_surface_t *surface,
cairo_image_surface_t *image,
int src_x,
int src_y,
int width,
int height,
int dst_x,
int dst_y)
{
cairo_xlib_display_t *display;
XImage ximage;
cairo_format_masks_t image_masks;
int native_byte_order = _cairo_is_little_endian () ? LSBFirst : MSBFirst;
cairo_surface_t *shm_image = NULL;
pixman_image_t *pixman_image = NULL;
cairo_status_t status;
cairo_bool_t own_data = FALSE;
cairo_bool_t is_rgb_image;
GC gc;
ximage.width = image->width;
ximage.height = image->height;
ximage.format = ZPixmap;
ximage.byte_order = native_byte_order;
ximage.bitmap_unit = 32; /* always for libpixman */
ximage.bitmap_bit_order = native_byte_order;
ximage.bitmap_pad = 32; /* always for libpixman */
ximage.depth = surface->depth;
ximage.red_mask = surface->r_mask;
ximage.green_mask = surface->g_mask;
ximage.blue_mask = surface->b_mask;
ximage.xoffset = 0;
ximage.obdata = NULL;
status = _cairo_xlib_display_acquire (surface->base.device, &display);
if (unlikely (status))
return status;
is_rgb_image = _pixman_format_to_masks (image->pixman_format, &image_masks);
if (is_rgb_image &&
(image_masks.alpha_mask == surface->a_mask || surface->a_mask == 0) &&
(image_masks.red_mask == surface->r_mask || surface->r_mask == 0) &&
(image_masks.green_mask == surface->g_mask || surface->g_mask == 0) &&
(image_masks.blue_mask == surface->b_mask || surface->b_mask == 0))
{
int ret;
ximage.bits_per_pixel = image_masks.bpp;
ximage.bytes_per_line = image->stride;
ximage.data = (char *)image->data;
if (image->base.device != surface->base.device) {
/* If PutImage will break the image up into chunks, prefer to
* send it all in one pass with ShmPutImage. For larger images,
* it is further advantageous to reduce the number of copies,
* albeit at the expense of more SHM bookkeeping.
*/
int max_request_size = XExtendedMaxRequestSize (display->display);
if (max_request_size == 0)
max_request_size = XMaxRequestSize (display->display);
if (max_request_size > 8192)
max_request_size = 8192;
if (width * height * 4 > max_request_size) {
shm_image = _cairo_xlib_surface_create_shm__image (surface,
image->pixman_format,
width, height);
if (shm_image && shm_image->status == CAIRO_STATUS_SUCCESS) {
cairo_image_surface_t *clone = (cairo_image_surface_t *) shm_image;
pixman_image_composite32 (PIXMAN_OP_SRC,
image->pixman_image, NULL, clone->pixman_image,
src_x, src_y,
0, 0,
0, 0,
width, height);
ximage.obdata = _cairo_xlib_shm_surface_get_obdata (shm_image);
ximage.data = (char *)clone->data;
ximage.bytes_per_line = clone->stride;
ximage.width = width;
ximage.height = height;
src_x = src_y = 0;
}
}
} else
ximage.obdata = _cairo_xlib_shm_surface_get_obdata (&image->base);
ret = XInitImage (&ximage);
assert (ret != 0);
}
else if (surface->visual == NULL || surface->visual->class == TrueColor)
{
pixman_format_code_t intermediate_format;
int ret;
image_masks.alpha_mask = surface->a_mask;
image_masks.red_mask = surface->r_mask;
image_masks.green_mask = surface->g_mask;
image_masks.blue_mask = surface->b_mask;
image_masks.bpp = bits_per_pixel (surface);
ret = _pixman_format_from_masks (&image_masks, &intermediate_format);
assert (ret);
shm_image = _cairo_xlib_surface_create_shm__image (surface,
intermediate_format,
width, height);
if (shm_image && shm_image->status == CAIRO_STATUS_SUCCESS) {
cairo_image_surface_t *clone = (cairo_image_surface_t *) shm_image;
pixman_image_composite32 (PIXMAN_OP_SRC,
image->pixman_image,
NULL,
clone->pixman_image,
src_x, src_y,
0, 0,
0, 0,
width, height);
ximage.data = (char *) clone->data;
ximage.obdata = _cairo_xlib_shm_surface_get_obdata (&clone->base);
ximage.bytes_per_line = clone->stride;
} else {
pixman_image = pixman_image_create_bits (intermediate_format,
width, height, NULL, 0);
if (pixman_image == NULL) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto BAIL;
}
pixman_image_composite32 (PIXMAN_OP_SRC,
image->pixman_image,
NULL,
pixman_image,
src_x, src_y,
0, 0,
0, 0,
width, height);
ximage.data = (char *) pixman_image_get_data (pixman_image);
ximage.bytes_per_line = pixman_image_get_stride (pixman_image);
}
ximage.width = width;
ximage.height = height;
ximage.bits_per_pixel = image_masks.bpp;
ret = XInitImage (&ximage);
assert (ret != 0);
src_x = src_y = 0;
}
else
{
unsigned int stride, rowstride;
int x, y, x0, y0, x_off, y_off;
uint32_t in_pixel, out_pixel, *row;
int i_a_width=0, i_r_width=0, i_g_width=0, i_b_width=0;
int i_a_shift=0, i_r_shift=0, i_g_shift=0, i_b_shift=0;
int o_a_width=0, o_r_width=0, o_g_width=0, o_b_width=0;
int o_a_shift=0, o_r_shift=0, o_g_shift=0, o_b_shift=0;
cairo_xlib_visual_info_t *visual_info = NULL;
cairo_bool_t true_color;
int ret;
ximage.bits_per_pixel = bits_per_pixel(surface);
stride = CAIRO_STRIDE_FOR_WIDTH_BPP (ximage.width,
ximage.bits_per_pixel);
ximage.bytes_per_line = stride;
ximage.data = _cairo_malloc_ab (stride, ximage.height);
if (unlikely (ximage.data == NULL)) {
status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
goto BAIL;
}
own_data = TRUE;
ret = XInitImage (&ximage);
assert (ret != 0);
_characterize_field (image_masks.alpha_mask, &i_a_width, &i_a_shift);
_characterize_field (image_masks.red_mask , &i_r_width, &i_r_shift);
_characterize_field (image_masks.green_mask, &i_g_width, &i_g_shift);
_characterize_field (image_masks.blue_mask , &i_b_width, &i_b_shift);
true_color = surface->visual == NULL ||
surface->visual->class == TrueColor;
if (true_color) {
_characterize_field (surface->a_mask, &o_a_width, &o_a_shift);
_characterize_field (surface->r_mask, &o_r_width, &o_r_shift);
_characterize_field (surface->g_mask, &o_g_width, &o_g_shift);
_characterize_field (surface->b_mask, &o_b_width, &o_b_shift);
} else {
status = _cairo_xlib_screen_get_visual_info (display,
surface->screen,
surface->visual,
&visual_info);
if (unlikely (status))
goto BAIL;
}
rowstride = image->stride >> 2;
row = (uint32_t *) image->data;
x0 = dst_x + surface->base.device_transform.x0;
y0 = dst_y + surface->base.device_transform.y0;
for (y = 0, y_off = y0 % ARRAY_LENGTH (dither_pattern);
y < ximage.height;
y++, y_off = (y_off+1) % ARRAY_LENGTH (dither_pattern))
{
const int8_t *dither_row = dither_pattern[y_off];
for (x = 0, x_off = x0 % ARRAY_LENGTH (dither_pattern[0]);
x < ximage.width;
x++, x_off = (x_off+1) % ARRAY_LENGTH (dither_pattern[0]))
{
int dither_adjustment = dither_row[x_off];
int a, r, g, b;
if (image_masks.bpp == 1)
in_pixel = !! (((uint8_t*)row)[x/8] & (1 << (x & 7)));
else if (image_masks.bpp <= 8)
in_pixel = ((uint8_t*)row)[x];
else if (image_masks.bpp <= 16)
in_pixel = ((uint16_t*)row)[x];
else if (image_masks.bpp <= 24)
#ifdef WORDS_BIGENDIAN
in_pixel = ((uint8_t*)row)[3 * x] << 16 |
((uint8_t*)row)[3 * x + 1] << 8 |
((uint8_t*)row)[3 * x + 2];
#else
in_pixel = ((uint8_t*)row)[3 * x] |
((uint8_t*)row)[3 * x + 1] << 8 |
((uint8_t*)row)[3 * x + 2] << 16;
#endif
else
in_pixel = row[x];
/* If the incoming image has no alpha channel, then the input
* is opaque and the output should have the maximum alpha value.
* For all other channels, their absence implies 0.
*/
if (image_masks.alpha_mask == 0x0)
a = 0xff;
else
a = _field_to_8 (in_pixel & image_masks.alpha_mask, i_a_width, i_a_shift);
r = _field_to_8 (in_pixel & image_masks.red_mask , i_r_width, i_r_shift);
g = _field_to_8 (in_pixel & image_masks.green_mask, i_g_width, i_g_shift);
b = _field_to_8 (in_pixel & image_masks.blue_mask , i_b_width, i_b_shift);
if (true_color) {
out_pixel = _field_from_8 (a, o_a_width, o_a_shift) |
_field_from_8_dither (r, o_r_width, o_r_shift, dither_adjustment) |
_field_from_8_dither (g, o_g_width, o_g_shift, dither_adjustment) |
_field_from_8_dither (b, o_b_width, o_b_shift, dither_adjustment);
} else {
out_pixel = _pseudocolor_from_rgb888_dither (visual_info, r, g, b, dither_adjustment);
}
XPutPixel (&ximage, x, y, out_pixel);
}
row += rowstride;
}
}
status = _cairo_xlib_surface_get_gc (display, surface, &gc);
if (unlikely (status))
goto BAIL;
if (ximage.obdata)
XShmPutImage (display->display, surface->drawable, gc, &ximage,
src_x, src_y, dst_x, dst_y, width, height, True);
else
XPutImage (display->display, surface->drawable, gc, &ximage,
src_x, src_y, dst_x, dst_y, width, height);
_cairo_xlib_surface_put_gc (display, surface, gc);
BAIL:
cairo_device_release (&display->base);
if (own_data)
free (ximage.data);
if (shm_image)
cairo_surface_destroy (shm_image);
if (pixman_image)
pixman_image_unref (pixman_image);
return CAIRO_STATUS_SUCCESS;
}
static cairo_surface_t *
_cairo_xlib_surface_source(void *abstract_surface,
cairo_rectangle_int_t *extents)
{
cairo_xlib_surface_t *surface = abstract_surface;
if (extents) {
extents->x = extents->y = 0;
extents->width = surface->width;
extents->height = surface->height;
}
return &surface->base;
}
static cairo_status_t
_cairo_xlib_surface_acquire_source_image (void *abstract_surface,
cairo_image_surface_t **image_out,
void **image_extra)
{
cairo_xlib_surface_t *surface = abstract_surface;
cairo_rectangle_int_t extents;
*image_extra = NULL;
*image_out = (cairo_image_surface_t *)
_cairo_xlib_surface_get_shm (abstract_surface, FALSE);
if (*image_out)
return (*image_out)->base.status;
extents.x = extents.y = 0;
extents.width = surface->width;
extents.height = surface->height;
*image_out = (cairo_image_surface_t*)
_get_image_surface (surface, &extents, TRUE);
return (*image_out)->base.status;
}
static cairo_surface_t *
_cairo_xlib_surface_snapshot (void *abstract_surface)
{
cairo_xlib_surface_t *surface = abstract_surface;
cairo_rectangle_int_t extents;
extents.x = extents.y = 0;
extents.width = surface->width;
extents.height = surface->height;
return _get_image_surface (surface, &extents, FALSE);
}
static void
_cairo_xlib_surface_release_source_image (void *abstract_surface,
cairo_image_surface_t *image,
void *image_extra)
{
cairo_xlib_surface_t *surface = abstract_surface;
if (&image->base == surface->shm)
return;
cairo_surface_destroy (&image->base);
}
static cairo_image_surface_t *
_cairo_xlib_surface_map_to_image (void *abstract_surface,
const cairo_rectangle_int_t *extents)
{
cairo_xlib_surface_t *surface = abstract_surface;
cairo_surface_t *image;
image = _cairo_xlib_surface_get_shm (abstract_surface, FALSE);
if (image) {
assert (surface->base.damage);
surface->fallback++;
return _cairo_image_surface_map_to_image (image, extents);
}
image = _get_image_surface (abstract_surface, extents, TRUE);
cairo_surface_set_device_offset (image, -extents->x, -extents->y);
return (cairo_image_surface_t *) image;
}
static cairo_int_status_t
_cairo_xlib_surface_unmap_image (void *abstract_surface,
cairo_image_surface_t *image)
{
cairo_xlib_surface_t *surface = abstract_surface;
cairo_int_status_t status;
if (surface->shm) {
cairo_rectangle_int_t r;
assert (surface->fallback);
assert (surface->base.damage);
r.x = image->base.device_transform_inverse.x0;
r.y = image->base.device_transform_inverse.y0;
r.width = image->width;
r.height = image->height;
TRACE ((stderr, "%s: adding damage (%d,%d)x(%d,%d)\n",
__FUNCTION__, r.x, r.y, r.width, r.height));
surface->shm->damage =
_cairo_damage_add_rectangle (surface->shm->damage, &r);
return _cairo_image_surface_unmap_image (surface->shm, image);
}
status = _cairo_xlib_surface_draw_image (abstract_surface, image,
0, 0,
image->width, image->height,
image->base.device_transform_inverse.x0,
image->base.device_transform_inverse.y0);
cairo_surface_finish (&image->base);
cairo_surface_destroy (&image->base);
return status;
}
static cairo_status_t
_cairo_xlib_surface_flush (void *abstract_surface,
unsigned flags)
{
cairo_xlib_surface_t *surface = abstract_surface;
cairo_int_status_t status;
if (flags)
return CAIRO_STATUS_SUCCESS;
status = _cairo_xlib_surface_put_shm (surface);
if (unlikely (status))
return status;
surface->fallback >>= 1;
if (surface->shm && _cairo_xlib_shm_surface_is_idle (surface->shm))
_cairo_xlib_surface_discard_shm (surface);
return CAIRO_STATUS_SUCCESS;
}
static cairo_bool_t
_cairo_xlib_surface_get_extents (void *abstract_surface,
cairo_rectangle_int_t *rectangle)
{
cairo_xlib_surface_t *surface = abstract_surface;
rectangle->x = 0;
rectangle->y = 0;
rectangle->width = surface->width;
rectangle->height = surface->height;
return TRUE;
}
static void
_cairo_xlib_surface_get_font_options (void *abstract_surface,
cairo_font_options_t *options)
{
cairo_xlib_surface_t *surface = abstract_surface;
*options = *_cairo_xlib_screen_get_font_options (surface->screen);
}
static inline cairo_int_status_t
get_compositor (cairo_xlib_surface_t **surface,
const cairo_compositor_t **compositor)
{
cairo_xlib_surface_t *s = *surface;
cairo_int_status_t status = CAIRO_INT_STATUS_SUCCESS;;
if (s->fallback) {
assert (s->base.damage != NULL);
assert (s->shm != NULL);
assert (s->shm->damage != NULL);
if (! _cairo_xlib_shm_surface_is_active (s->shm)) {
*surface = (cairo_xlib_surface_t *) s->shm;
*compositor = ((cairo_image_surface_t *) s->shm)->compositor;
s->fallback++;
} else {
status = _cairo_xlib_surface_put_shm (s);
s->fallback = 0;
*compositor = s->compositor;
}
} else
*compositor = s->compositor;
return status;
}
static cairo_int_status_t
_cairo_xlib_surface_paint (void *_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_clip_t *clip)
{
cairo_xlib_surface_t *surface = _surface;
const cairo_compositor_t *compositor;
cairo_int_status_t status;
status = get_compositor (&surface, &compositor);
if (unlikely (status))
return status;
return _cairo_compositor_paint (compositor, &surface->base,
op, source,
clip);
}
static cairo_int_status_t
_cairo_xlib_surface_mask (void *_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_pattern_t *mask,
const cairo_clip_t *clip)
{
cairo_xlib_surface_t *surface = _surface;
const cairo_compositor_t *compositor;
cairo_int_status_t status;
status = get_compositor (&surface, &compositor);
if (unlikely (status))
return status;
return _cairo_compositor_mask (compositor, &surface->base,
op, source, mask,
clip);
}
static cairo_int_status_t
_cairo_xlib_surface_stroke (void *_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_path_fixed_t *path,
const cairo_stroke_style_t *style,
const cairo_matrix_t *ctm,
const cairo_matrix_t *ctm_inverse,
double tolerance,
cairo_antialias_t antialias,
const cairo_clip_t *clip)
{
cairo_xlib_surface_t *surface = _surface;
const cairo_compositor_t *compositor;
cairo_int_status_t status;
status = get_compositor (&surface, &compositor);
if (unlikely (status))
return status;
return _cairo_compositor_stroke (compositor, &surface->base,
op, source,
path, style, ctm, ctm_inverse,
tolerance, antialias,
clip);
}
static cairo_int_status_t
_cairo_xlib_surface_fill (void *_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
const cairo_path_fixed_t *path,
cairo_fill_rule_t fill_rule,
double tolerance,
cairo_antialias_t antialias,
const cairo_clip_t *clip)
{
cairo_xlib_surface_t *surface = _surface;
const cairo_compositor_t *compositor;
cairo_int_status_t status;
status = get_compositor (&surface, &compositor);
if (unlikely (status))
return status;
return _cairo_compositor_fill (compositor, &surface->base,
op, source,
path, fill_rule, tolerance, antialias,
clip);
}
static cairo_int_status_t
_cairo_xlib_surface_glyphs (void *_surface,
cairo_operator_t op,
const cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font,
const cairo_clip_t *clip)
{
cairo_xlib_surface_t *surface = _surface;
const cairo_compositor_t *compositor;
cairo_int_status_t status;
status = get_compositor (&surface, &compositor);
if (unlikely (status))
return status;
return _cairo_compositor_glyphs (compositor, &surface->base,
op, source,
glyphs, num_glyphs, scaled_font,
clip);
}
static const cairo_surface_backend_t cairo_xlib_surface_backend = {
CAIRO_SURFACE_TYPE_XLIB,
_cairo_xlib_surface_finish,
_cairo_default_context_create,
_cairo_xlib_surface_create_similar,
_cairo_xlib_surface_create_similar_shm,
_cairo_xlib_surface_map_to_image,
_cairo_xlib_surface_unmap_image,
_cairo_xlib_surface_source,
_cairo_xlib_surface_acquire_source_image,
_cairo_xlib_surface_release_source_image,
_cairo_xlib_surface_snapshot,
NULL, /* copy_page */
NULL, /* show_page */
_cairo_xlib_surface_get_extents,
_cairo_xlib_surface_get_font_options,
_cairo_xlib_surface_flush,
NULL, /* mark_dirty_rectangle */
_cairo_xlib_surface_paint,
_cairo_xlib_surface_mask,
_cairo_xlib_surface_stroke,
_cairo_xlib_surface_fill,
NULL, /* fill-stroke */
_cairo_xlib_surface_glyphs,
};
/**
* _cairo_surface_is_xlib:
* @surface: a #cairo_surface_t
*
* Checks if a surface is a #cairo_xlib_surface_t
*
* Return value: True if the surface is an xlib surface
**/
static cairo_bool_t
_cairo_surface_is_xlib (cairo_surface_t *surface)
{
return surface->backend == &cairo_xlib_surface_backend;
}
static cairo_surface_t *
_cairo_xlib_surface_create_internal (cairo_xlib_screen_t *screen,
Drawable drawable,
Visual *visual,
XRenderPictFormat *xrender_format,
int width,
int height,
int depth)
{
cairo_xlib_surface_t *surface;
cairo_xlib_display_t *display;
cairo_status_t status;
if (depth == 0) {
if (xrender_format) {
depth = xrender_format->depth;
/* XXX find matching visual for core/dithering fallbacks? */
} else if (visual) {
Screen *scr = screen->screen;
if (visual == DefaultVisualOfScreen (scr)) {
depth = DefaultDepthOfScreen (scr);
} else {
int j, k;
/* This is ugly, but we have to walk over all visuals
* for the display to find the correct depth.
*/
depth = 0;
for (j = 0; j < scr->ndepths; j++) {
Depth *d = &scr->depths[j];
for (k = 0; k < d->nvisuals; k++) {
if (&d->visuals[k] == visual) {
depth = d->depth;
goto found;
}
}
}
}
}
if (depth == 0)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_VISUAL));
found:
;
}
surface = _cairo_malloc (sizeof (cairo_xlib_surface_t));
if (unlikely (surface == NULL))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
status = _cairo_xlib_display_acquire (screen->device, &display);
if (unlikely (status)) {
free (surface);
return _cairo_surface_create_in_error (_cairo_error (status));
}
surface->display = display;
if (CAIRO_RENDER_HAS_CREATE_PICTURE (display)) {
if (!xrender_format) {
if (visual) {
xrender_format = XRenderFindVisualFormat (display->display, visual);
} else if (depth == 1) {
xrender_format =
_cairo_xlib_display_get_xrender_format (display,
CAIRO_FORMAT_A1);
}
}
}
cairo_device_release (&display->base);
_cairo_surface_init (&surface->base,
&cairo_xlib_surface_backend,
screen->device,
_xrender_format_to_content (xrender_format),
FALSE); /* is_vector */
surface->screen = screen;
surface->compositor = display->compositor;
surface->shm = NULL;
surface->fallback = 0;
surface->drawable = drawable;
surface->owns_pixmap = FALSE;
surface->use_pixmap = 0;
surface->width = width;
surface->height = height;
surface->picture = None;
surface->precision = PolyModePrecise;
surface->embedded_source.picture = None;
surface->visual = visual;
surface->xrender_format = xrender_format;
surface->depth = depth;
/*
* Compute the pixel format masks from either a XrenderFormat or
* else from a visual; failing that we assume the drawable is an
* alpha-only pixmap as it could only have been created that way
* through the cairo_xlib_surface_create_for_bitmap function.
*/
if (xrender_format) {
surface->a_mask = (unsigned long)
surface->xrender_format->direct.alphaMask
<< surface->xrender_format->direct.alpha;
surface->r_mask = (unsigned long)
surface->xrender_format->direct.redMask
<< surface->xrender_format->direct.red;
surface->g_mask = (unsigned long)
surface->xrender_format->direct.greenMask
<< surface->xrender_format->direct.green;
surface->b_mask = (unsigned long)
surface->xrender_format->direct.blueMask
<< surface->xrender_format->direct.blue;
} else if (visual) {
surface->a_mask = 0;
surface->r_mask = visual->red_mask;
surface->g_mask = visual->green_mask;
surface->b_mask = visual->blue_mask;
} else {
if (depth < 32)
surface->a_mask = (1 << depth) - 1;
else
surface->a_mask = 0xffffffff;
surface->r_mask = 0;
surface->g_mask = 0;
surface->b_mask = 0;
}
cairo_list_add (&surface->link, &screen->surfaces);
return &surface->base;
}
static Screen *
_cairo_xlib_screen_from_visual (Display *dpy, Visual *visual)
{
int s, d, v;
for (s = 0; s < ScreenCount (dpy); s++) {
Screen *screen;
screen = ScreenOfDisplay (dpy, s);
if (visual == DefaultVisualOfScreen (screen))
return screen;
for (d = 0; d < screen->ndepths; d++) {
Depth *depth;
depth = &screen->depths[d];
for (v = 0; v < depth->nvisuals; v++)
if (visual == &depth->visuals[v])
return screen;
}
}
return NULL;
}
static cairo_bool_t valid_size (int width, int height)
{
/* Note: the minimum surface size allowed in the X protocol is 1x1.
* However, as we historically did not check the minimum size we
* allowed applications to lie and set the correct size later (one hopes).
* To preserve compatibility we must allow applications to use
* 0x0 surfaces.
*/
return (width >= 0 && width <= XLIB_COORD_MAX &&
height >= 0 && height <= XLIB_COORD_MAX);
}
/**
* cairo_xlib_surface_create:
* @dpy: an X Display
* @drawable: an X Drawable, (a Pixmap or a Window)
* @visual: the visual to use for drawing to @drawable. The depth
* of the visual must match the depth of the drawable.
* Currently, only TrueColor visuals are fully supported.
* @width: the current width of @drawable.
* @height: the current height of @drawable.
*
* Creates an Xlib surface that draws to the given drawable.
* The way that colors are represented in the drawable is specified
* by the provided visual.
*
* Note: If @drawable is a Window, then the function
* cairo_xlib_surface_set_size() must be called whenever the size of the
* window changes.
*
* When @drawable is a Window containing child windows then drawing to
* the created surface will be clipped by those child windows. When
* the created surface is used as a source, the contents of the
* children will be included.
*
* Return value: the newly created surface
*
* Since: 1.0
**/
cairo_surface_t *
cairo_xlib_surface_create (Display *dpy,
Drawable drawable,
Visual *visual,
int width,
int height)
{
Screen *scr;
cairo_xlib_screen_t *screen;
cairo_status_t status;
if (! valid_size (width, height)) {
/* you're lying, and you know it! */
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
}
scr = _cairo_xlib_screen_from_visual (dpy, visual);
if (scr == NULL)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_VISUAL));
status = _cairo_xlib_screen_get (dpy, scr, &screen);
if (unlikely (status))
return _cairo_surface_create_in_error (status);
X_DEBUG ((dpy, "create (drawable=%x)", (unsigned int) drawable));
return _cairo_xlib_surface_create_internal (screen, drawable,
visual, NULL,
width, height, 0);
}
/**
* cairo_xlib_surface_create_for_bitmap:
* @dpy: an X Display
* @bitmap: an X Drawable, (a depth-1 Pixmap)
* @screen: the X Screen associated with @bitmap
* @width: the current width of @bitmap.
* @height: the current height of @bitmap.
*
* Creates an Xlib surface that draws to the given bitmap.
* This will be drawn to as a %CAIRO_FORMAT_A1 object.
*
* Return value: the newly created surface
*
* Since: 1.0
**/
cairo_surface_t *
cairo_xlib_surface_create_for_bitmap (Display *dpy,
Pixmap bitmap,
Screen *scr,
int width,
int height)
{
cairo_xlib_screen_t *screen;
cairo_status_t status;
if (! valid_size (width, height))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
status = _cairo_xlib_screen_get (dpy, scr, &screen);
if (unlikely (status))
return _cairo_surface_create_in_error (status);
X_DEBUG ((dpy, "create_for_bitmap (drawable=%x)", (unsigned int) bitmap));
return _cairo_xlib_surface_create_internal (screen, bitmap,
NULL, NULL,
width, height, 1);
}
#if CAIRO_HAS_XLIB_XRENDER_SURFACE
/**
* cairo_xlib_surface_create_with_xrender_format:
* @dpy: an X Display
* @drawable: an X Drawable, (a Pixmap or a Window)
* @screen: the X Screen associated with @drawable
* @format: the picture format to use for drawing to @drawable. The depth
* of @format must match the depth of the drawable.
* @width: the current width of @drawable.
* @height: the current height of @drawable.
*
* Creates an Xlib surface that draws to the given drawable.
* The way that colors are represented in the drawable is specified
* by the provided picture format.
*
* Note: If @drawable is a Window, then the function
* cairo_xlib_surface_set_size() must be called whenever the size of the
* window changes.
*
* Return value: the newly created surface
*
* Since: 1.0
**/
cairo_surface_t *
cairo_xlib_surface_create_with_xrender_format (Display *dpy,
Drawable drawable,
Screen *scr,
XRenderPictFormat *format,
int width,
int height)
{
cairo_xlib_screen_t *screen;
cairo_status_t status;
if (! valid_size (width, height))
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_INVALID_SIZE));
status = _cairo_xlib_screen_get (dpy, scr, &screen);
if (unlikely (status))
return _cairo_surface_create_in_error (status);
X_DEBUG ((dpy, "create_with_xrender_format (drawable=%x)", (unsigned int) drawable));
return _cairo_xlib_surface_create_internal (screen, drawable,
_visual_for_xrender_format (scr, format),
format, width, height, 0);
}
/**
* cairo_xlib_surface_get_xrender_format:
* @surface: an xlib surface
*
* Gets the X Render picture format that @surface uses for rendering with the
* X Render extension. If the surface was created by
* cairo_xlib_surface_create_with_xrender_format() originally, the return
* value is the format passed to that constructor.
*
* Return value: the XRenderPictFormat* associated with @surface,
* or %NULL if the surface is not an xlib surface
* or if the X Render extension is not available.
*
* Since: 1.6
**/
XRenderPictFormat *
cairo_xlib_surface_get_xrender_format (cairo_surface_t *surface)
{
cairo_xlib_surface_t *xlib_surface = (cairo_xlib_surface_t *) surface;
/* Throw an error for a non-xlib surface */
if (! _cairo_surface_is_xlib (surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return NULL;
}
return xlib_surface->xrender_format;
}
#endif
/**
* cairo_xlib_surface_set_size:
* @surface: a #cairo_surface_t for the XLib backend
* @width: the new width of the surface
* @height: the new height of the surface
*
* Informs cairo of the new size of the X Drawable underlying the
* surface. For a surface created for a Window (rather than a Pixmap),
* this function must be called each time the size of the window
* changes. (For a subwindow, you are normally resizing the window
* yourself, but for a toplevel window, it is necessary to listen for
* ConfigureNotify events.)
*
* A Pixmap can never change size, so it is never necessary to call
* this function on a surface created for a Pixmap.
*
* Since: 1.0
**/
void
cairo_xlib_surface_set_size (cairo_surface_t *abstract_surface,
int width,
int height)
{
cairo_xlib_surface_t *surface = (cairo_xlib_surface_t *) abstract_surface;
cairo_status_t status;
if (unlikely (abstract_surface->status))
return;
if (unlikely (abstract_surface->finished)) {
_cairo_surface_set_error (abstract_surface,
_cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
return;
}
if (! _cairo_surface_is_xlib (abstract_surface)) {
_cairo_surface_set_error (abstract_surface,
_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
return;
}
if (surface->width == width && surface->height == height)
return;
if (! valid_size (width, height)) {
_cairo_surface_set_error (abstract_surface,
_cairo_error (CAIRO_STATUS_INVALID_SIZE));
return;
}
status = _cairo_surface_flush (abstract_surface, 0);
if (unlikely (status)) {
_cairo_surface_set_error (abstract_surface, status);
return;
}
_cairo_xlib_surface_discard_shm (surface);
surface->width = width;
surface->height = height;
}
/**
* cairo_xlib_surface_set_drawable:
* @surface: a #cairo_surface_t for the XLib backend
* @drawable: the new drawable for the surface
* @width: the width of the new drawable
* @height: the height of the new drawable
*
* Informs cairo of a new X Drawable underlying the
* surface. The drawable must match the display, screen
* and format of the existing drawable or the application
* will get X protocol errors and will probably terminate.
* No checks are done by this function to ensure this
* compatibility.
*
* Since: 1.0
**/
void
cairo_xlib_surface_set_drawable (cairo_surface_t *abstract_surface,
Drawable drawable,
int width,
int height)
{
cairo_xlib_surface_t *surface = (cairo_xlib_surface_t *)abstract_surface;
cairo_status_t status;
if (unlikely (abstract_surface->status))
return;
if (unlikely (abstract_surface->finished)) {
status = _cairo_surface_set_error (abstract_surface,
_cairo_error (CAIRO_STATUS_SURFACE_FINISHED));
return;
}
if (! _cairo_surface_is_xlib (abstract_surface)) {
status = _cairo_surface_set_error (abstract_surface,
_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
return;
}
if (! valid_size (width, height)) {
status = _cairo_surface_set_error (abstract_surface,
_cairo_error (CAIRO_STATUS_INVALID_SIZE));
return;
}
/* XXX: and what about this case? */
if (surface->owns_pixmap)
return;
status = _cairo_surface_flush (abstract_surface, 0);
if (unlikely (status)) {
_cairo_surface_set_error (abstract_surface, status);
return;
}
if (surface->drawable != drawable) {
cairo_xlib_display_t *display;
status = _cairo_xlib_display_acquire (surface->base.device, &display);
if (unlikely (status))
return;
X_DEBUG ((display->display, "set_drawable (drawable=%x)", (unsigned int) drawable));
if (surface->picture != None) {
XRenderFreePicture (display->display, surface->picture);
if (unlikely (status)) {
status = _cairo_surface_set_error (&surface->base, status);
return;
}
surface->picture = None;
}
cairo_device_release (&display->base);
surface->drawable = drawable;
}
if (surface->width != width || surface->height != height) {
_cairo_xlib_surface_discard_shm (surface);
surface->width = width;
surface->height = height;
}
}
/**
* cairo_xlib_surface_get_display:
* @surface: a #cairo_xlib_surface_t
*
* Get the X Display for the underlying X Drawable.
*
* Return value: the display.
*
* Since: 1.2
**/
Display *
cairo_xlib_surface_get_display (cairo_surface_t *abstract_surface)
{
if (! _cairo_surface_is_xlib (abstract_surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return NULL;
}
return ((cairo_xlib_display_t *) abstract_surface->device)->display;
}
/**
* cairo_xlib_surface_get_drawable:
* @surface: a #cairo_xlib_surface_t
*
* Get the underlying X Drawable used for the surface.
*
* Return value: the drawable.
*
* Since: 1.2
**/
Drawable
cairo_xlib_surface_get_drawable (cairo_surface_t *abstract_surface)
{
cairo_xlib_surface_t *surface = (cairo_xlib_surface_t *) abstract_surface;
if (! _cairo_surface_is_xlib (abstract_surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return 0;
}
return surface->drawable;
}
/**
* cairo_xlib_surface_get_screen:
* @surface: a #cairo_xlib_surface_t
*
* Get the X Screen for the underlying X Drawable.
*
* Return value: the screen.
*
* Since: 1.2
**/
Screen *
cairo_xlib_surface_get_screen (cairo_surface_t *abstract_surface)
{
cairo_xlib_surface_t *surface = (cairo_xlib_surface_t *) abstract_surface;
if (! _cairo_surface_is_xlib (abstract_surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return NULL;
}
return surface->screen->screen;
}
/**
* cairo_xlib_surface_get_visual:
* @surface: a #cairo_xlib_surface_t
*
* Gets the X Visual associated with @surface, suitable for use with the
* underlying X Drawable. If @surface was created by
* cairo_xlib_surface_create(), the return value is the Visual passed to that
* constructor.
*
* Return value: the Visual or %NULL if there is no appropriate Visual for
* @surface.
*
* Since: 1.2
**/
Visual *
cairo_xlib_surface_get_visual (cairo_surface_t *surface)
{
cairo_xlib_surface_t *xlib_surface = (cairo_xlib_surface_t *) surface;
if (! _cairo_surface_is_xlib (surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return NULL;
}
return xlib_surface->visual;
}
/**
* cairo_xlib_surface_get_depth:
* @surface: a #cairo_xlib_surface_t
*
* Get the number of bits used to represent each pixel value.
*
* Return value: the depth of the surface in bits.
*
* Since: 1.2
**/
int
cairo_xlib_surface_get_depth (cairo_surface_t *abstract_surface)
{
cairo_xlib_surface_t *surface = (cairo_xlib_surface_t *) abstract_surface;
if (! _cairo_surface_is_xlib (abstract_surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return 0;
}
return surface->depth;
}
/**
* cairo_xlib_surface_get_width:
* @surface: a #cairo_xlib_surface_t
*
* Get the width of the X Drawable underlying the surface in pixels.
*
* Return value: the width of the surface in pixels.
*
* Since: 1.2
**/
int
cairo_xlib_surface_get_width (cairo_surface_t *abstract_surface)
{
cairo_xlib_surface_t *surface = (cairo_xlib_surface_t *) abstract_surface;
if (! _cairo_surface_is_xlib (abstract_surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return 0;
}
return surface->width;
}
/**
* cairo_xlib_surface_get_height:
* @surface: a #cairo_xlib_surface_t
*
* Get the height of the X Drawable underlying the surface in pixels.
*
* Return value: the height of the surface in pixels.
*
* Since: 1.2
**/
int
cairo_xlib_surface_get_height (cairo_surface_t *abstract_surface)
{
cairo_xlib_surface_t *surface = (cairo_xlib_surface_t *) abstract_surface;
if (! _cairo_surface_is_xlib (abstract_surface)) {
_cairo_error_throw (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
return 0;
}
return surface->height;
}
#endif /* !CAIRO_HAS_XLIB_XCB_FUNCTIONS */