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Real cursor support in x11grab. 

Patch by Roxis /// roxis list dot ru
Slight changes by me to update the patch to current svn.

Originally committed as revision 20631 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Roxis 2009-11-27 17:58:48 +00:00 committed by Michael Niedermayer
parent d3298350bb
commit 781c1aa6dc
2 changed files with 28 additions and 85 deletions
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5
configure vendored
View File

@ -1249,7 +1249,7 @@ v4l2_indev_deps_any="linux_videodev2_h sys_videoio_h"
vfwcap_indev_deps="capCreateCaptureWindow"
vfwcap_indev_extralibs="-lvfw32"
x11_grab_device_indev_deps="x11grab XShmCreateImage"
x11_grab_device_indev_extralibs="-lX11 -lXext"
x11_grab_device_indev_extralibs="-lX11 -lXext -lXfixes"
# protocols
gopher_protocol_deps="network"
@ -2477,7 +2477,8 @@ enabled x11grab &&
check_header X11/Xlib.h &&
check_header X11/extensions/XShm.h &&
check_func XOpenDisplay -lX11 &&
check_func XShmCreateImage -lX11 -lXext
check_func XShmCreateImage -lX11 -lXext &&
check_func XFixesGetCursorImage -lX11 -lXext -lXfixes
enabled debug && add_cflags -g"$debuglevel" && add_asflags -g"$debuglevel"

108
libavdevice/x11grab.c
View File

@ -45,6 +45,7 @@
#include <X11/Xutil.h>
#include <sys/shm.h>
#include <X11/extensions/XShm.h>
#include <X11/extensions/Xfixes.h>
/**
* X11 Device Demuxer context
@ -234,35 +235,6 @@ x11grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
return 0;
}
/**
* Get pointer coordinates from X11.
*
* @param x Integer where horizontal coordinate will be returned
* @param y Integer where vertical coordinate will be returned
* @param dpy X11 display from where pointer coordinates are retrieved
* @param s1 Context used for logging errors if necessary
*/
static void
get_pointer_coordinates(int *x, int *y, Display *dpy, AVFormatContext *s1)
{
Window mrootwindow, childwindow;
int dummy;
mrootwindow = DefaultRootWindow(dpy);
if (XQueryPointer(dpy, mrootwindow, &mrootwindow, &childwindow,
x, y, &dummy, &dummy, (unsigned int*)&dummy)) {
} else {
struct x11_grab *s = s1->priv_data;
if (!s->mouse_warning_shown) {
av_log(s1, AV_LOG_INFO, "couldn't find mouse pointer\n");
s->mouse_warning_shown = 1;
}
*x = -1;
*y = -1;
}
}
/**
* Mouse painting helper function that applies an 'and' and 'or' mask pair to
* '*dst' pixel. It actually draws a mouse pointer pixel to grabbed frame.
@ -300,71 +272,43 @@ apply_masks(uint8_t *dst, int and, int or, int bits_per_pixel)
* @param y Mouse pointer coordinate
*/
static void
paint_mouse_pointer(XImage *image, struct x11_grab *s, int x, int y)
paint_mouse_pointer(XImage *image, struct x11_grab *s)
{
/* 16x20x1bpp bitmap for the black channel of the mouse pointer */
static const uint16_t const mousePointerBlack[] =
{
0x0000, 0x0003, 0x0005, 0x0009, 0x0011,
0x0021, 0x0041, 0x0081, 0x0101, 0x0201,
0x03c1, 0x0049, 0x0095, 0x0093, 0x0120,
0x0120, 0x0240, 0x0240, 0x0380, 0x0000
};
/* 16x20x1bpp bitmap for the white channel of the mouse pointer */
static const uint16_t const mousePointerWhite[] =
{
0x0000, 0x0000, 0x0002, 0x0006, 0x000e,
0x001e, 0x003e, 0x007e, 0x00fe, 0x01fe,
0x003e, 0x0036, 0x0062, 0x0060, 0x00c0,
0x00c0, 0x0180, 0x0180, 0x0000, 0x0000
};
int x_off = s->x_off;
int y_off = s->y_off;
int width = s->width;
int height = s->height;
Display *dpy = s->dpy;
XFixesCursorImage *xcim;
int x, y;
int line, column;
int to_line, to_column;
int image_addr, xcim_addr;
if ( x - x_off >= 0 && x < width + x_off
&& y - y_off >= 0 && y < height + y_off) {
uint8_t *im_data = (uint8_t*)image->data;
int bytes_per_pixel;
int line;
int masks;
xcim = XFixesGetCursorImage(dpy);;
/* Select correct masks and pixel size */
if (image->bits_per_pixel == 8) {
masks = 1;
} else {
masks = (image->red_mask|image->green_mask|image->blue_mask);
}
bytes_per_pixel = image->bits_per_pixel>>3;
x = xcim->x - xcim->xhot;
y = xcim->y - xcim->yhot;
/* Shift to right line */
im_data += image->bytes_per_line * (y - y_off);
/* Shift to right pixel in the line */
im_data += bytes_per_pixel * (x - x_off);
to_line = FFMIN((y + xcim->height), (height + y_off));
to_column = FFMIN((x + xcim->width), (width + x_off));
/* Draw the cursor - proper loop */
for (line = 0; line < FFMIN(20, (y_off + height) - y); line++) {
uint8_t *cursor = im_data;
int column;
uint16_t bm_b;
uint16_t bm_w;
for (line = FFMAX(y, y_off); line < to_line; line++) {
for (column = FFMAX(x, x_off); column < to_column; column++) {
xcim_addr = (line - y) * xcim->width + column - x;
bm_b = mousePointerBlack[line];
bm_w = mousePointerWhite[line];
if ((unsigned char)(xcim->pixels[xcim_addr] >> 24) != 0) { // skip fully transparent pixel
image_addr = ((line - y_off) * width + column - x_off) * 4;
for (column = 0; column < FFMIN(16, (x_off + width) - x); column++) {
apply_masks(cursor, ~(masks*(bm_b&1)), masks*(bm_w&1),
image->bits_per_pixel);
cursor += bytes_per_pixel;
bm_b >>= 1;
bm_w >>= 1;
image->data[image_addr] = (unsigned char)(xcim->pixels[xcim_addr] >> 0);
image->data[image_addr+1] = (unsigned char)(xcim->pixels[xcim_addr] >> 8);
image->data[image_addr+2] = (unsigned char)(xcim->pixels[xcim_addr] >> 16);
}
im_data += image->bytes_per_line;
}
}
XFree(xcim);
xcim = NULL;
}
@ -469,9 +413,7 @@ x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
}
{
int pointer_x, pointer_y;
get_pointer_coordinates(&pointer_x, &pointer_y, dpy, s1);
paint_mouse_pointer(image, s, pointer_x, pointer_y);
paint_mouse_pointer(image, s);
}