Added initial Mouse pointer lib

Added library to get the mouse pointer with the XFixes
extension and draw it via a sprite.

test/linux/CMakeLists.txt

@@ -3,14 +3,15 @@ project(linux)
 find_package(X11 REQUIRED)
 
 include_directories(SYSTEM "${CMAKE_SOURCE_DIR}/libobs")
-#include_directories(SYSTEM "${CMAKE_SOURCE_DIR}/libobs-opengl")
 
 set(linux_SOURCES
     linux.c
+    xcursor.c
     xshm-input.c
 )
 set(linux_HEADERS
     linux.h
+    xcursor.h
     xshm-input.h
 )
     
@@ -22,8 +23,7 @@ target_link_libraries(linux
     libobs
     ${X11_LIBRARIES}
     ${X11_XShm_LIB}
+    ${X11_Xfixes_LIB}
 )
 
 install_obs_plugin(linux)
-
-#obs_fixup_install_target(xshm-input PATH ${Libx264_LIBRARIES})

test/linux/xcursor.c

@@ -0,0 +1,94 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <X11/extensions/Xfixes.h>
+#include "xcursor.h"
+
+uint32_t *xcursor_pixels(XFixesCursorImage *xc) {
+    int size = xc->width * xc->height;
+    uint32_t *pixels = bmalloc(size * 4);
+    
+    // pixel data from XFixes is defined as unsigned long ...
+    // TODO: check why everybody is making a fuss about this
+    for (int i = 0; i < size; ++i)
+        pixels[i] = (uint32_t) xc->pixels[i];
+    
+    return pixels;
+}
+
+void xcursor_create(xcursor_t *data, XFixesCursorImage *xc) {
+    // get cursor pixel data
+    uint32_t *pixels = xcursor_pixels(xc);
+    
+    // if the cursor has the same size as the last one we can simply update
+    if (data->tex
+     && data->last_height == xc->width
+     && data->last_width == xc->height) {
+        texture_setimage(data->tex, (void **) pixels, xc->width * 4, False);
+    }
+    else {
+        if (data->tex)
+            texture_destroy(data->tex);
+        
+        data->tex = gs_create_texture(
+            xc->width, xc->height,
+            GS_RGBA, 1,
+            (const void **) &pixels,
+            GS_DYNAMIC
+        );
+    }
+    bfree(pixels);
+    
+    // set some data
+    data->last_serial = xc->cursor_serial;
+    data->last_width = xc->width;
+    data->last_height = xc->height;
+}
+
+xcursor_t *xcursor_init(Display *dpy) {
+    xcursor_t *data = bmalloc(sizeof(xcursor_t));
+    memset(data, 0, sizeof(xcursor_t));
+    
+    data->dpy = dpy;
+    
+    return data;
+}
+
+void xcursor_destroy(xcursor_t *data) {
+    if (data->tex)
+        texture_destroy(data->tex);
+    bfree(data);
+}
+
+void xcursor_render(xcursor_t *data) {
+    // get cursor data
+    XFixesCursorImage *xc = XFixesGetCursorImage(data->dpy);
+    
+    // update cursor if necessary
+    if (!data->tex || data->last_serial != xc->cursor_serial)
+        xcursor_create(data, xc);
+    
+    // TODO: why do i need effects ?
+    effect_t effect  = gs_geteffect();
+    eparam_t diffuse = effect_getparambyname(effect, "diffuse");
+
+    effect_settexture(effect, diffuse, data->tex);
+    
+    gs_matrix_push();
+    
+    // move cursor to the right position
+    gs_matrix_translate3f(
+        -1.0 * (xc->x - xc->xhot),
+        -1.0 * (xc->y - xc->yhot),
+        0
+    );
+    
+    // blend cursor
+    gs_enable_blending(True);
+    gs_blendfunction(GS_BLEND_ONE, GS_BLEND_INVSRCALPHA);
+    gs_draw_sprite(data->tex, 0, 0, 0);
+    gs_enable_blending(False);
+    
+    gs_matrix_pop();
+    
+    XFree(xc);
+}

test/linux/xcursor.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <obs.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+    Display *dpy;
+    unsigned long last_serial;
+    short unsigned int last_width;
+    short unsigned int last_height;
+    texture_t tex;
+} xcursor_t;
+
+/**
+ * Initializes the xcursor object
+ */
+xcursor_t *xcursor_init(Display *dpy);
+
+/**
+ * Destroys the xcursor object
+ */
+void xcursor_destroy(xcursor_t *data);
+
+/**
+ * Draw the cursor
+ * 
+ * This needs to be executed within a valid render context
+ */
+void xcursor_render(xcursor_t *data);
+
+#ifdef __cplusplus
+}
+#endif

test/linux/xshm-input.c

@@ -4,6 +4,7 @@
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <X11/extensions/XShm.h>
+#include "xcursor.h"
 #include "xshm-input.h"
 
 struct xshm_data {
@@ -17,6 +18,7 @@ struct xshm_data {
     XShmSegmentInfo shm_info;
     XImage *image;
     texture_t texture;
+    xcursor_t *cursor;
 };
 
 const char* xshm_input_getname(const char* locale)
@@ -53,45 +55,36 @@ struct xshm_data *xshm_input_create(const char *settings, obs_source_t source)
     if (!data->image)
         goto fail;
     
-    printf("Image size: %dx%d\n", data->image->width, data->image->height);
-    
     // create shared memory
     data->shm_info.shmid = shmget(IPC_PRIVATE, data->image->bytes_per_line *
                                   data->image->height, IPC_CREAT | 0700);
-    if (data->shm_info.shmid < 0) {
-        printf("Failed to create shared memory !\n");
+    if (data->shm_info.shmid < 0)
         goto fail;
-    }
     
     // attach shared memory
     data->shm_info.shmaddr = data->image->data 
                            = (char *) shmat(data->shm_info.shmid, 0, 0);
-    if (data->shm_info.shmaddr == (char *) -1) {
-        printf("Failed to attach shared memory !\n");
+    if (data->shm_info.shmaddr == (char *) -1)
         goto fail;
-    }
     // set shared memory as read only
     data->shm_info.readOnly = False;
     
     // attach shm
-    if (!XShmAttach(data->dpy, &data->shm_info)) {
-        printf("Failed to attach to XShm !\n");
+    if (!XShmAttach(data->dpy, &data->shm_info))
         goto fail;
-    }
     data->shm_attached = 1;
 
     // get image
     if (!XShmGetImage(data->dpy, data->root_window, data->image,
-                      0, 0, AllPlanes)) {
-        printf("Failed to get image data !\n");
+                      0, 0, AllPlanes))
         goto fail;
-    }
 
     // create obs texture    
     gs_entercontext(obs_graphics());
     data->texture = gs_create_texture(data->width, data->height, GS_BGRA, 1,
                                       (const void**) &data->image->data,
                                       GS_DYNAMIC);
+    data->cursor = xcursor_init(data->dpy);
     gs_leavecontext();
     
     if (!data->texture)
@@ -111,6 +104,7 @@ void xshm_input_destroy(struct xshm_data *data)
         gs_entercontext(obs_graphics());
 
         texture_destroy(data->texture);
+        xcursor_destroy(data->cursor);
 
         gs_leavecontext();
         
@@ -148,18 +142,18 @@ uint32_t xshm_input_get_output_flags(struct xshm_data *data)
 void xshm_input_video_render(struct xshm_data *data, obs_source_t filter_target)
 {
     // update texture
-    if (!XShmGetImage(data->dpy, data->root_window, data->image,
-                      0, 0, AllPlanes)) {
-        printf("Failed to get image !\n");
-    }
+    XShmGetImage(data->dpy, data->root_window, data->image, 0, 0, AllPlanes);
     texture_setimage(data->texture, (void *) data->image->data,
                      data->width * 4, False);
     
-    //effect_t effect  = gs_geteffect();
-    //eparam_t diffuse = effect_getparambyname(effect, "diffuse");
+    effect_t effect  = gs_geteffect();
+    eparam_t diffuse = effect_getparambyname(effect, "diffuse");
 
-    //effect_settexture(effect, diffuse, data->texture);
+    effect_settexture(effect, diffuse, data->texture);
     gs_draw_sprite(data->texture, 0, 0, 0);
+    
+    // render the cursor
+    xcursor_render(data->cursor);
 }
 
 uint32_t xshm_input_getwidth(struct xshm_data *data)