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c9df41c1e2
Typedef pointers are unsafe. If you do: typedef struct bla *bla_t; then you cannot use it as a constant, such as: const bla_t, because that constant will be to the pointer itself rather than to the underlying data. I admit this was a fundamental mistake that must be corrected. All typedefs that were pointer types will now have their pointers removed from the type itself, and the pointers will be used when they are actually used as variables/parameters/returns instead. This does not break ABI though, which is pretty nice.
118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*
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Copyright (C) 2014 by Leonhard Oelke <leonhard@in-verted.de>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <X11/extensions/Xfixes.h>
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#include <util/bmem.h>
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#include "xcursor.h"
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/*
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* Get pixel data for the cursor
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*
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* XFixes has the data defined as unsigned long, so we can not use memcpy.
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* Theres a lot of talk about this in other implementation and they tend to
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* be really complicated, but this naive approach seems to work fine ...
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*/
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static uint32_t *xcursor_pixels(XFixesCursorImage *xc) {
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uint_fast32_t size = xc->width * xc->height;
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uint32_t *pixels = bmalloc(size * sizeof(uint32_t));
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for (uint_fast32_t i = 0; i < size; ++i)
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pixels[i] = (uint32_t) xc->pixels[i];
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return pixels;
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}
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/*
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* Create the cursor texture, either by updating if the new cursor has the same
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* size or by creating a new texture if the size is different
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*/
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static void xcursor_create(xcursor_t *data, XFixesCursorImage *xc) {
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uint32_t *pixels = xcursor_pixels(xc);
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if (data->tex
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&& data->last_height == xc->width
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&& data->last_width == xc->height) {
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gs_texture_set_image(data->tex, (const uint8_t *) pixels,
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xc->width * sizeof(uint32_t), False);
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} else {
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if (data->tex)
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gs_texture_destroy(data->tex);
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data->tex = gs_texture_create(xc->width, xc->height,
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GS_BGRA, 1, (const uint8_t **) &pixels, GS_DYNAMIC);
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}
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bfree(pixels);
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data->last_serial = xc->cursor_serial;
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data->last_width = xc->width;
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data->last_height = xc->height;
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}
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xcursor_t *xcursor_init(Display *dpy) {
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xcursor_t *data = bzalloc(sizeof(xcursor_t));
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data->dpy = dpy;
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xcursor_tick(data);
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return data;
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}
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void xcursor_destroy(xcursor_t *data) {
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if (data->tex)
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gs_texture_destroy(data->tex);
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bfree(data);
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}
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void xcursor_tick(xcursor_t *data) {
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XFixesCursorImage *xc = XFixesGetCursorImage(data->dpy);
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if (!data->tex || data->last_serial != xc->cursor_serial)
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xcursor_create(data, xc);
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data->x = (int_fast32_t)xc->x - (int_fast32_t)data->x_org;
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data->y = (int_fast32_t)xc->y - (int_fast32_t)data->y_org;
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data->render_x = xc->x - xc->xhot - data->x_org;
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data->render_y = xc->y - xc->yhot - data->y_org;
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XFree(xc);
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}
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void xcursor_render(xcursor_t *data) {
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gs_effect_t *effect = gs_get_effect();
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gs_eparam_t *image = gs_effect_get_param_by_name(effect, "image");
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gs_effect_set_texture(image, data->tex);
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gs_matrix_push();
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gs_matrix_translate3f(data->render_x, data->render_y, 0.0f);
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gs_enable_blending(True);
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gs_blend_function(GS_BLEND_ONE, GS_BLEND_INVSRCALPHA);
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gs_draw_sprite(data->tex, 0, 0, 0);
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gs_matrix_pop();
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}
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void xcursor_offset(xcursor_t* data, int_fast32_t x_org, int_fast32_t y_org)
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{
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data->x_org = x_org;
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data->y_org = y_org;
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}
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