128 lines
3.4 KiB
C
128 lines
3.4 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 (!pixels)
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return;
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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 (!xc)
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return;
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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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if (!data->tex)
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return;
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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_blend_state_push();
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gs_blend_function(GS_BLEND_SRCALPHA, GS_BLEND_INVSRCALPHA);
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gs_enable_color(true, true, true, false);
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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_draw_sprite(data->tex, 0, 0, 0);
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gs_matrix_pop();
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gs_enable_color(true, true, true, true);
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gs_blend_state_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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