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render: add trapezoid helper functions

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Add functions to create shapes like rectangles and circles using xcb
trapezoids.

Contributed-by: Samuel Hand <samuel.d.hand@gmail.com>
This commit is contained in:
Yuxuan Shui
2020-08-19 19:11:38 +01:00
parent 2b677c8fc4
commit 4c1360f92a
1 changed files with 44 additions and 0 deletions
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44
src/render.c
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@@ -185,6 +185,50 @@ void free_paint(session_t *ps, paint_t *ppaint) {
ppaint->pixmap = XCB_NONE;
}
uint32_t
make_circle(int cx, int cy, int radius, uint32_t max_ntraps, xcb_render_trapezoid_t traps[]) {
uint32_t n = 0, k = 0;
int y1, y2;
double w;
while (k < max_ntraps) {
y1 = (int)(-radius * cos(M_PI * k / max_ntraps));
traps[n].top = (cy + y1) << 16;
traps[n].left.p1.y = (cy + y1) << 16;
traps[n].right.p1.y = (cy + y1) << 16;
w = sqrt(radius * radius - y1 * y1) * 65536;
traps[n].left.p1.x = (int)((cx << 16) - w);
traps[n].right.p1.x = (int)((cx << 16) + w);
do {
k++;
y2 = (int)(-radius * cos(M_PI * k / max_ntraps));
} while (y1 == y2);
traps[n].bottom = (cy + y2) << 16;
traps[n].left.p2.y = (cy + y2) << 16;
traps[n].right.p2.y = (cy + y2) << 16;
w = sqrt(radius * radius - y2 * y2) * 65536;
traps[n].left.p2.x = (int)((cx << 16) - w);
traps[n].right.p2.x = (int)((cx << 16) + w);
n++;
}
return n;
}
uint32_t make_rectangle(int x, int y, int wid, int hei, xcb_render_trapezoid_t traps[]) {
traps[0].top = y << 16;
traps[0].left.p1.y = y << 16;
traps[0].left.p1.x = x << 16;
traps[0].left.p2.y = (y + hei) << 16;
traps[0].left.p2.x = x << 16;
traps[0].bottom = (y + hei) << 16;
traps[0].right.p1.x = (x + wid) << 16;
traps[0].right.p1.y = y << 16;
traps[0].right.p2.x = (x + wid) << 16;
traps[0].right.p2.y = (y + hei) << 16;
return 1;
}
void render(session_t *ps, int x, int y, int dx, int dy, int wid, int hei, double opacity,
bool argb, bool neg, xcb_render_picture_t pict, glx_texture_t *ptex,
const region_t *reg_paint, const glx_prog_main_t *pprogram) {