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[Kandinsky] Take the origin into account

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This commit is contained in:
Romain Goyet
2015-09-02 19:23:14 +02:00
parent 7a5893ff05
commit f8048ead96
1 changed files with 9 additions and 5 deletions
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14
kandinsky/src/pixel.c
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@@ -26,11 +26,15 @@ KDPoint KDGetOrigin() {
}
void KDSetPixel(KDPoint p, KDColor c) {
assert(p.x >= 0);
assert(p.x < KD_FRAMEBUFFER_WIDTH);
assert(p.y >= 0);
assert(p.y < KD_FRAMEBUFFER_HEIGHT);
int pixels_offset = p.y*(KD_FRAMEBUFFER_WIDTH) + p.x;
KDPoint t = {
.x = p.x + sOrigin.x,
.y = p.y + sOrigin.y
};
assert(t.x >= 0);
assert(t.x < KD_FRAMEBUFFER_WIDTH);
assert(t.y >= 0);
assert(t.y < KD_FRAMEBUFFER_HEIGHT);
int pixels_offset = t.y*(KD_FRAMEBUFFER_WIDTH) + t.x;
int bits_offset = (KD_BITS_PER_PIXEL)*pixels_offset;
const uint8_t color_bitsize = 8*sizeof(KDColor);
// Notice: the "const" here is rather important. Indeed, it hints the compiler