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fix: bug in paintRect

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When calculating index of byte for rightmost column,
it should be (x + w)/2 not (x + w + 1)/2.
This commit is contained in:
Qingping Hou 2012-03-06 11:10:20 +08:00
parent a30e92b7a4
commit 936ce2d661
1 changed files with 7 additions and 2 deletions
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9
blitbuffer.c
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@ -302,7 +302,9 @@ static int paintRect(lua_State *L) {
}
if(x & 1) {
/* this will render the leftmost column */
/* This will render the leftmost column
* in the case when x is odd. After this,
* x will become even. */
dstptr = (uint8_t*)(dst->data +
y * dst->pitch +
x / 2);
@ -322,9 +324,12 @@ static int paintRect(lua_State *L) {
dstptr += dst->pitch;
}
if(w & 1) {
/* This will render the rightmost column
* in the case when (w & 1) && !(x & 1) or
* !(w & 1) && (x & 1). */
dstptr = (uint8_t*)(dst->data +
y * dst->pitch +
(x + w + 1) / 2);
(x + w) / 2);
for(cy = 0; cy < h; cy++) {
*dstptr &= 0x0F;
*dstptr |= (c << 4);