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added dimRect and use it

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dimRect might be useful if we want to display status messages over
content (as opposed to erasing background)
This commit is contained in:
Dobrica Pavlinusic
2012-04-09 15:52:36 +02:00
parent 5d9176907f
commit 9dd9df0356
3 changed files with 66 additions and 4 deletions
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62
blitbuffer.c
View File

@@ -423,6 +423,67 @@ static int invertRect(lua_State *L) {
return 0;
}
static int dimRect(lua_State *L) {
BlitBuffer *dst = (BlitBuffer*) luaL_checkudata(L, 1, "blitbuffer");
int x = luaL_checkint(L, 2);
int y = luaL_checkint(L, 3);
int w = luaL_checkint(L, 4);
int h = luaL_checkint(L, 5);
uint8_t *dstptr;
int cy, cx;
if(w <= 0 || h <= 0 || x >= dst->w || y >= dst->h) {
return 0;
}
if(x + w > dst->w) {
w = dst->w - x;
}
if(y + h > dst->h) {
h = dst->h - y;
}
if(x & 1) {
/* This will invert 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);
for(cy = 0; cy < h; cy++) {
int px = *dstptr & 0x0F;
*dstptr &= 0xF0 | px << 1;
dstptr += dst->pitch;
}
x++;
w--;
}
dstptr = (uint8_t*)(dst->data +
y * dst->pitch +
x / 2);
for(cy = 0; cy < h; cy++) {
for(cx = 0; cx < w/2; cx++) {
*(dstptr+cx) =
*(dstptr+cx) >> 1 & 0xF0 |
*(dstptr+cx) & 0x0F >> 1;
}
dstptr += dst->pitch;
}
if(w & 1) {
/* This will invert 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) / 2);
for(cy = 0; cy < h; cy++) {
int px = *dstptr & 0xF0;
*dstptr &= 0x0F | ( px >> 1 & 0xF0 );
dstptr += dst->pitch;
}
}
return 0;
}
static const struct luaL_Reg blitbuffer_func[] = {
{"new", newBlitBuffer},
{NULL, NULL}
@@ -436,6 +497,7 @@ static const struct luaL_Reg blitbuffer_meth[] = {
{"blitFullFrom", blitFullToBuffer},
{"paintRect", paintRect},
{"invertRect", invertRect},
{"dimRect", dimRect},
{"free", freeBlitBuffer},
{"__gc", freeBlitBuffer},
{NULL, NULL}

4
crereader.lua
View File

@@ -104,9 +104,9 @@ function CREReader:goto(pos, pos_type)
print("## self.show_overlap "..self.show_overlap)
if self.show_overlap < 0 then
fb.bb:invertRect(0,0, width, -self.show_overlap)
fb.bb:dimRect(0,0, width, -self.show_overlap)
elseif self.show_overlap > 0 then
fb.bb:invertRect(0,height - self.show_overlap, width, self.show_overlap)
fb.bb:dimRect(0,height - self.show_overlap, width, self.show_overlap)
end
self.show_overlap = 0

4
unireader.lua
View File

@@ -555,9 +555,9 @@ function UniReader:show(no)
print("## self.show_overlap "..self.show_overlap)
if self.show_overlap < 0 then
fb.bb:invertRect(0,0, width, dest_y - self.show_overlap)
fb.bb:dimRect(0,0, width, dest_y - self.show_overlap)
elseif self.show_overlap > 0 then
fb.bb:invertRect(0,dest_y + height - self.show_overlap, width, self.show_overlap)
fb.bb:dimRect(0,dest_y + height - self.show_overlap, width, self.show_overlap)
end
self.show_overlap = 0