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Fix overflow and scaling in Linux 8-bit blitting code.

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This commit is contained in:
TomW 2016-02-01 20:44:48 +00:00
commit b38a3fd838
1 changed files with 24 additions and 6 deletions
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30
src/allegro-video.c
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@ -82,6 +82,7 @@ static void allegro_blit_memtoscreen(int x, int y, int y1, int y2, int w, int h)
static void allegro_blit_memtoscreen_8(int x, int y, int w, int h)
{
int xx, yy;
int line_double = (winsizey > h) ? 1 : 0;
if (y < 0)
{
@ -91,19 +92,36 @@ static void allegro_blit_memtoscreen_8(int x, int y, int w, int h)
for (yy = y; yy < y+h; yy++)
{
int dy = yy*2;
for (xx = x; xx < x+w; xx++)
int dy = line_double ? yy*2 : yy;
if (dy < buffer->h)
{
((uint32_t *)buffer32->line[dy])[xx] =
((uint32_t *)buffer32->line[dy + 1])[xx] = pal_lookup[buffer->line[yy][xx]];
if (line_double)
{
for (xx = x; xx < x+w; xx++)
{
((uint32_t *)buffer32->line[dy])[xx] =
((uint32_t *)buffer32->line[dy + 1])[xx] = pal_lookup[buffer->line[yy][xx]];
}
}
else
{
for (xx = x; xx < x+w; xx++)
((uint32_t *)buffer32->line[dy])[xx] = pal_lookup[buffer->line[yy][xx]];
}
}
}
if (readflash)
{
rectfill(buffer32, x+SCREEN_W-40, y*2+8, SCREEN_W-8, y*2+14, makecol(255, 255, 255));
if (line_double)
rectfill(buffer32, x+SCREEN_W-40, y*2+8, SCREEN_W-8, y*2+14, makecol(255, 255, 255));
else
rectfill(buffer32, x+SCREEN_W-40, y+8, SCREEN_W-8, y+14, makecol(255, 255, 255));
readflash = 0;
}
blit(buffer32, screen, x, y*2, 0, 0, w, h*2);
if (line_double)
blit(buffer32, screen, x, y*2, 0, 0, w, h*2);
else
blit(buffer32, screen, x, y, 0, 0, w, h);
}