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TileAtlasVX: Followup fix

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Use rectangle intersection to correctly clip source
rectangles with origin != (0,0).
This commit is contained in:
Jonas Kulla 2014-10-03 06:51:39 +02:00
parent db78e55371
commit 55a2cf562e
2 changed files with 27 additions and 14 deletions
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17
src/etc-internal.h
View file

@ -93,17 +93,20 @@ struct Vec2i
} }
}; };
struct IntRect struct IntRect : SDL_Rect
{ {
int x, y, w, h;
IntRect() IntRect()
: x(0), y(0), w(0), h(0) {
{} x = y = w = h = 0;
}
IntRect(int x, int y, int w, int h) IntRect(int x, int y, int w, int h)
: x(x), y(y), w(w), h(h) {
{} this->x = x;
this->y = y;
this->w = w;
this->h = h;
}
bool operator==(const IntRect &other) const bool operator==(const IntRect &other) const
{ {

24
src/tileatlasvx.cpp
View file

@ -270,6 +270,20 @@ createShadowSet()
return surf; return surf;
} }
static void doBlit(Bitmap *bm, const IntRect &src, const Vec2i &dst)
{
/* Translate tile to pixel units */
IntRect _src(src.x*32, src.y*32, src.w*32, src.h*32);
Vec2i _dst(dst.x*32, dst.y*32);
IntRect bmr(0, 0, bm->width(), bm->height());
/* Drop blit if source rect lies outside bitmap rect */
if (!SDL_IntersectRect(&_src, &bmr, &_src))
return;
GLMeta::blitRectangle(_src, _dst);
}
void build(TEXFBO &tf, Bitmap *bitmaps[BM_COUNT]) void build(TEXFBO &tf, Bitmap *bitmaps[BM_COUNT])
{ {
assert(tf.width == ATLASVX_W && tf.height == ATLASVX_H); assert(tf.width == ATLASVX_W && tf.height == ATLASVX_H);
@ -296,13 +310,9 @@ void build(TEXFBO &tf, Bitmap *bitmaps[BM_COUNT])
GLMeta::blitSource(bm->getGLTypes()); \ GLMeta::blitSource(bm->getGLTypes()); \
for (size_t i = 0; i < blits##part##N; ++i) \ for (size_t i = 0; i < blits##part##N; ++i) \
{\ {\
IntRect src = blits##part[i].src; \ const IntRect &src = blits##part[i].src; \
int w = std::min(bm->width(), src.w*32); \ const Vec2i &dst = blits##part[i].dst; \
int h = std::min(bm->height(), src.h*32); \ doBlit(bm, src, dst); \
src = IntRect(src.x*32, src.y*32, w, h); \
Vec2i dst = blits##part[i].dst; \
dst = Vec2i(dst.x*32, dst.y*32); \
GLMeta::blitRectangle(src, dst); \
} \ } \
} }