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[libcg]fix blend_transformed_argb

This commit is contained in:
JianjunJiang 2021-12-13 14:59:39 +08:00
parent 25c0b9b7e9
commit b11adcd38e
1 changed files with 5 additions and 6 deletions
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11
src/cg.c
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@ -1938,7 +1938,6 @@ static inline void blend_transformed_argb(struct cg_surface_t * surface, enum cg
while(count--) while(count--)
{ {
uint32_t * target = (uint32_t *)(surface->pixels + spans->y * surface->stride) + spans->x; uint32_t * target = (uint32_t *)(surface->pixels + spans->y * surface->stride) + spans->x;
double cx = spans->x + 0.5; double cx = spans->x + 0.5;
double cy = spans->y + 0.5; double cy = spans->y + 0.5;
int x = (int)((texture->matrix.c * cy + texture->matrix.a * cx + texture->matrix.tx) * FIXED_SCALE); int x = (int)((texture->matrix.c * cy + texture->matrix.a * cx + texture->matrix.tx) * FIXED_SCALE);
@ -1952,12 +1951,12 @@ static inline void blend_transformed_argb(struct cg_surface_t * surface, enum cg
uint32_t * b = buffer; uint32_t * b = buffer;
while(b < end) while(b < end)
{ {
int px = CG_CLAMP(x >> 16, 0, image_width - 1); int px = x >> 16;
int py = CG_CLAMP(y >> 16, 0, image_height - 1); int py = y >> 16;
if((px == (x >> 16)) && (py == (y >> 16))) if((px < 0) || (px >= image_width) || (py < 0) || (py >= image_height))
*b = ((uint32_t *)(texture->pixels + py * texture->stride))[px];
else
*b = 0; *b = 0;
else
*b = ((uint32_t *)(texture->pixels + py * texture->stride))[px];
x += fdx; x += fdx;
y += fdy; y += fdy;
++b; ++b;