diff options
-rw-r--r-- | src/vga.c | 19 | ||||
-rw-r--r-- | src/vga.h | 2 |
2 files changed, 21 insertions, 0 deletions
@@ -101,6 +101,25 @@ void blit(const uint8_t *sprite, const Rect *dst) } } +void blitrc(const uint8_t *sprite, const Rect *src, const Rect *dst) +{ + for (int32_t j = dst->y * 320, sy = src->y * src->w; j < (dst->y + dst->h) * 320; j += 320, sy += src->w) + for (int16_t i = dst->x, sx = src->x; i < dst->x + dst->w; i++, sx++) + { + uint8_t b = sprite[sx + sy]; + + /* transparent */ + if (b == TRANSPARENT) + continue; + + /* clipping */ + if (i < 0 || i >= 320 || j < 0 || j >= 200 * 320) + continue; + + buffer[i + j] = b; + } +} + void blit_erase(uint8_t c) { memset(buffer, c, 320 * 200); @@ -21,6 +21,8 @@ void wait_vsync(); void set_palette(const uint8_t *palette); void blit(const uint8_t *sprite, const Rect *dst); +/* in src w is sprite width, h is sprite height */ +void blitrc(const uint8_t *sprite, const Rect *src, const Rect *dst); void blit_erase(uint8_t c); void blit_update(); |