void area_changed(MyPaintTiledSurface *tiled_surface, int bb_x, int bb_y, int bb_w, int bb_h)
{
MyPaintPythonTiledSurface *self = (MyPaintPythonTiledSurface *)tiled_surface;
ExpandRectToIncludePoint (&self->dirty_bbox, bb_x, bb_y);
ExpandRectToIncludePoint (&self->dirty_bbox, bb_x+bb_w-1, bb_y+bb_h-1);
}
// returns true if the surface was modified
bool draw_dab (float x, float y,
float radius,
float color_r, float color_g, float color_b,
float opaque, float hardness = 0.5,
float color_a = 1.0,
float aspect_ratio = 1.0, float angle = 0.0,
float lock_alpha = 0.0
) {
opaque = CLAMP(opaque, 0.0, 1.0);
hardness = CLAMP(hardness, 0.0, 1.0);
lock_alpha = CLAMP(lock_alpha, 0.0, 1.0);
if (radius < 0.1) return false; // don't bother with dabs smaller than 0.1 pixel
if (hardness == 0.0) return false; // infintly small center point, fully transparent outside
if (opaque == 0.0) return false;
assert(atomic > 0);
color_r = CLAMP(color_r, 0.0, 1.0);
color_g = CLAMP(color_g, 0.0, 1.0);
color_b = CLAMP(color_b, 0.0, 1.0);
color_a = CLAMP(color_a, 0.0, 1.0);
uint16_t color_r_ = color_r * (1<<15);
uint16_t color_g_ = color_g * (1<<15);
uint16_t color_b_ = color_b * (1<<15);
// blending mode preparation
float normal = 1.0;
normal *= 1.0-lock_alpha;
if (aspect_ratio<1.0) aspect_ratio=1.0;
float r_fringe = radius + 1;
int tx1 = floor(floor(x - r_fringe) / TILE_SIZE);
int tx2 = floor(floor(x + r_fringe) / TILE_SIZE);
int ty1 = floor(floor(y - r_fringe) / TILE_SIZE);
int ty2 = floor(floor(y + r_fringe) / TILE_SIZE);
int tx, ty;
for (ty = ty1; ty <= ty2; ty++) {
for (tx = tx1; tx <= tx2; tx++) {
uint16_t * rgba_p = get_tile_memory(tx, ty, false);
if (!rgba_p) {
printf("Python exception during draw_dab()!\n");
return true;
}
// first, we calculate the mask (opacity for each pixel)
static uint16_t mask[TILE_SIZE*TILE_SIZE+2*TILE_SIZE];
render_dab_mask(mask,
x - tx*TILE_SIZE,
y - ty*TILE_SIZE,
radius,
hardness,
aspect_ratio, angle
);
// second, we use the mask to stamp a dab for each activated blend mode
if (normal) {
if (color_a == 1.0) {
draw_dab_pixels_BlendMode_Normal(mask, rgba_p,
color_r_, color_g_, color_b_, normal*opaque*(1<<15));
} else {
// normal case for brushes that use smudging (eg. watercolor)
draw_dab_pixels_BlendMode_Normal_and_Eraser(mask, rgba_p,
color_r_, color_g_, color_b_, color_a*(1<<15), normal*opaque*(1<<15));
}
}
if (lock_alpha) {
draw_dab_pixels_BlendMode_LockAlpha(mask, rgba_p,
color_r_, color_g_, color_b_, lock_alpha*opaque*(1<<15));
}
}
}
{
// expand the bounding box to include the region we just drawed
int bb_x, bb_y, bb_w, bb_h;
bb_x = floor (x - (radius+1));
bb_y = floor (y - (radius+1));
/* FIXME: think about it exactly */
bb_w = ceil (2*(radius+1));
bb_h = ceil (2*(radius+1));
ExpandRectToIncludePoint (&dirty_bbox, bb_x, bb_y);
ExpandRectToIncludePoint (&dirty_bbox, bb_x+bb_w-1, bb_y+bb_h-1);
}
return true;
}
