static void
gimp_ink_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
const GimpCoords *coords,
guint32 time)
{
GimpInk *ink = GIMP_INK (paint_core);
GimpInkOptions *options = GIMP_INK_OPTIONS (paint_options);
GimpContext *context = GIMP_CONTEXT (paint_options);
GimpImage *image;
GimpBlob *blob_union = NULL;
GimpBlob *blob_to_render;
TempBuf *area;
guchar col[MAX_CHANNELS];
PixelRegion blob_maskPR;
image = gimp_item_get_image (GIMP_ITEM (drawable));
if (! ink->last_blob)
{
ink->last_blob = ink_pen_ellipse (options,
coords->x,
coords->y,
coords->pressure,
coords->xtilt,
coords->ytilt,
100);
if (ink->start_blob)
g_free (ink->start_blob);
ink->start_blob = gimp_blob_duplicate (ink->last_blob);
blob_to_render = ink->last_blob;
}
else
{
GimpBlob *blob = ink_pen_ellipse (options,
coords->x,
coords->y,
coords->pressure,
coords->xtilt,
coords->ytilt,
coords->velocity * 100);
blob_union = gimp_blob_convex_union (ink->last_blob, blob);
g_free (ink->last_blob);
ink->last_blob = blob;
blob_to_render = blob_union;
}
/* Get the buffer */
ink->cur_blob = blob_to_render;
area = gimp_paint_core_get_paint_area (paint_core, drawable, paint_options,
coords);
ink->cur_blob = NULL;
if (! area)
return;
gimp_image_get_foreground (image, context, gimp_drawable_type (drawable),
col);
/* set the alpha channel */
col[paint_core->canvas_buf->bytes - 1] = OPAQUE_OPACITY;
/* color the pixels */
color_pixels (temp_buf_get_data (paint_core->canvas_buf), col,
area->width * area->height, area->bytes);
gimp_paint_core_validate_canvas_tiles (paint_core,
paint_core->canvas_buf->x,
paint_core->canvas_buf->y,
paint_core->canvas_buf->width,
paint_core->canvas_buf->height);
/* draw the blob directly to the canvas_tiles */
pixel_region_init (&blob_maskPR, paint_core->canvas_tiles,
paint_core->canvas_buf->x,
paint_core->canvas_buf->y,
paint_core->canvas_buf->width,
paint_core->canvas_buf->height,
TRUE);
render_blob (blob_to_render, &blob_maskPR);
/* draw the canvas_buf using the just rendered canvas_tiles as mask */
pixel_region_init (&blob_maskPR, paint_core->canvas_tiles,
paint_core->canvas_buf->x,
paint_core->canvas_buf->y,
paint_core->canvas_buf->width,
paint_core->canvas_buf->height,
FALSE);
gimp_paint_core_paste (paint_core, &blob_maskPR, drawable,
GIMP_OPACITY_OPAQUE,
gimp_context_get_opacity (context),
gimp_context_get_paint_mode (context),
GIMP_PAINT_CONSTANT);
if (blob_union)
g_free (blob_union);
}
void
_gimp_paintbrush_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options,
gdouble opacity)
{
GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paint_core);
GimpContext *context = GIMP_CONTEXT (paint_options);
GimpPressureOptions *pressure_options = paint_options->pressure_options;
GimpImage *image;
GimpRGB gradient_color;
TempBuf *area;
guchar col[MAX_CHANNELS];
GimpPaintApplicationMode paint_appl_mode;
image = gimp_item_get_image (GIMP_ITEM (drawable));
opacity *= gimp_paint_options_get_fade (paint_options, image,
paint_core->pixel_dist);
if (opacity == 0.0)
return;
paint_appl_mode = paint_options->application_mode;
area = gimp_paint_core_get_paint_area (paint_core, drawable, paint_options);
if (! area)
return;
/* optionally take the color from the current gradient */
if (gimp_paint_options_get_gradient_color (paint_options, image,
paint_core->cur_coords.pressure,
paint_core->pixel_dist,
&gradient_color))
{
opacity *= gradient_color.a;
gimp_rgb_get_uchar (&gradient_color,
&col[RED_PIX],
&col[GREEN_PIX],
&col[BLUE_PIX]);
col[ALPHA_PIX] = OPAQUE_OPACITY;
color_pixels (temp_buf_data (area), col,
area->width * area->height,
area->bytes);
paint_appl_mode = GIMP_PAINT_INCREMENTAL;
}
/* otherwise check if the brush has a pixmap and use that to color the area */
else if (brush_core->brush && brush_core->brush->pixmap)
{
gimp_brush_core_color_area_with_pixmap (brush_core, drawable,
area,
gimp_paint_options_get_brush_mode (paint_options));
paint_appl_mode = GIMP_PAINT_INCREMENTAL;
}
/* otherwise fill the area with the foreground color */
else
{
gimp_image_get_foreground (image, context, gimp_drawable_type (drawable),
col);
col[area->bytes - 1] = OPAQUE_OPACITY;
color_pixels (temp_buf_data (area), col,
area->width * area->height,
area->bytes);
}
if (paint_core->use_pressure && pressure_options->opacity)
opacity *= PRESSURE_SCALE * paint_core->cur_coords.pressure;
/* finally, let the brush core paste the colored area on the canvas */
gimp_brush_core_paste_canvas (brush_core, drawable,
MIN (opacity, GIMP_OPACITY_OPAQUE),
gimp_context_get_opacity (context),
gimp_context_get_paint_mode (context),
gimp_paint_options_get_brush_mode (paint_options),
paint_appl_mode);
}