/* Similar to gimp_drawable_apply_region but works in "replace" mode (i.e.
* transparent pixels in src2 make the result transparent rather than
* opaque.
*
* Takes an additional mask pixel region as well.
*/
void
gimp_drawable_real_replace_region (GimpDrawable *drawable,
PixelRegion *src2PR,
gboolean push_undo,
const gchar *undo_desc,
gdouble opacity,
PixelRegion *maskPR,
gint x,
gint y)
{
GimpItem *item = GIMP_ITEM (drawable);
GimpImage *image = gimp_item_get_image (item);
GimpChannel *mask = gimp_image_get_mask (image);
gint x1, y1, x2, y2;
gint offset_x, offset_y;
PixelRegion src1PR, destPR;
CombinationMode operation;
gboolean active_components[MAX_CHANNELS];
/* don't apply the mask to itself and don't apply an empty mask */
if (GIMP_DRAWABLE (mask) == drawable || gimp_channel_is_empty (mask))
mask = NULL;
/* configure the active channel array */
gimp_drawable_get_active_components (drawable, active_components);
/* determine what sort of operation is being attempted and
* if it's actually legal...
*/
operation = gimp_image_get_combination_mode (gimp_drawable_type (drawable),
src2PR->bytes);
if (operation == -1)
{
g_warning ("%s: illegal parameters.", G_STRFUNC);
return;
}
/* get the layer offsets */
gimp_item_get_offset (item, &offset_x, &offset_y);
/* make sure the image application coordinates are within drawable bounds */
x1 = CLAMP (x, 0, gimp_item_get_width (item));
y1 = CLAMP (y, 0, gimp_item_get_height (item));
x2 = CLAMP (x + src2PR->w, 0, gimp_item_get_width (item));
y2 = CLAMP (y + src2PR->h, 0, gimp_item_get_height (item));
if (mask)
{
GimpItem *mask_item = GIMP_ITEM (mask);
/* make sure coordinates are in mask bounds ...
* we need to add the layer offset to transform coords
* into the mask coordinate system
*/
x1 = CLAMP (x1, -offset_x, gimp_item_get_width (mask_item) - offset_x);
y1 = CLAMP (y1, -offset_y, gimp_item_get_height (mask_item) - offset_y);
x2 = CLAMP (x2, -offset_x, gimp_item_get_width (mask_item) - offset_x);
y2 = CLAMP (y2, -offset_y, gimp_item_get_height (mask_item) - offset_y);
}
/* If the calling procedure specified an undo step... */
if (push_undo)
gimp_drawable_push_undo (drawable, undo_desc,
x1, y1,
x2 - x1, y2 - y1,
NULL, FALSE);
/* configure the pixel regions */
pixel_region_init (&src1PR, gimp_drawable_get_tiles (drawable),
x1, y1, x2 - x1, y2 - y1,
FALSE);
pixel_region_init (&destPR, gimp_drawable_get_tiles (drawable),
x1, y1, x2 - x1, y2 - y1,
TRUE);
pixel_region_resize (src2PR,
src2PR->x + (x1 - x), src2PR->y + (y1 - y),
x2 - x1, y2 - y1);
if (mask)
{
PixelRegion mask2PR, tempPR;
guchar *temp_data;
pixel_region_init (&mask2PR,
gimp_drawable_get_tiles (GIMP_DRAWABLE (mask)),
x1 + offset_x,
y1 + offset_y,
x2 - x1, y2 - y1,
FALSE);
temp_data = g_malloc ((y2 - y1) * (x2 - x1));
pixel_region_init_data (&tempPR, temp_data, 1, x2 - x1,
0, 0, x2 - x1, y2 - y1);
copy_region (&mask2PR, &tempPR);
pixel_region_init_data (&tempPR, temp_data, 1, x2 - x1,
0, 0, x2 - x1, y2 - y1);
apply_mask_to_region (&tempPR, maskPR, OPAQUE_OPACITY);
pixel_region_init_data (&tempPR, temp_data, 1, x2 - x1,
0, 0, x2 - x1, y2 - y1);
combine_regions_replace (&src1PR, src2PR, &destPR, &tempPR, NULL,
opacity * 255.999,
active_components,
operation);
g_free (temp_data);
}
else
{
combine_regions_replace (&src1PR, src2PR, &destPR, maskPR, NULL,
opacity * 255.999,
active_components,
operation);
}
}
static void
gimp_smudge_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options)
{
GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
GimpSmudgeOptions *options = GIMP_SMUDGE_OPTIONS (paint_options);
GimpContext *context = GIMP_CONTEXT (paint_options);
GimpPressureOptions *pressure_options = paint_options->pressure_options;
GimpImage *image;
TempBuf *area;
PixelRegion srcPR, destPR, tempPR;
gdouble rate;
gdouble opacity;
gint x, y, w, h;
image = gimp_item_get_image (GIMP_ITEM (drawable));
if (gimp_drawable_is_indexed (drawable))
return;
opacity = gimp_paint_options_get_fade (paint_options, image,
paint_core->pixel_dist);
if (opacity == 0.0)
return;
/* Get the unclipped brush coordinates */
gimp_smudge_brush_coords (paint_core, &x, &y, &w, &h);
/* Get the paint area (Smudge won't scale!) */
area = gimp_paint_core_get_paint_area (paint_core, drawable, paint_options);
if (! area)
return;
/* srcPR will be the pixels under the current painthit from the drawable */
pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
area->x, area->y, area->width, area->height, FALSE);
/* Enable pressure sensitive rate */
if (pressure_options->rate)
rate = MIN (options->rate / 100.0 * PRESSURE_SCALE *
paint_core->cur_coords.pressure, 1.0);
else
rate = options->rate / 100.0;
/* The tempPR will be the built up buffer (for smudge) */
pixel_region_init_data (&tempPR, smudge->accum_data,
smudge->accumPR.bytes,
smudge->accumPR.rowstride,
area->x - x,
area->y - y,
area->width,
area->height);
/* The dest will be the paint area we got above (= canvas_buf) */
pixel_region_init_temp_buf (&destPR, area,
0, 0, area->width, area->height);
/* Smudge uses the buffer Accum.
* For each successive painthit Accum is built like this
* Accum = rate*Accum + (1-rate)*I.
* where I is the pixels under the current painthit.
* Then the paint area (canvas_buf) is built as
* (Accum,1) (if no alpha),
*/
blend_region (&srcPR, &tempPR, &tempPR, ROUND (rate * 255.0));
/* re-init the tempPR */
pixel_region_init_data (&tempPR, smudge->accum_data,
smudge->accumPR.bytes,
smudge->accumPR.rowstride,
area->x - x,
area->y - y,
area->width,
area->height);
if (! gimp_drawable_has_alpha (drawable))
add_alpha_region (&tempPR, &destPR);
else
copy_region (&tempPR, &destPR);
if (pressure_options->opacity)
opacity *= PRESSURE_SCALE * paint_core->cur_coords.pressure;
gimp_brush_core_replace_canvas (GIMP_BRUSH_CORE (paint_core), drawable,
MIN (opacity, GIMP_OPACITY_OPAQUE),
gimp_context_get_opacity (context),
gimp_paint_options_get_brush_mode (paint_options),
GIMP_PAINT_INCREMENTAL);
}
static void
gimp_convolve_motion (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options)
{
GimpConvolve *convolve = GIMP_CONVOLVE (paint_core);
GimpBrushCore *brush_core = GIMP_BRUSH_CORE (paint_core);
GimpConvolveOptions *options = GIMP_CONVOLVE_OPTIONS (paint_options);
GimpContext *context = GIMP_CONTEXT (paint_options);
GimpImage *image;
TempBuf *area;
PixelRegion srcPR;
PixelRegion destPR;
PixelRegion tempPR;
guchar *buffer;
gdouble opacity;
gdouble rate;
gint bytes;
image = gimp_item_get_image (GIMP_ITEM (drawable));
if (gimp_drawable_is_indexed (drawable))
return;
opacity = gimp_paint_options_get_fade (paint_options, image,
paint_core->pixel_dist);
if (opacity == 0.0)
return;
area = gimp_paint_core_get_paint_area (paint_core, drawable, paint_options);
if (! area)
return;
rate = options->rate;
rate *= gimp_paint_options_get_dynamic_rate (paint_options,
&paint_core->cur_coords);
gimp_convolve_calculate_matrix (convolve, options->type,
brush_core->brush->mask->width / 2,
brush_core->brush->mask->height / 2,
rate);
/* configure the source pixel region */
pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
area->x, area->y, area->width, area->height, FALSE);
if (gimp_drawable_has_alpha (drawable))
{
bytes = srcPR.bytes;
buffer = g_malloc (area->height * bytes * area->width);
pixel_region_init_data (&tempPR, buffer,
bytes, bytes * area->width,
0, 0, area->width, area->height);
copy_region (&srcPR, &tempPR);
}
else
{
/* note: this particular approach needlessly convolves the totally-
opaque alpha channel. A faster approach would be to keep
tempPR the same number of bytes as srcPR, and extend the
paint_core_replace_canvas API to handle non-alpha images. */
bytes = srcPR.bytes + 1;
buffer = g_malloc (area->height * bytes * area->width);
pixel_region_init_data (&tempPR, buffer,
bytes, bytes * area->width,
0, 0, area->width, area->height);
add_alpha_region (&srcPR, &tempPR);
}
/* Convolve the region */
pixel_region_init_data (&tempPR, buffer,
bytes, bytes * area->width,
0, 0, area->width, area->height);
pixel_region_init_temp_buf (&destPR, area,
0, 0, area->width, area->height);
convolve_region (&tempPR, &destPR,
convolve->matrix, 3, convolve->matrix_divisor,
GIMP_NORMAL_CONVOL, TRUE);
g_free (buffer);
gimp_brush_core_replace_canvas (brush_core, drawable,
MIN (opacity, GIMP_OPACITY_OPAQUE),
gimp_context_get_opacity (context),
gimp_paint_options_get_brush_mode (paint_options),
1.0,
GIMP_PAINT_INCREMENTAL);
}
static gboolean
gimp_smudge_start (GimpPaintCore *paint_core,
GimpDrawable *drawable,
GimpPaintOptions *paint_options)
{
GimpSmudge *smudge = GIMP_SMUDGE (paint_core);
GimpImage *image;
TempBuf *area;
PixelRegion srcPR;
gint bytes;
gint x, y, w, h;
image = gimp_item_get_image (GIMP_ITEM (drawable));
if (gimp_drawable_is_indexed (drawable))
return FALSE;
area = gimp_paint_core_get_paint_area (paint_core, drawable, paint_options);
if (! area)
return FALSE;
/* adjust the x and y coordinates to the upper left corner of the brush */
gimp_smudge_brush_coords (paint_core, &x, &y, &w, &h);
/* Allocate the accumulation buffer */
bytes = gimp_drawable_bytes (drawable);
smudge->accum_data = g_malloc (w * h * bytes);
/* If clipped, prefill the smudge buffer with the color at the
* brush position.
*/
if (x != area->x || y != area->y || w != area->width || h != area->height)
{
guchar fill[4];
gimp_pickable_get_pixel_at (GIMP_PICKABLE (drawable),
CLAMP ((gint) paint_core->cur_coords.x,
0,
gimp_item_width (GIMP_ITEM (drawable)) - 1),
CLAMP ((gint) paint_core->cur_coords.y,
0,
gimp_item_height (GIMP_ITEM (drawable)) - 1),
fill);
pixel_region_init_data (&srcPR, smudge->accum_data,
bytes, bytes * w,
0, 0, w, h);
color_region (&srcPR, fill);
}
pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
area->x, area->y, area->width, area->height, FALSE);
pixel_region_init_data (&smudge->accumPR, smudge->accum_data,
bytes, bytes * w,
area->x - x,
area->y - y,
area->width,
area->height);
/* copy the region under the original painthit. */
copy_region (&srcPR, &smudge->accumPR);
pixel_region_init_data (&smudge->accumPR, smudge->accum_data,
bytes, bytes * w,
area->x - x,
area->y - y,
area->width,
area->height);
return TRUE;
}
