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gimp/app/display/gimpdisplayshell-draw.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "display-types.h"
#include "base/tile-manager.h"
#include "core/gimpcontext.h"
#include "core/gimpgrid.h"
#include "core/gimpguide.h"
#include "core/gimpimage.h"
#include "core/gimpimage-grid.h"
#include "core/gimpimage-guides.h"
#include "core/gimpimage-sample-points.h"
#include "core/gimpprojection.h"
#include "core/gimpsamplepoint.h"
#include "vectors/gimpstroke.h"
#include "vectors/gimpvectors.h"
#include "widgets/gimpwidgets-utils.h"
#include "gimpcanvas.h"
#include "gimpdisplay.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-appearance.h"
#include "gimpdisplayshell-draw.h"
#include "gimpdisplayshell-render.h"
#include "gimpdisplayshell-scale.h"
#include "gimpdisplayshell-scroll.h"
#include "gimpdisplayshell-transform.h"
/* local function prototypes */
static GdkGC * gimp_display_shell_get_grid_gc (GimpDisplayShell *shell,
GimpGrid *grid);
static GdkGC * gimp_display_shell_get_pen_gc (GimpDisplayShell *shell,
GimpContext *context,
GimpActiveColor active);
/* public functions */
/**
* gimp_display_shell_get_scaled_image_size:
* @shell:
* @w:
* @h:
*
* Gets the size of the rendered image after it has been scaled.
*
**/
void
gimp_display_shell_draw_get_scaled_image_size (GimpDisplayShell *shell,
gint *w,
gint *h)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
gimp_display_shell_draw_get_scaled_image_size_for_scale (shell,
gimp_zoom_model_get_factor (shell->zoom),
w,
h);
}
/**
* gimp_display_shell_draw_get_scaled_image_size_for_scale:
* @shell:
* @scale:
* @w:
* @h:
*
**/
void
gimp_display_shell_draw_get_scaled_image_size_for_scale (GimpDisplayShell *shell,
gdouble scale,
gint *w,
gint *h)
{
GimpImage *image;
GimpProjection *proj;
TileManager *tiles;
gdouble scale_x;
gdouble scale_y;
gint level;
gint level_width;
gint level_height;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
image = gimp_display_get_image (shell->display);
g_return_if_fail (GIMP_IS_IMAGE (image));
proj = gimp_image_get_projection (image);
gimp_display_shell_calculate_scale_x_and_y (shell, scale, &scale_x, &scale_y);
level = gimp_projection_get_level (proj, scale_x, scale_y);
tiles = gimp_projection_get_tiles_at_level (proj, level, NULL);
level_width = tile_manager_width (tiles);
level_height = tile_manager_height (tiles);
if (w) *w = PROJ_ROUND (level_width * (scale_x * (1 << level)));
if (h) *h = PROJ_ROUND (level_height * (scale_y * (1 << level)));
}
void
gimp_display_shell_draw_guide (GimpDisplayShell *shell,
GimpGuide *guide,
gboolean active)
{
gint position;
gint x1, y1, x2, y2;
gint x, y;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
g_return_if_fail (GIMP_IS_GUIDE (guide));
position = gimp_guide_get_position (guide);
if (position < 0)
return;
x1 = 0;
y1 = 0;
gdk_drawable_get_size (gtk_widget_get_window (shell->canvas), &x2, &y2);
switch (gimp_guide_get_orientation (guide))
{
case GIMP_ORIENTATION_HORIZONTAL:
gimp_display_shell_transform_xy (shell, 0, position, &x, &y, FALSE);
y1 = y2 = y;
break;
case GIMP_ORIENTATION_VERTICAL:
gimp_display_shell_transform_xy (shell, position, 0, &x, &y, FALSE);
x1 = x2 = x;
break;
case GIMP_ORIENTATION_UNKNOWN:
return;
}
gimp_canvas_draw_line (GIMP_CANVAS (shell->canvas),
(active ?
GIMP_CANVAS_STYLE_GUIDE_ACTIVE :
GIMP_CANVAS_STYLE_GUIDE_NORMAL), x1, y1, x2, y2);
}
void
gimp_display_shell_draw_guides (GimpDisplayShell *shell)
{
GimpImage *image;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
image = gimp_display_get_image (shell->display);
if (image && gimp_display_shell_get_show_guides (shell))
{
GList *list;
for (list = gimp_image_get_guides (image);
list;
list = g_list_next (list))
{
gimp_display_shell_draw_guide (shell, list->data, FALSE);
}
}
}
void
gimp_display_shell_draw_grid (GimpDisplayShell *shell,
const GdkRectangle *area)
{
GimpImage *image;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
g_return_if_fail (area != NULL);
image = gimp_display_get_image (shell->display);
if (image && gimp_display_shell_get_show_grid (shell))
{
GimpGrid *grid;
GimpCanvas *canvas;
gdouble x, y;
gint x0, x1, x2, x3;
gint y0, y1, y2, y3;
gint x_real, y_real;
gdouble x_offset, y_offset;
gint width, height;
#define CROSSHAIR 2
grid = gimp_image_get_grid (image);
if (! grid)
return;
g_return_if_fail (grid->xspacing > 0 && grid->yspacing > 0);
x1 = area->x;
y1 = area->y;
x2 = area->x + area->width;
y2 = area->y + area->height;
width = gimp_image_get_width (image);
height = gimp_image_get_height (image);
x_offset = grid->xoffset;
while (x_offset > 0)
x_offset -= grid->xspacing;
y_offset = grid->yoffset;
while (y_offset > 0)
y_offset -= grid->yspacing;
canvas = GIMP_CANVAS (shell->canvas);
gimp_canvas_set_custom_gc (canvas,
gimp_display_shell_get_grid_gc (shell, grid));
switch (grid->style)
{
case GIMP_GRID_DOTS:
for (x = x_offset; x <= width; x += grid->xspacing)
{
if (x < 0)
continue;
gimp_display_shell_transform_xy (shell,
x, 0, &x_real, &y_real,
FALSE);
if (x_real < x1 || x_real >= x2)
continue;
for (y = y_offset; y <= height; y += grid->yspacing)
{
if (y < 0)
continue;
gimp_display_shell_transform_xy (shell,
x, y, &x_real, &y_real,
FALSE);
if (y_real >= y1 && y_real < y2)
gimp_canvas_draw_point (GIMP_CANVAS (shell->canvas),
GIMP_CANVAS_STYLE_CUSTOM,
x_real, y_real);
}
}
break;
case GIMP_GRID_INTERSECTIONS:
for (x = x_offset; x <= width; x += grid->xspacing)
{
if (x < 0)
continue;
gimp_display_shell_transform_xy (shell,
x, 0, &x_real, &y_real,
FALSE);
if (x_real + CROSSHAIR < x1 || x_real - CROSSHAIR >= x2)
continue;
for (y = y_offset; y <= height; y += grid->yspacing)
{
if (y < 0)
continue;
gimp_display_shell_transform_xy (shell,
x, y, &x_real, &y_real,
FALSE);
if (y_real + CROSSHAIR < y1 || y_real - CROSSHAIR >= y2)
continue;
if (x_real >= x1 && x_real < x2)
gimp_canvas_draw_line (canvas, GIMP_CANVAS_STYLE_CUSTOM,
x_real,
CLAMP (y_real - CROSSHAIR,
y1, y2 - 1),
x_real,
CLAMP (y_real + CROSSHAIR,
y1, y2 - 1));
if (y_real >= y1 && y_real < y2)
gimp_canvas_draw_line (canvas, GIMP_CANVAS_STYLE_CUSTOM,
CLAMP (x_real - CROSSHAIR,
x1, x2 - 1),
y_real,
CLAMP (x_real + CROSSHAIR,
x1, x2 - 1),
y_real);
}
}
break;
case GIMP_GRID_ON_OFF_DASH:
case GIMP_GRID_DOUBLE_DASH:
case GIMP_GRID_SOLID:
gimp_display_shell_transform_xy (shell,
0, 0, &x0, &y0,
FALSE);
gimp_display_shell_transform_xy (shell,
width, height, &x3, &y3,
FALSE);
for (x = x_offset; x < width; x += grid->xspacing)
{
if (x < 0)
continue;
gimp_display_shell_transform_xy (shell,
x, 0, &x_real, &y_real,
FALSE);
if (x_real >= x1 && x_real < x2)
gimp_canvas_draw_line (canvas, GIMP_CANVAS_STYLE_CUSTOM,
x_real, y0, x_real, y3 - 1);
}
for (y = y_offset; y < height; y += grid->yspacing)
{
if (y < 0)
continue;
gimp_display_shell_transform_xy (shell,
0, y, &x_real, &y_real,
FALSE);
if (y_real >= y1 && y_real < y2)
gimp_canvas_draw_line (canvas, GIMP_CANVAS_STYLE_CUSTOM,
x0, y_real, x3 - 1, y_real);
}
break;
}
gimp_canvas_set_custom_gc (canvas, NULL);
}
}
void
gimp_display_shell_draw_pen (GimpDisplayShell *shell,
const GimpVector2 *points,
gint num_points,
GimpContext *context,
GimpActiveColor color,
gint width)
{
GimpCanvas *canvas;
GdkGC *gc;
GdkGCValues values;
GdkPoint *coords;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
g_return_if_fail (GIMP_IS_CONTEXT (context));
g_return_if_fail (num_points == 0 || points != NULL);
canvas = GIMP_CANVAS (shell->canvas);
coords = g_new (GdkPoint, MAX (2, num_points));
gimp_display_shell_transform_points (shell,
points, coords, num_points, FALSE);
if (num_points == 1)
{
coords[1] = coords[0];
num_points = 2;
}
gc = gimp_display_shell_get_pen_gc (shell, context, color);
values.line_width = MAX (1, width);
gdk_gc_set_values (gc, &values, GDK_GC_LINE_WIDTH);
gimp_canvas_set_custom_gc (canvas, gc);
gimp_canvas_draw_lines (canvas, GIMP_CANVAS_STYLE_CUSTOM, coords, num_points);
gimp_canvas_set_custom_gc (canvas, NULL);
g_free (coords);
}
void
gimp_display_shell_draw_sample_point (GimpDisplayShell *shell,
GimpSamplePoint *sample_point,
gboolean active)
{
GimpImage *image;
GimpCanvasStyle style;
gdouble x, y;
gint x1, x2;
gint y1, y2;
gint w, h;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
g_return_if_fail (sample_point != NULL);
if (sample_point->x < 0)
return;
image = gimp_display_get_image (shell->display);
gimp_display_shell_transform_xy_f (shell,
sample_point->x + 0.5,
sample_point->y + 0.5,
&x, &y, FALSE);
x1 = floor (x - GIMP_SAMPLE_POINT_DRAW_SIZE);
x2 = ceil (x + GIMP_SAMPLE_POINT_DRAW_SIZE);
y1 = floor (y - GIMP_SAMPLE_POINT_DRAW_SIZE);
y2 = ceil (y + GIMP_SAMPLE_POINT_DRAW_SIZE);
gdk_drawable_get_size (gtk_widget_get_window (shell->canvas), &w, &h);
if (x < - GIMP_SAMPLE_POINT_DRAW_SIZE ||
y < - GIMP_SAMPLE_POINT_DRAW_SIZE ||
x > w + GIMP_SAMPLE_POINT_DRAW_SIZE ||
y > h + GIMP_SAMPLE_POINT_DRAW_SIZE)
return;
if (active)
style = GIMP_CANVAS_STYLE_SAMPLE_POINT_ACTIVE;
else
style = GIMP_CANVAS_STYLE_SAMPLE_POINT_NORMAL;
#define HALF_SIZE (GIMP_SAMPLE_POINT_DRAW_SIZE / 2)
gimp_canvas_draw_line (GIMP_CANVAS (shell->canvas), style,
x, y1, x, y1 + HALF_SIZE);
gimp_canvas_draw_line (GIMP_CANVAS (shell->canvas), style,
x, y2 - HALF_SIZE, x, y2);
gimp_canvas_draw_line (GIMP_CANVAS (shell->canvas), style,
x1, y, x1 + HALF_SIZE, y);
gimp_canvas_draw_line (GIMP_CANVAS (shell->canvas), style,
x2 - HALF_SIZE, y, x2, y);
gimp_canvas_draw_arc (GIMP_CANVAS (shell->canvas), style,
FALSE,
x - HALF_SIZE, y - HALF_SIZE,
GIMP_SAMPLE_POINT_DRAW_SIZE,
GIMP_SAMPLE_POINT_DRAW_SIZE,
0, 64 * 270);
gimp_canvas_draw_text (GIMP_CANVAS (shell->canvas), style,
x + 2, y + 2,
"%d",
g_list_index (gimp_image_get_sample_points (image),
sample_point) + 1);
}
void
gimp_display_shell_draw_sample_points (GimpDisplayShell *shell)
{
GimpImage *image;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
image = gimp_display_get_image (shell->display);
if (image && gimp_display_shell_get_show_sample_points (shell))
{
GList *list;
for (list = gimp_image_get_sample_points (image);
list;
list = g_list_next (list))
{
gimp_display_shell_draw_sample_point (shell, list->data, FALSE);
}
}
}
void
gimp_display_shell_draw_vector (GimpDisplayShell *shell,
GimpVectors *vectors)
{
GimpStroke *stroke = NULL;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
g_return_if_fail (GIMP_IS_VECTORS (vectors));
while ((stroke = gimp_vectors_stroke_get_next (vectors, stroke)))
{
GArray *coords;
gboolean closed;
coords = gimp_stroke_interpolate (stroke, 1.0, &closed);
if (coords && coords->len > 0)
{
GdkPoint *gdk_coords = g_new (GdkPoint, coords->len);
gimp_display_shell_transform_coords (shell,
&g_array_index (coords,
GimpCoords, 0),
gdk_coords,
coords->len,
FALSE);
gimp_canvas_draw_lines (GIMP_CANVAS (shell->canvas),
GIMP_CANVAS_STYLE_XOR,
gdk_coords, coords->len);
g_free (gdk_coords);
}
if (coords)
g_array_free (coords, TRUE);
}
}
void
gimp_display_shell_draw_vectors (GimpDisplayShell *shell)
{
GimpImage *image;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
image = gimp_display_get_image (shell->display);
if (image && TRUE /* gimp_display_shell_get_show_vectors (shell) */)
{
GList *all_vectors;
GList *list;
all_vectors = gimp_image_get_vectors_list (image);
for (list = all_vectors; list; list = list->next)
{
GimpVectors *vectors = list->data;
if (gimp_item_get_visible (GIMP_ITEM (vectors)))
gimp_display_shell_draw_vector (shell, vectors);
}
g_list_free (all_vectors);
}
}
void
gimp_display_shell_draw_cursor (GimpDisplayShell *shell)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (shell->have_cursor)
gimp_canvas_draw_cursor (GIMP_CANVAS (shell->canvas),
shell->cursor_x, shell->cursor_y);
}
void
gimp_display_shell_draw_area (GimpDisplayShell *shell,
gint x,
gint y,
gint w,
gint h)
{
gint sx, sy;
gint sw, sh;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (! gimp_display_get_image (shell->display))
return;
sx = - shell->offset_x;
sy = - shell->offset_y;
gimp_display_shell_draw_get_scaled_image_size (shell, &sw, &sh);
/* check if the passed in area intersects with
* both the display and the image
*/
if (gimp_rectangle_intersect (x, y, w, h,
0, 0, shell->disp_width, shell->disp_height,
&x, &y, &w, &h)
&&
gimp_rectangle_intersect (x, y, w, h,
sx, sy, sw, sh,
&x, &y, &w, &h))
{
GdkRectangle rect;
gint x2, y2;
gint i, j;
x2 = x + w;
y2 = y + h;
if (shell->highlight)
{
rect.x = ceil (shell->scale_x * shell->highlight->x);
rect.y = ceil (shell->scale_y * shell->highlight->y);
rect.width = floor (shell->scale_x * shell->highlight->width);
rect.height = floor (shell->scale_y * shell->highlight->height);
}
/* display the image in RENDER_BUF_WIDTH x RENDER_BUF_HEIGHT
* sized chunks
*/
for (i = y; i < y2; i += GIMP_DISPLAY_RENDER_BUF_HEIGHT)
{
for (j = x; j < x2; j += GIMP_DISPLAY_RENDER_BUF_WIDTH)
{
gint disp_xoffset, disp_yoffset;
gint dx, dy;
dx = MIN (x2 - j, GIMP_DISPLAY_RENDER_BUF_WIDTH);
dy = MIN (y2 - i, GIMP_DISPLAY_RENDER_BUF_HEIGHT);
gimp_display_shell_scroll_get_disp_offset (shell,
&disp_xoffset,
&disp_yoffset);
gimp_display_shell_render (shell,
j - disp_xoffset,
i - disp_yoffset,
dx, dy,
shell->highlight ? &rect : NULL);
}
}
}
}
/* private functions */
static GdkGC *
gimp_display_shell_get_grid_gc (GimpDisplayShell *shell,
GimpGrid *grid)
{
GdkGCValues values;
GdkColor fg, bg;
if (shell->grid_gc)
return shell->grid_gc;
switch (grid->style)
{
case GIMP_GRID_ON_OFF_DASH:
values.line_style = GDK_LINE_ON_OFF_DASH;
break;
case GIMP_GRID_DOUBLE_DASH:
values.line_style = GDK_LINE_DOUBLE_DASH;
break;
case GIMP_GRID_DOTS:
case GIMP_GRID_INTERSECTIONS:
case GIMP_GRID_SOLID:
values.line_style = GDK_LINE_SOLID;
break;
}
values.join_style = GDK_JOIN_MITER;
shell->grid_gc = gdk_gc_new_with_values (gtk_widget_get_window (shell->canvas),
&values, (GDK_GC_LINE_STYLE |
GDK_GC_JOIN_STYLE));
gimp_rgb_get_gdk_color (&grid->fgcolor, &fg);
gdk_gc_set_rgb_fg_color (shell->grid_gc, &fg);
gimp_rgb_get_gdk_color (&grid->bgcolor, &bg);
gdk_gc_set_rgb_bg_color (shell->grid_gc, &bg);
return shell->grid_gc;
}
static GdkGC *
gimp_display_shell_get_pen_gc (GimpDisplayShell *shell,
GimpContext *context,
GimpActiveColor active)
{
GdkGCValues values;
GimpRGB rgb;
GdkColor color;
if (shell->pen_gc)
return shell->pen_gc;
values.line_style = GDK_LINE_SOLID;
values.cap_style = GDK_CAP_ROUND;
values.join_style = GDK_JOIN_ROUND;
shell->pen_gc = gdk_gc_new_with_values (gtk_widget_get_window (shell->canvas),
&values, (GDK_GC_LINE_STYLE |
GDK_GC_CAP_STYLE |
GDK_GC_JOIN_STYLE));
switch (active)
{
case GIMP_ACTIVE_COLOR_FOREGROUND:
gimp_context_get_foreground (context, &rgb);
break;
case GIMP_ACTIVE_COLOR_BACKGROUND:
gimp_context_get_background (context, &rgb);
break;
}
gimp_rgb_get_gdk_color (&rgb, &color);
gdk_gc_set_rgb_fg_color (shell->pen_gc, &color);
g_object_add_weak_pointer (G_OBJECT (shell->pen_gc),
(gpointer) &shell->pen_gc);
g_signal_connect_object (context, "notify",
G_CALLBACK (g_object_unref),
shell->pen_gc, G_CONNECT_SWAPPED);
return shell->pen_gc;
}
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