mirror of https://github.com/GNOME/gimp.git
254 lines
7.9 KiB
C
254 lines
7.9 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libgimpbase/gimpbase.h"
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#include "libgimpcolor/gimpcolor.h"
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#include "libgimpmath/gimpmath.h"
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#include "libgimpwidgets/gimpwidgets.h"
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#include "display-types.h"
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#include "core/gimp-cairo.h"
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#include "core/gimp-utils.h"
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#include "gimpcanvas.h"
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#include "gimpcanvas-style.h"
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#include "gimpcanvaspath.h"
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#include "gimpdisplay.h"
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#include "gimpdisplayshell.h"
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#include "gimpdisplayshell-draw.h"
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#include "gimpdisplayshell-render.h"
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#include "gimpdisplayshell-scale.h"
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#include "gimpdisplayshell-transform.h"
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#include "gimpdisplayxfer.h"
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#define GIMP_DISPLAY_RENDER_ENABLE_SCALING 1
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/* public functions */
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void
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gimp_display_shell_draw_selection_out (GimpDisplayShell *shell,
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cairo_t *cr,
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GimpSegment *segs,
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gint n_segs)
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{
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (cr != NULL);
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g_return_if_fail (segs != NULL && n_segs > 0);
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gimp_canvas_set_selection_out_style (shell->canvas, cr,
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shell->offset_x, shell->offset_y);
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gimp_cairo_segments (cr, segs, n_segs);
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cairo_stroke (cr);
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}
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void
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gimp_display_shell_draw_selection_in (GimpDisplayShell *shell,
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cairo_t *cr,
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cairo_pattern_t *mask,
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gint index)
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{
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (cr != NULL);
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g_return_if_fail (mask != NULL);
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gimp_canvas_set_selection_in_style (shell->canvas, cr, index,
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shell->offset_x, shell->offset_y);
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cairo_mask (cr, mask);
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}
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void
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gimp_display_shell_draw_background (GimpDisplayShell *shell,
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cairo_t *cr)
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{
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GimpCanvas *canvas;
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (cr != NULL);
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canvas = GIMP_CANVAS (shell->canvas);
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if (canvas->padding_mode != GIMP_CANVAS_PADDING_MODE_DEFAULT)
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{
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gimp_cairo_set_source_rgb (cr, &canvas->padding_color);
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cairo_paint (cr);
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}
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}
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void
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gimp_display_shell_draw_checkerboard (GimpDisplayShell *shell,
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cairo_t *cr)
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{
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (cr != NULL);
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if (G_UNLIKELY (! shell->checkerboard))
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{
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GimpCheckSize check_size;
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GimpCheckType check_type;
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guchar check_light;
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guchar check_dark;
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GimpRGB light;
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GimpRGB dark;
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g_object_get (shell->display->config,
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"transparency-size", &check_size,
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"transparency-type", &check_type,
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NULL);
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gimp_checks_get_shades (check_type, &check_light, &check_dark);
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gimp_rgb_set_uchar (&light, check_light, check_light, check_light);
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gimp_rgb_set_uchar (&dark, check_dark, check_dark, check_dark);
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shell->checkerboard =
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gimp_cairo_checkerboard_create (cr,
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1 << (check_size + 2), &light, &dark);
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}
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cairo_translate (cr, - shell->offset_x, - shell->offset_y);
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cairo_set_source (cr, shell->checkerboard);
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cairo_paint (cr);
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}
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void
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gimp_display_shell_draw_image (GimpDisplayShell *shell,
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cairo_t *cr,
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gint x,
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gint y,
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gint w,
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gint h)
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{
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gdouble chunk_width;
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gdouble chunk_height;
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gdouble scale = 1.0;
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gint n_rows;
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gint n_cols;
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gint r, c;
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g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (gimp_display_get_image (shell->display));
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g_return_if_fail (cr != NULL);
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/* display the image in RENDER_BUF_WIDTH x RENDER_BUF_HEIGHT
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* maximally-sized image-space chunks. adjust the screen-space
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* chunk size as necessary, to accommodate for the display
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* transform and window scale factor.
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*/
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chunk_width = GIMP_DISPLAY_RENDER_BUF_WIDTH;
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chunk_height = GIMP_DISPLAY_RENDER_BUF_HEIGHT;
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#ifdef GIMP_DISPLAY_RENDER_ENABLE_SCALING
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/* multiply the image scale-factor by the window scale-factor, and divide
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* the cairo scale-factor by the same amount (further down), so that we make
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* full use of the screen resolution, even on hidpi displays.
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*/
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scale *=
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gdk_window_get_scale_factor (
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gtk_widget_get_window (gtk_widget_get_toplevel (GTK_WIDGET (shell))));
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#endif
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scale = MIN (scale, GIMP_DISPLAY_RENDER_MAX_SCALE);
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scale *= MAX (shell->scale_x, shell->scale_y);
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if (scale != shell->scale_x)
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chunk_width = (chunk_width - 1.0) * (shell->scale_x / scale);
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if (scale != shell->scale_y)
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chunk_height = (chunk_height - 1.0) * (shell->scale_y / scale);
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if (shell->rotate_untransform)
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{
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gdouble a = shell->rotate_angle * G_PI / 180.0;
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chunk_width = chunk_height = (MIN (chunk_width, chunk_height) - 1.0) /
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(fabs (sin (a)) + fabs (cos (a)));
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}
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/* divide the painted area to evenly-sized chunks */
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n_rows = ceil (h / floor (chunk_height));
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n_cols = ceil (w / floor (chunk_width));
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for (r = 0; r < n_rows; r++)
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{
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gint y1 = y + (2 * r * h + n_rows) / (2 * n_rows);
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gint y2 = y + (2 * (r + 1) * h + n_rows) / (2 * n_rows);
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for (c = 0; c < n_cols; c++)
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{
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gint x1 = x + (2 * c * w + n_cols) / (2 * n_cols);
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gint x2 = x + (2 * (c + 1) * w + n_cols) / (2 * n_cols);
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gdouble ix1, iy1;
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gdouble ix2, iy2;
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gint ix, iy;
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gint iw, ih;
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/* map chunk from screen space to scaled image space */
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gimp_display_shell_untransform_bounds_with_scale (
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shell, scale,
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x1, y1, x2, y2,
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&ix1, &iy1, &ix2, &iy2);
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ix = floor (ix1);
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iy = floor (iy1);
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iw = ceil (ix2) - ix;
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ih = ceil (iy2) - iy;
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cairo_save (cr);
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/* clip to chunk bounds, in screen space */
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cairo_rectangle (cr, x1, y1, x2 - x1, y2 - y1);
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cairo_clip (cr);
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/* transform to scaled image space, and apply uneven scaling */
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if (shell->rotate_transform)
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cairo_transform (cr, shell->rotate_transform);
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cairo_translate (cr, -shell->offset_x, -shell->offset_y);
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cairo_scale (cr, shell->scale_x / scale, shell->scale_y / scale);
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/* render image */
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gimp_display_shell_render (shell, cr, ix, iy, iw, ih, scale);
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cairo_restore (cr);
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/* if the GIMP_BRICK_WALL environment variable is defined,
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* show chunk bounds
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*/
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{
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static gint brick_wall = -1;
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if (brick_wall < 0)
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brick_wall = (g_getenv ("GIMP_BRICK_WALL") != NULL);
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if (brick_wall)
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{
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_rectangle (cr, x1, y1, x2 - x1, y2 - y1);
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cairo_stroke (cr);
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}
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}
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}
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}
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}
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