249 lines
7.9 KiB
C
249 lines
7.9 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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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 "libpikabase/pikabase.h"
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#include "libpikacolor/pikacolor.h"
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#include "libpikamath/pikamath.h"
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#include "libpikawidgets/pikawidgets.h"
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#include "display-types.h"
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#include "core/pika-cairo.h"
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#include "core/pika-utils.h"
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#include "core/pikaimage.h"
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#include "pikacanvas.h"
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#include "pikacanvas-style.h"
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#include "pikadisplay.h"
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#include "pikadisplayshell.h"
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#include "pikadisplayshell-draw.h"
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#include "pikadisplayshell-render.h"
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#include "widgets/pikarender.h"
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/* public functions */
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void
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pika_display_shell_draw_selection_out (PikaDisplayShell *shell,
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cairo_t *cr,
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PikaSegment *segs,
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gint n_segs)
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{
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g_return_if_fail (PIKA_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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pika_canvas_set_selection_out_style (shell->canvas, cr,
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shell->offset_x, shell->offset_y);
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pika_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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pika_display_shell_draw_selection_in (PikaDisplayShell *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 (PIKA_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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pika_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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pika_display_shell_draw_background (PikaDisplayShell *shell,
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cairo_t *cr)
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{
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PikaCanvas *canvas;
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g_return_if_fail (PIKA_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (cr != NULL);
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canvas = PIKA_CANVAS (shell->canvas);
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if (canvas->padding_mode != PIKA_CANVAS_PADDING_MODE_DEFAULT)
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{
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pika_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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pika_display_shell_draw_checkerboard (PikaDisplayShell *shell,
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cairo_t *cr)
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{
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PikaImage *image;
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g_return_if_fail (PIKA_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (cr != NULL);
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image = pika_display_get_image (shell->display);
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if (G_UNLIKELY (! shell->checkerboard))
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{
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PikaCheckSize check_size;
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g_object_get (shell->display->config,
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"transparency-size", &check_size,
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NULL);
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shell->checkerboard =
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pika_cairo_checkerboard_create (cr,
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1 << (check_size + 2),
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pika_render_check_color1 (),
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pika_render_check_color2 ());
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}
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cairo_translate (cr, - shell->offset_x, - shell->offset_y);
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if (pika_image_get_component_visible (image, PIKA_CHANNEL_ALPHA))
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cairo_set_source (cr, shell->checkerboard);
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else
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_paint (cr);
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}
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void
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pika_display_shell_draw_image (PikaDisplayShell *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 (PIKA_IS_DISPLAY_SHELL (shell));
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g_return_if_fail (pika_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 = shell->render_buf_width;
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chunk_height = shell->render_buf_height;
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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 *= shell->render_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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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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if (! pika_display_shell_render_is_valid (shell,
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x1, y1, x2 - x1, y2 - y1))
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{
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/* render image to the render cache */
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pika_display_shell_render (shell, cr,
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x1, y1, x2 - x1, y2 - y1,
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scale);
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pika_display_shell_render_validate_area (shell,
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x1, y1, x2 - x1, y2 - y1);
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}
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/* divide the cairo scale-factor by the window scale-factor, since
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* the render cache uses device pixels. see comment further up.
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*/
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cairo_scale (cr,
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1.0 / shell->render_scale,
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1.0 / shell->render_scale);
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/* render from the render cache to screen */
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cairo_set_source_surface (cr, shell->render_cache, 0, 0);
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cairo_paint (cr);
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cairo_restore (cr);
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/* if the PIKA_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 ("PIKA_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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