578 lines
17 KiB
C
578 lines
17 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 <stdlib.h>
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#include <math.h>
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libpikamath/pikamath.h"
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#include "display-types.h"
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#include "config/pikadisplayconfig.h"
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#include "core/pikaimage.h"
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#include "pikacanvas.h"
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#include "pikadisplay.h"
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#include "pikadisplay-foreach.h"
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#include "pikadisplayshell.h"
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#include "pikadisplayshell-expose.h"
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#include "pikadisplayshell-render.h"
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#include "pikadisplayshell-rotate.h"
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#include "pikadisplayshell-rulers.h"
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#include "pikadisplayshell-scale.h"
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#include "pikadisplayshell-scroll.h"
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#include "pikadisplayshell-scrollbars.h"
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#include "pikadisplayshell-transform.h"
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#define OVERPAN_FACTOR 0.5
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/**
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* pika_display_shell_scroll:
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* @shell:
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* @x_offset:
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* @y_offset:
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*
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* This function scrolls the image in the shell's viewport. It does
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* actual scrolling of the pixels, so only the newly scrolled-in parts
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* are freshly redrawn.
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*
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* Use it for incremental actual panning.
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**/
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void
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pika_display_shell_scroll (PikaDisplayShell *shell,
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gint x_offset,
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gint y_offset)
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{
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gint old_x;
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gint old_y;
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g_return_if_fail (PIKA_IS_DISPLAY_SHELL (shell));
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if (x_offset == 0 && y_offset == 0)
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return;
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old_x = shell->offset_x;
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old_y = shell->offset_y;
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/* freeze the active tool */
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pika_display_shell_pause (shell);
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shell->offset_x += x_offset;
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shell->offset_y += y_offset;
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pika_display_shell_scroll_clamp_and_update (shell);
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/* the actual changes in offset */
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x_offset = (shell->offset_x - old_x);
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y_offset = (shell->offset_y - old_y);
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if (x_offset || y_offset)
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{
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pika_display_shell_scrolled (shell);
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pika_overlay_box_scroll (PIKA_OVERLAY_BOX (shell->canvas),
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-x_offset, -y_offset);
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if (shell->render_cache)
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{
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cairo_surface_t *surface;
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cairo_t *cr;
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surface = cairo_surface_create_similar_image (
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shell->render_cache,
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CAIRO_FORMAT_ARGB32,
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shell->disp_width * shell->render_scale,
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shell->disp_height * shell->render_scale);
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cr = cairo_create (surface);
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cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
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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_destroy (cr);
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cr = cairo_create (shell->render_cache);
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cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
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cairo_set_source_surface (cr, surface,
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-x_offset * shell->render_scale,
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-y_offset * shell->render_scale);
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cairo_paint (cr);
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cairo_destroy (cr);
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cairo_surface_destroy (surface);
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}
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if (shell->render_cache_valid)
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{
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cairo_rectangle_int_t rect;
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cairo_region_translate (shell->render_cache_valid,
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-x_offset, -y_offset);
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rect.x = 0;
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rect.y = 0;
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rect.width = shell->disp_width;
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rect.height = shell->disp_height;
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cairo_region_intersect_rectangle (shell->render_cache_valid, &rect);
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}
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}
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/* re-enable the active tool */
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pika_display_shell_resume (shell);
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}
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/**
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* pika_display_shell_scroll_set_offsets:
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* @shell:
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* @offset_x:
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* @offset_y:
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*
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* This function scrolls the image in the shell's viewport. It redraws
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* the entire canvas.
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*
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* Use it for setting the scroll offset on freshly scaled images or
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* when the window is resized. For panning, use
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* pika_display_shell_scroll().
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**/
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void
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pika_display_shell_scroll_set_offset (PikaDisplayShell *shell,
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gint offset_x,
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gint offset_y)
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{
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g_return_if_fail (PIKA_IS_DISPLAY_SHELL (shell));
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if (shell->offset_x == offset_x &&
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shell->offset_y == offset_y)
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return;
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pika_display_shell_scale_save_revert_values (shell);
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/* freeze the active tool */
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pika_display_shell_pause (shell);
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shell->offset_x = offset_x;
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shell->offset_y = offset_y;
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pika_display_shell_scroll_clamp_and_update (shell);
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pika_display_shell_scrolled (shell);
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pika_display_shell_expose_full (shell);
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pika_display_shell_render_invalidate_full (shell);
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/* re-enable the active tool */
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pika_display_shell_resume (shell);
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}
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/**
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* pika_display_shell_scroll_clamp_and_update:
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* @shell:
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*
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* Helper function for calling two functions that are commonly called
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* in pairs.
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**/
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void
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pika_display_shell_scroll_clamp_and_update (PikaDisplayShell *shell)
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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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image = pika_display_get_image (shell->display);
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if (image)
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{
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if (! shell->show_all)
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{
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gint bounds_x;
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gint bounds_y;
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gint bounds_width;
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gint bounds_height;
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gint min_offset_x;
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gint max_offset_x;
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gint min_offset_y;
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gint max_offset_y;
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gint offset_x;
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gint offset_y;
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pika_display_shell_rotate_update_transform (shell);
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pika_display_shell_scale_get_image_bounds (shell,
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&bounds_x,
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&bounds_y,
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&bounds_width,
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&bounds_height);
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if (shell->disp_width < bounds_width)
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{
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min_offset_x = bounds_x -
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shell->disp_width * OVERPAN_FACTOR;
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max_offset_x = bounds_x + bounds_width -
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shell->disp_width * (1.0 - OVERPAN_FACTOR);
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}
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else
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{
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gint overpan_amount;
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overpan_amount = shell->disp_width -
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bounds_width * (1.0 - OVERPAN_FACTOR);
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min_offset_x = bounds_x -
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overpan_amount;
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max_offset_x = bounds_x + bounds_width - shell->disp_width +
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overpan_amount;
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}
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if (shell->disp_height < bounds_height)
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{
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min_offset_y = bounds_y -
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shell->disp_height * OVERPAN_FACTOR;
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max_offset_y = bounds_y + bounds_height -
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shell->disp_height * (1.0 - OVERPAN_FACTOR);
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}
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else
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{
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gint overpan_amount;
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overpan_amount = shell->disp_height -
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bounds_height * (1.0 - OVERPAN_FACTOR);
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min_offset_y = bounds_y -
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overpan_amount;
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max_offset_y = bounds_y + bounds_height +
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overpan_amount - shell->disp_height;
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}
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/* Clamp */
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offset_x = CLAMP (shell->offset_x, min_offset_x, max_offset_x);
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offset_y = CLAMP (shell->offset_y, min_offset_y, max_offset_y);
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if (offset_x != shell->offset_x || offset_y != shell->offset_y)
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{
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shell->offset_x = offset_x;
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shell->offset_y = offset_y;
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pika_display_shell_rotate_update_transform (shell);
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}
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/* Set scrollbar stepper sensitiity */
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pika_display_shell_scrollbars_update_steppers (shell,
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min_offset_x,
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max_offset_x,
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min_offset_y,
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max_offset_y);
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}
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else
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{
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/* Set scrollbar stepper sensitiity */
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pika_display_shell_scrollbars_update_steppers (shell,
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G_MININT,
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G_MAXINT,
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G_MININT,
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G_MAXINT);
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}
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}
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else
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{
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shell->offset_x = 0;
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shell->offset_y = 0;
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}
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pika_display_shell_scrollbars_update (shell);
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pika_display_shell_rulers_update (shell);
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}
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/**
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* pika_display_shell_scroll_unoverscrollify:
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* @shell:
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* @in_offset_x:
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* @in_offset_y:
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* @out_offset_x:
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* @out_offset_y:
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*
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* Takes a scroll offset and returns the offset that will not result
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* in a scroll beyond the image border. If the image is already
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* overscrolled, the return value is 0 for that given axis.
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**/
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void
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pika_display_shell_scroll_unoverscrollify (PikaDisplayShell *shell,
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gint in_offset_x,
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gint in_offset_y,
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gint *out_offset_x,
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gint *out_offset_y)
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{
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gint sw, sh;
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gint out_offset_x_dummy, out_offset_y_dummy;
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g_return_if_fail (PIKA_IS_DISPLAY_SHELL (shell));
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if (! out_offset_x) out_offset_x = &out_offset_x_dummy;
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if (! out_offset_y) out_offset_y = &out_offset_y_dummy;
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*out_offset_x = in_offset_x;
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*out_offset_y = in_offset_y;
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if (! shell->show_all)
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{
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pika_display_shell_scale_get_image_size (shell, &sw, &sh);
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if (in_offset_x < 0)
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{
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*out_offset_x = MAX (in_offset_x,
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MIN (0, 0 - shell->offset_x));
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}
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else if (in_offset_x > 0)
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{
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gint min_offset = sw - shell->disp_width;
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*out_offset_x = MIN (in_offset_x,
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MAX (0, min_offset - shell->offset_x));
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}
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if (in_offset_y < 0)
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{
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*out_offset_y = MAX (in_offset_y,
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MIN (0, 0 - shell->offset_y));
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}
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else if (in_offset_y > 0)
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{
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gint min_offset = sh - shell->disp_height;
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*out_offset_y = MIN (in_offset_y,
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MAX (0, min_offset - shell->offset_y));
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}
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}
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}
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/**
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* pika_display_shell_scroll_center_image_xy:
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* @shell:
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* @image_x:
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* @image_y:
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*
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* Center the viewport around the passed image coordinate
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**/
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void
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pika_display_shell_scroll_center_image_xy (PikaDisplayShell *shell,
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gdouble image_x,
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gdouble image_y)
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{
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gint viewport_x;
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gint viewport_y;
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pika_display_shell_transform_xy (shell,
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image_x, image_y,
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&viewport_x, &viewport_y);
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pika_display_shell_scroll (shell,
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viewport_x - shell->disp_width / 2,
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viewport_y - shell->disp_height / 2);
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}
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/**
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* pika_display_shell_scroll_center_image:
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* @shell:
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* @horizontally:
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* @vertically:
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*
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* Centers the image in the display shell on the desired axes.
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**/
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void
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pika_display_shell_scroll_center_image (PikaDisplayShell *shell,
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gboolean horizontally,
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gboolean vertically)
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{
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gint image_x;
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gint image_y;
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gint image_width;
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gint image_height;
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gint center_x;
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gint center_y;
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gint offset_x = 0;
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gint offset_y = 0;
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g_return_if_fail (PIKA_IS_DISPLAY_SHELL (shell));
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if (! shell->display ||
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! pika_display_get_image (shell->display) ||
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(! vertically && ! horizontally))
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return;
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pika_display_shell_scale_get_image_bounds (shell,
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&image_x, &image_y,
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&image_width, &image_height);
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if (shell->disp_width > image_width)
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{
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image_x -= (shell->disp_width - image_width) / 2;
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image_width = shell->disp_width;
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}
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if (shell->disp_height > image_height)
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{
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image_y -= (shell->disp_height - image_height) / 2;
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image_height = shell->disp_height;
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}
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center_x = image_x + image_width / 2;
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center_y = image_y + image_height / 2;
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if (horizontally)
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offset_x = center_x - shell->disp_width / 2 - shell->offset_x;
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if (vertically)
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offset_y = center_y - shell->disp_height / 2 - shell->offset_y;
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pika_display_shell_scroll (shell, offset_x, offset_y);
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}
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/**
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* pika_display_shell_scroll_center_image:
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* @shell:
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* @horizontally:
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* @vertically:
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*
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* Centers the image content in the display shell on the desired axes.
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**/
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void
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pika_display_shell_scroll_center_content (PikaDisplayShell *shell,
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gboolean horizontally,
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gboolean vertically)
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{
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gint content_x;
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gint content_y;
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gint content_width;
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gint content_height;
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gint center_x;
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gint center_y;
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gint offset_x = 0;
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gint offset_y = 0;
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g_return_if_fail (PIKA_IS_DISPLAY_SHELL (shell));
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if (! shell->display ||
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! pika_display_get_image (shell->display) ||
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(! vertically && ! horizontally))
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return;
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if (! pika_display_shell_get_infinite_canvas (shell))
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{
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pika_display_shell_scale_get_image_bounds (shell,
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&content_x,
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&content_y,
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&content_width,
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&content_height);
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}
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else
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{
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pika_display_shell_scale_get_image_bounding_box (shell,
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&content_x,
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&content_y,
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&content_width,
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&content_height);
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}
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if (shell->disp_width > content_width)
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{
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content_x -= (shell->disp_width - content_width) / 2;
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content_width = shell->disp_width;
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}
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if (shell->disp_height > content_height)
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{
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content_y -= (shell->disp_height - content_height) / 2;
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content_height = shell->disp_height;
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}
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center_x = content_x + content_width / 2;
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center_y = content_y + content_height / 2;
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if (horizontally)
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offset_x = center_x - shell->disp_width / 2 - shell->offset_x;
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if (vertically)
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offset_y = center_y - shell->disp_height / 2 - shell->offset_y;
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pika_display_shell_scroll (shell, offset_x, offset_y);
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}
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/**
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* pika_display_shell_scroll_get_scaled_viewport:
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* @shell:
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* @x:
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* @y:
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* @w:
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* @h:
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*
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* Gets the viewport in screen coordinates, with origin at (0, 0) in
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* the image.
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**/
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void
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pika_display_shell_scroll_get_scaled_viewport (PikaDisplayShell *shell,
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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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g_return_if_fail (PIKA_IS_DISPLAY_SHELL (shell));
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*x = shell->offset_x;
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*y = shell->offset_y;
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*w = shell->disp_width;
|
|
*h = shell->disp_height;
|
|
}
|
|
|
|
/**
|
|
* pika_display_shell_scroll_get_viewport:
|
|
* @shell:
|
|
* @x:
|
|
* @y:
|
|
* @w:
|
|
* @h:
|
|
*
|
|
* Gets the viewport in image coordinates.
|
|
**/
|
|
void
|
|
pika_display_shell_scroll_get_viewport (PikaDisplayShell *shell,
|
|
gdouble *x,
|
|
gdouble *y,
|
|
gdouble *w,
|
|
gdouble *h)
|
|
{
|
|
g_return_if_fail (PIKA_IS_DISPLAY_SHELL (shell));
|
|
|
|
*x = shell->offset_x / shell->scale_x;
|
|
*y = shell->offset_y / shell->scale_y;
|
|
*w = shell->disp_width / shell->scale_x;
|
|
*h = shell->disp_height / shell->scale_y;
|
|
}
|
