107 lines
4.0 KiB
C
107 lines
4.0 KiB
C
/*
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* This file is part of wl-overlay: show overlays with images and text in Wayland
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* Copyright © 2022 Midgard
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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 <http://www.gnu.org/licenses/>.
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*/
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#include <stdbool.h>
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#include <math.h>
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#include <cairo/cairo.h>
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#include <pango/pangocairo.h>
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#include "common.h"
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#include "state.h"
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#define float_is_zero(number) (number < 1e-8)
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static void
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set_source_argb_cairo(cairo_t *cairo, struct color_argb *color) {
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cairo_set_source_rgba(cairo, color->r, color->g, color->b, color->a);
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}
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static void
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draw_rounded_rectangle(cairo_t *cr, int x, int y, int width, int height, int radius)
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{
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cairo_new_sub_path(cr);
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cairo_arc(cr, x + radius, y + radius, radius, M_PI, 3*M_PI/2);
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cairo_arc(cr, x + width - radius, y + radius, radius, 3*M_PI/2, 0);
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cairo_arc(cr, x + width - radius, y + height - radius, radius, 0, M_PI/2);
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cairo_arc(cr, x + radius, y + height - radius, radius, M_PI/2, M_PI);
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cairo_close_path(cr);
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}
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void
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draw_frame_into(uint32_t *data, struct user_request *user_request, const int width, const int height)
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{
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cairo_surface_t *cairo_target_surface = cairo_image_surface_create_for_data(
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(unsigned char *)data, CAIRO_FORMAT_ARGB32, width, height, width * 4);
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cairo_t *cairo = cairo_create(cairo_target_surface);
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/* Draw background */
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if (!float_is_zero(user_request->backdrop.a)) {
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set_source_argb_cairo(cairo, &user_request->backdrop);
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draw_rounded_rectangle(cairo, 0, 0, width, height, user_request->border_radius);
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cairo_fill(cairo);
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}
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/* Load and draw PNG */
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if (strcmp("", user_request->graphics_filename) != STR_EQUAL) {
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cairo_save(cairo);
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cairo_surface_t *cairo_png_surface = cairo_image_surface_create_from_png(user_request->graphics_filename);
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if (cairo_surface_status(cairo_png_surface) != CAIRO_STATUS_SUCCESS) {
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fprintf(stderr, "Failed to open PNG image.\n");
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exit(1);
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}
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/* Set transformations to fit image in box */
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int img_width = cairo_image_surface_get_width(cairo_png_surface);
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int img_height = cairo_image_surface_get_height(cairo_png_surface);
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double width_scale = ((double)width - 2*user_request->padding) / img_width;
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double height_scale = (((double)height - 2*user_request->padding) * 3 / 4.0) / img_height;
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double scale = MIN(width_scale, height_scale);
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if (scale > 1.0) scale = 1.0;
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cairo_translate(cairo,
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(width - img_width *scale)/2.0,
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(3*height/4.0 - img_height*scale)/2.0);
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cairo_scale(cairo, scale, scale);
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cairo_set_source_surface(cairo, cairo_png_surface, 0.0, 0.0);
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cairo_paint(cairo);
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cairo_surface_destroy(cairo_png_surface);
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cairo_restore(cairo);
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}
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/* Draw text */
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if (user_request->text) {
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PangoLayout *layout = pango_cairo_create_layout(cairo);
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pango_layout_set_text(layout, user_request->text, -1);
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pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
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pango_layout_set_width(layout, (width - 2*user_request->padding) * PANGO_SCALE);
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PangoFontDescription *desc = pango_font_description_from_string(user_request->font);
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pango_layout_set_font_description(layout, desc);
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pango_font_description_free(desc);
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set_source_argb_cairo(cairo, &user_request->text_color);
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int text_width = 0, text_height = 0;
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pango_layout_get_size(layout, &text_width, &text_height);
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cairo_move_to(cairo, user_request->padding, 3*height/4.0);
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pango_cairo_show_layout(cairo, layout);
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g_object_unref(layout);
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}
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cairo_surface_destroy(cairo_target_surface);
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cairo_destroy(cairo);
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}
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