92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
#include <Imlib2.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "renderer.h"
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#include "types.h"
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#include "utils.h"
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/**
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* @brief 生成需要由 xcb 绘制的壁纸数据
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* @returns 壁纸数据，使用后记得释放
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*/
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uint32_t *generate_wallpaper(const wallpaper_config_t *wallpaper_config,
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const monitor_t *monitors, const uint32_t index,
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const uint32_t screen_width,
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const uint32_t screen_height) {
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if (!wallpaper_config || !monitors) return NULL;
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Imlib_Image final_image = imlib_create_image(screen_width, screen_height);
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if (!final_image) return NULL;
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imlib_context_set_image(final_image);
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imlib_image_set_has_alpha(false);
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/* 填充背景色 */
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imlib_context_set_color(0, 0, 0, 255);
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imlib_image_fill_rectangle(0, 0, screen_width, screen_height);
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const monitor_t *monitor = monitors;
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uint32_t monitor_index = 0;
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while (monitor) {
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uint32_t img_index = (index + monitor_index) % wallpaper_config->count;
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const char *path = wallpaper_config->path_list[img_index];
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Imlib_Image wallpaper_img = imlib_load_image(path);
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if (!wallpaper_img) {
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monitor = monitor->next;
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monitor_index++;
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continue;
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}
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uint32_t dst_width = monitor->monitor_width;
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uint32_t dst_height = monitor->monitor_height;
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/* 获取图片原始尺寸 */
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imlib_context_set_image(wallpaper_img);
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uint32_t img_width = imlib_image_get_width();
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uint32_t img_height = imlib_image_get_height();
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/* 计算缩放比例，保持原始宽高比 */
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float width_ratio = (float)dst_width / img_width;
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float height_ratio = (float)dst_height / img_height;
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float scale = MAX(width_ratio, height_ratio);
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/* 图片居中显示，计算原图绘制区域 */
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int src_width = dst_width / scale;
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int src_height = dst_height / scale;
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int src_x = (img_width - src_width) / 2;
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int src_y = (img_height - src_height) / 2;
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/* 绘制图片到最终图像上 */
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imlib_context_set_image(final_image);
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imlib_blend_image_onto_image(wallpaper_img, 1, src_x, src_y, src_width,
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src_height, monitor->monitor_x,
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monitor->monitor_y, dst_width, dst_height);
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/* 释放图片资源 */
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imlib_context_set_image(wallpaper_img);
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imlib_free_image();
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monitor = monitor->next;
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monitor_index++;
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}
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/* 获取最终图像数据 */
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imlib_context_set_image(final_image);
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uint32_t *data = imlib_image_get_data_for_reading_only();
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/* 复制数据到自己分配的内存中（原数据会在图像释放后无效） */
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size_t data_size = screen_width * screen_height * sizeof(uint32_t);
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uint32_t *result = ecalloc(1, data_size);
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if (result) memcpy(result, data, data_size);
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/* 释放图像 */
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imlib_context_set_image(final_image);
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imlib_free_image();
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return result;
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}
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