模拟器新增 RemoDispBus 推流服务端,修复远端取图
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@@ -69,3 +69,73 @@ void *sim_port_get_display(void)
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{
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return (void *)lv_display_get_default();
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}
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/*
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* 函数功能:读取当前屏幕内容并转换为 1bpp 单色位图(MSB-first)
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* 入口参数:buf - 输出缓冲(调用方分配,≥ 宽*高/8 字节)
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* buf_size - buf 容量(字节)
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* 返回值:0 - 成功,-1 - 失败
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* 限定条件:sim_port_init() 已成功;须在 SDL 所属线程(主循环线程)调用
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* 函数说明:1. lv_sdl_window_get_renderer 取 SDL 渲染器
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* 2. SDL_RenderReadPixels 读回屏幕实际呈现的 ARGB8888 像素
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* 3. 按红通道阈值 128 判白(=1/墨)/黑(=0),逐行打包为 1bpp MSB-first
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* 窗口模式为 I1+PARTIAL,LVGL 显示缓冲系分块且经 I1→ARGB8888
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* 转换,直接读 get_buf_active 不可靠;读回屏幕呈现像素最稳,
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* 且完全避开快照离屏重渲染(SDL 驱动下会卡派发循环)
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*/
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int sim_port_get_screen_mono(uint8_t *buf, uint32_t buf_size)
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{
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if (buf == NULL) {
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return -1;
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}
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lv_display_t *disp = lv_display_get_default();
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if (disp == NULL) {
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return -1;
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}
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int32_t w = lv_display_get_horizontal_resolution(disp);
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int32_t h = lv_display_get_vertical_resolution(disp);
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if (w <= 0 || h <= 0) {
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return -1;
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}
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uint32_t stride = (uint32_t)(w + 7) / 8u;
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uint32_t need = stride * (uint32_t)h;
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if (buf_size < need) {
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return -1;
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}
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SDL_Renderer *renderer = (SDL_Renderer *)lv_sdl_window_get_renderer(disp);
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if (renderer == NULL) {
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return -1;
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}
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/* 读回屏幕实际呈现的像素(ARGB8888,4 字节/像素) */
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uint32_t pitch = (uint32_t)w * 4u;
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uint8_t *px = (uint8_t *)SDL_malloc((size_t)w * (size_t)h * 4u);
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if (px == NULL) {
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return -1;
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}
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int rc = SDL_RenderReadPixels(renderer, NULL, SDL_PIXELFORMAT_ARGB8888, px, (int)pitch);
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if (rc != 0) {
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SDL_free(px);
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return -1;
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}
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/* 先清零(黑像素=0),ARGB8888 内存序 [B,G,R,A],红通道在偏移 2 */
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lv_memset(buf, 0, need);
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for (int32_t y = 0; y < h; y++) {
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const uint8_t *row = px + (size_t)y * (size_t)pitch;
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uint8_t *out = buf + (size_t)y * (size_t)stride;
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for (int32_t x = 0; x < w; x++) {
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if (row[(size_t)x * 4u + 2u] >= 128u) {
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out[(uint32_t)x >> 3] |= (uint8_t)(0x80u >> (x & 7));
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}
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}
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}
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SDL_free(px);
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return 0;
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}
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