3D 第一个控件成功显示

web_server/app/Pixel_Frame.cpp

@@ -1,6 +1,7 @@
 #include "Pixel_Frame.h"
 
 #include <algorithm>
+#include <cstring>
 #include <limits>
 #if defined(_M_X64) || defined(__x86_64__)
 #include <tmmintrin.h>
@@ -110,4 +111,35 @@ std::string encode_pixel_frame(Image_View image, Color background) {
     return frame;
 }
 
+std::string encode_rgba8_pixel_frame(const std::byte* pixels,
+                                     std::uint32_t width,
+                                     std::uint32_t height,
+                                     std::size_t stride) {
+    constexpr std::size_t bytes_per_pixel = 4;
+    if (pixels == nullptr || width == 0 || height == 0)
+        return {};
+    if (width > std::numeric_limits<std::size_t>::max() / bytes_per_pixel)
+        return {};
+    const std::size_t row_bytes = static_cast<std::size_t>(width) * bytes_per_pixel;
+    if (stride < row_bytes ||
+        height > (std::numeric_limits<std::size_t>::max() - pixel_frame_header_size) /
+                     row_bytes)
+        return {};
+
+    std::string frame(pixel_frame_header_size + row_bytes * height, '\0');
+    frame[0] = 'R';
+    frame[1] = 'V';
+    frame[2] = 'P';
+    frame[3] = '1';
+    write_u32_le(frame.data() + 4, width);
+    write_u32_le(frame.data() + 8, height);
+    write_u32_le(frame.data() + 12, static_cast<std::uint32_t>(row_bytes));
+    char* output = frame.data() + pixel_frame_header_size;
+    for (std::uint32_t row = 0; row < height; ++row) {
+        std::memcpy(output + static_cast<std::size_t>(row) * row_bytes,
+                    pixels + static_cast<std::size_t>(row) * stride, row_bytes);
+    }
+    return frame;
+}
+
 } // namespace renderive::web