old data

2025-08-25 09:50:30 +08:00
parent bd0e31e922
commit 1359ff4ecc
1630 changed files with 738486 additions and 2399 deletions
@@ -0,0 +1,121 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include "SDL_stb_c.h"
+
+
+// We currently only support JPEG, but we could add other image formats if we wanted
+#ifdef SDL_HAVE_STB
+#define malloc SDL_malloc
+#define realloc SDL_realloc
+#define free SDL_free
+#undef memcpy
+#define memcpy SDL_memcpy
+#undef memset
+#define memset SDL_memset
+#undef strcmp
+#define strcmp SDL_strcmp
+#undef strncmp
+#define strncmp SDL_strncmp
+#define strtol SDL_strtol
+
+#define abs SDL_abs
+#define pow SDL_pow
+#define ldexp SDL_scalbn
+
+#define STB_IMAGE_STATIC
+#define STBI_NO_THREAD_LOCALS
+#define STBI_FAILURE_USERMSG
+#if defined(SDL_NEON_INTRINSICS)
+#define STBI_NEON
+#endif
+#define STBI_ONLY_JPEG
+#define STBI_NO_GIF
+#define STBI_NO_PNG
+#define STBI_NO_HDR
+#define STBI_NO_LINEAR
+#define STBI_NO_ZLIB
+#define STBI_NO_STDIO
+#define STBI_ASSERT SDL_assert
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+
+#undef memset
+#endif
+
+#ifdef SDL_HAVE_STB
+static bool SDL_ConvertPixels_MJPG_to_NV12(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
+{
+    int w = 0, h = 0, format = 0;
+    stbi__context s;
+    stbi__start_mem(&s, src, src_pitch);
+
+    stbi__result_info ri;
+    SDL_zero(ri);
+    ri.bits_per_channel = 8;
+    ri.channel_order = STBI_ORDER_RGB;
+    ri.num_channels = 0;
+
+    stbi__nv12 nv12;
+    nv12.w = width;
+    nv12.h = height;
+    nv12.pitch = dst_pitch;
+    nv12.y = (stbi_uc *)dst;
+    nv12.uv = nv12.y + (nv12.h * nv12.pitch);
+
+    void *pixels = stbi__jpeg_load(&s, &w, &h, &format, 4, &nv12, &ri);
+    if (!pixels) {
+        return false;
+    }
+    return true;
+}
+#endif // SDL_HAVE_STB
+
+bool SDL_ConvertPixels_STB(int width, int height,
+                           SDL_PixelFormat src_format, SDL_Colorspace src_colorspace, SDL_PropertiesID src_properties, const void *src, int src_pitch,
+                           SDL_PixelFormat dst_format, SDL_Colorspace dst_colorspace, SDL_PropertiesID dst_properties, void *dst, int dst_pitch)
+{
+#ifdef SDL_HAVE_STB
+    if (src_format == SDL_PIXELFORMAT_MJPG && dst_format == SDL_PIXELFORMAT_NV12) {
+        return SDL_ConvertPixels_MJPG_to_NV12(width, height, src, src_pitch, dst, dst_pitch);
+    }
+
+    bool result;
+    int w = 0, h = 0, format = 0;
+    int len = (src_format == SDL_PIXELFORMAT_MJPG) ? src_pitch : (height * src_pitch);
+    void *pixels = stbi_load_from_memory(src, len, &w, &h, &format, 4);
+    if (!pixels) {
+        return false;
+    }
+
+    if (w == width && h == height) {
+        result = SDL_ConvertPixelsAndColorspace(w, h, SDL_PIXELFORMAT_RGBA32, SDL_COLORSPACE_SRGB, 0, pixels, width * 4, dst_format, dst_colorspace, dst_properties, dst, dst_pitch);
+    } else {
+        result = SDL_SetError("Expected image size %dx%d, actual size %dx%d", width, height, w, h);
+    }
+    stbi_image_free(pixels);
+
+    return result;
+#else
+    return SDL_SetError("SDL not built with STB image support");
+#endif
+}