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7224b40407
I integrated changes from SDL_image and updated as needed for JPEG memory loading functionality. Fixes https://github.com/libsdl-org/SDL/issues/12364
122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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#include "SDL_stb_c.h"
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// We currently only support JPEG, but we could add other image formats if we wanted
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#ifdef SDL_HAVE_STB
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#define malloc SDL_malloc
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#define realloc SDL_realloc
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#define free SDL_free
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#undef memcpy
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#define memcpy SDL_memcpy
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#undef memset
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#define memset SDL_memset
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#undef strcmp
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#define strcmp SDL_strcmp
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#undef strncmp
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#define strncmp SDL_strncmp
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#define strtol SDL_strtol
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#define abs SDL_abs
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#define pow SDL_pow
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#define ldexp SDL_scalbn
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#define STB_IMAGE_STATIC
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#define STBI_NO_THREAD_LOCALS
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#define STBI_FAILURE_USERMSG
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#if defined(SDL_NEON_INTRINSICS)
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#define STBI_NEON
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#endif
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#define STBI_ONLY_JPEG
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#define STBI_NO_GIF
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#define STBI_NO_PNG
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#define STBI_NO_HDR
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#define STBI_NO_LINEAR
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#define STBI_NO_ZLIB
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#define STBI_NO_STDIO
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#define STBI_ASSERT SDL_assert
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#define STB_IMAGE_IMPLEMENTATION
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#include "stb_image.h"
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#undef memset
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#endif
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#ifdef SDL_HAVE_STB
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static bool SDL_ConvertPixels_MJPG_to_NV12(int width, int height, const void *src, int src_pitch, void *dst, int dst_pitch)
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{
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int w = 0, h = 0, format = 0;
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stbi__context s;
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stbi__start_mem(&s, src, src_pitch);
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stbi__result_info ri;
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SDL_zero(ri);
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ri.bits_per_channel = 8;
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ri.channel_order = STBI_ORDER_RGB;
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ri.num_channels = 0;
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stbi__nv12 nv12;
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nv12.w = width;
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nv12.h = height;
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nv12.pitch = dst_pitch;
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nv12.y = (stbi_uc *)dst;
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nv12.uv = nv12.y + (nv12.h * nv12.pitch);
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void *pixels = stbi__jpeg_load(&s, &w, &h, &format, 4, &nv12, &ri);
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if (!pixels) {
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return false;
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}
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return true;
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}
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#endif // SDL_HAVE_STB
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bool SDL_ConvertPixels_STB(int width, int height,
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SDL_PixelFormat src_format, SDL_Colorspace src_colorspace, SDL_PropertiesID src_properties, const void *src, int src_pitch,
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SDL_PixelFormat dst_format, SDL_Colorspace dst_colorspace, SDL_PropertiesID dst_properties, void *dst, int dst_pitch)
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{
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#ifdef SDL_HAVE_STB
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if (src_format == SDL_PIXELFORMAT_MJPG && dst_format == SDL_PIXELFORMAT_NV12) {
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return SDL_ConvertPixels_MJPG_to_NV12(width, height, src, src_pitch, dst, dst_pitch);
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}
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bool result;
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int w = 0, h = 0, format = 0;
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int len = (src_format == SDL_PIXELFORMAT_MJPG) ? src_pitch : (height * src_pitch);
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void *pixels = stbi_load_from_memory(src, len, &w, &h, &format, 4);
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if (!pixels) {
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return false;
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}
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if (w == width && h == height) {
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result = SDL_ConvertPixelsAndColorspace(w, h, SDL_PIXELFORMAT_RGBA32, SDL_COLORSPACE_SRGB, 0, pixels, width * 4, dst_format, dst_colorspace, dst_properties, dst, dst_pitch);
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} else {
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result = SDL_SetError("Expected image size %dx%d, actual size %dx%d", width, height, w, h);
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}
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stbi_image_free(pixels);
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return result;
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#else
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return SDL_SetError("SDL not built with STB image support");
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#endif
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}
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