mirror of
https://gitea.sffempire.ru/Kolyah35/minecraft-pe-0.6.1.git
synced 2026-03-20 15:03:32 +00:00
99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
#include "PngLoader.h"
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#include <png.h>
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#include <cstring>
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struct MemoryReader {
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const unsigned char* data;
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size_t size;
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size_t pos;
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};
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static void pngMemoryRead(png_structp pngPtr, png_bytep outBytes, png_size_t byteCountToRead) {
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#ifndef STANDALONE_SERVER
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MemoryReader* reader = (MemoryReader*)png_get_io_ptr(pngPtr);
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if (!reader)
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return;
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if (reader->pos + byteCountToRead > reader->size) {
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png_error(pngPtr, "Read past end of buffer");
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return;
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}
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memcpy(outBytes, reader->data + reader->pos, byteCountToRead);
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reader->pos += byteCountToRead;
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#endif
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}
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TextureData loadPngFromMemory(const unsigned char* data, size_t size) {
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TextureData out;
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#ifndef STANDALONE_SERVER
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if (!data || size == 0) return out;
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png_structp pngPtr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (!pngPtr) return out;
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png_infop infoPtr = png_create_info_struct(pngPtr);
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if (!infoPtr) {
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png_destroy_read_struct(&pngPtr, NULL, NULL);
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return out;
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}
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if (setjmp(png_jmpbuf(pngPtr))) {
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png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
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return out;
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}
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MemoryReader reader;
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reader.data = data;
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reader.size = size;
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reader.pos = 0;
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png_set_read_fn(pngPtr, &reader, pngMemoryRead);
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png_read_info(pngPtr, infoPtr);
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// Convert any color type to 8-bit RGBA
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if (png_get_color_type(pngPtr, infoPtr) == PNG_COLOR_TYPE_PALETTE)
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png_set_palette_to_rgb(pngPtr);
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if (png_get_color_type(pngPtr, infoPtr) == PNG_COLOR_TYPE_GRAY && png_get_bit_depth(pngPtr, infoPtr) < 8)
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png_set_expand_gray_1_2_4_to_8(pngPtr);
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if (png_get_valid(pngPtr, infoPtr, PNG_INFO_tRNS))
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png_set_tRNS_to_alpha(pngPtr);
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if (png_get_bit_depth(pngPtr, infoPtr) == 16)
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png_set_strip_16(pngPtr);
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// Ensure we always have RGBA (4 bytes per pixel)
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// Only add alpha if the image lacks it (e.g., RGB skin files).
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png_set_gray_to_rgb(pngPtr);
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// Handle interlaced PNGs properly
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int number_passes = png_set_interlace_handling(pngPtr);
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png_read_update_info(pngPtr, infoPtr);
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int colorType = png_get_color_type(pngPtr, infoPtr);
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if (colorType == PNG_COLOR_TYPE_RGB) {
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png_set_filler(pngPtr, 0xFF, PNG_FILLER_AFTER);
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}
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out.w = png_get_image_width(pngPtr, infoPtr);
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out.h = png_get_image_height(pngPtr, infoPtr);
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png_bytep* rowPtrs = new png_bytep[out.h];
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out.data = new unsigned char[4 * out.w * out.h];
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out.memoryHandledExternally = false;
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int rowStrideBytes = 4 * out.w;
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for (int i = 0; i < out.h; i++) {
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rowPtrs[i] = (png_bytep)&out.data[i*rowStrideBytes];
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}
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png_read_image(pngPtr, rowPtrs);
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png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
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delete[] rowPtrs;
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#endif
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return out;
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}
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