mirror of
https://github.com/ctruLua/ctruLua.git
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97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
#include "sfil.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <jpeglib.h>
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static sf2d_texture *_sfil_load_JPEG_generic(struct jpeg_decompress_struct *jinfo, struct jpeg_error_mgr *jerr, sf2d_place place)
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{
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int row_bytes;
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switch (jinfo->out_color_space) {
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case JCS_RGB:
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row_bytes = jinfo->image_width * 3;
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break;
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default:
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goto exit_error;
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}
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sf2d_texture *texture = sf2d_create_texture(jinfo->image_width,
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jinfo->image_height,
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GPU_RGBA8, place);
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JSAMPARRAY buffer = (JSAMPARRAY)malloc(sizeof(JSAMPROW));
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buffer[0] = (JSAMPROW)malloc(sizeof(JSAMPLE) * row_bytes);
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unsigned int i, color, *tex_ptr;
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unsigned char *jpeg_ptr;
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void *row_ptr = texture->data;
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jpeg_start_decompress(jinfo);
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int stride = texture->pow2_w * 4;
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while (jinfo->output_scanline < jinfo->output_height) {
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jpeg_read_scanlines(jinfo, buffer, 1);
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tex_ptr = (row_ptr += stride);
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for (i = 0, jpeg_ptr = buffer[0]; i < jinfo->output_width; i++) {
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color = *(jpeg_ptr++);
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color |= *(jpeg_ptr++)<<8;
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color |= *(jpeg_ptr++)<<16;
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*(tex_ptr++) = color | 0xFF000000;
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}
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}
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free(buffer[0]);
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free(buffer);
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sf2d_texture_tile32(texture);
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return texture;
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exit_error:
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return NULL;
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}
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sf2d_texture *sfil_load_JPEG_file(const char *filename, sf2d_place place)
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{
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FILE *fp;
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if ((fp = fopen(filename, "rb")) < 0) {
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return NULL;
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}
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struct jpeg_decompress_struct jinfo;
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struct jpeg_error_mgr jerr;
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jinfo.err = jpeg_std_error(&jerr);
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jpeg_create_decompress(&jinfo);
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jpeg_stdio_src(&jinfo, fp);
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jpeg_read_header(&jinfo, 1);
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sf2d_texture *texture = _sfil_load_JPEG_generic(&jinfo, &jerr, place);
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jpeg_finish_decompress(&jinfo);
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jpeg_destroy_decompress(&jinfo);
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fclose(fp);
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return texture;
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}
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sf2d_texture *sfil_load_JPEG_buffer(const void *buffer, unsigned long buffer_size, sf2d_place place)
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{
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struct jpeg_decompress_struct jinfo;
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struct jpeg_error_mgr jerr;
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jinfo.err = jpeg_std_error(&jerr);
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jpeg_create_decompress(&jinfo);
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jpeg_mem_src(&jinfo, (void *)buffer, buffer_size);
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jpeg_read_header(&jinfo, 1);
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sf2d_texture *texture = _sfil_load_JPEG_generic(&jinfo, &jerr, place);
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jpeg_finish_decompress(&jinfo);
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jpeg_destroy_decompress(&jinfo);
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return texture;
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}
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