ulibrary/source/libLoadJpg.c

#include "ulib.h"
#include "jpeg/gba-jpeg.h"
#include "jpeg/gba-jpeg-decode.h"

UL_IMAGE *ulLoadImageJPG(VIRTUAL_FILE *f, UL_IMAGE_LOCATION location,
                         UL_IMAGE_FORMATS pixelFormat)
{
    UL_IMAGE *img = NULL;
    const unsigned char *input, *input_free;

    // Format 16 bits obligatoire pour le JPG!
    if (ul_pixelWidth[pixelFormat] != 16)
        return NULL;

    input = (const unsigned char*)ulReadEntireFileToMemory(f, NULL);
    input_free = input;

    if (input)
    {
        int width, height;
        JPEG_Decoder decoder;

        JPEG_Decoder_ReadHeaders(&decoder, &input);
        width = decoder.frame.width;
        height = decoder.frame.height;

        // Crée l'image dans laquelle on mettra notre bitmap
        img = ulCreateImage(width, height, UL_IN_RAM, pixelFormat, 0);

        if (img)
        {
            if (!JPEG_Decoder_ReadImage (&decoder, &input, img->texture, img->sysSizeX, img->sysSizeY))
            {
                ulDeleteImage(img);
                img = NULL;
            }
        }

        free((void*)input_free);

        if (location == UL_IN_VRAM)
        {
            if (!ulRealizeImage(img))
            {
                ulDeleteImage(img);
                return NULL;
            }
        }
    }
    return img;
}