getColorFromBuf

typedef struct
{
    int width;
    int height;
    int linewidth;
    int pixelformat;
    u32 *buffer;
} CANVAS;


int getColorFromBuf(int x, int y)
{
    CANVAS canvas;
    u32 *vram32;
    u16 *vram16;

    sceDisplayGetFrameBuf((void *)&canvas.buffer, &canvas.linewidth, &canvas.pixelformat, 1);

    switch(canvas.pixelformat)
    {
        case PSP_DISPLAY_PIXEL_FORMAT_565:
        case PSP_DISPLAY_PIXEL_FORMAT_5551:
        case PSP_DISPLAY_PIXEL_FORMAT_4444:

            vram16 = (u16 *)canvas.buffer + x + y * canvas.linewidth;
            return (int)vram16[0];

        case PSP_DISPLAY_PIXEL_FORMAT_8888:

            vram32 = canvas.buffer + x + y * canvas.linewidth;
            return (int)vram32[0];
    }
    return -1;
}