Drawing texture ontop of another

[ambranera]

Hi, im trying to draw (image2->texture ) on top of (image1->texture) but it seems that i can not do it properly, the code i'm using is

Code PHP:

void draw_rectangle(int x,int y,UL_IMAGE* dest,UL_IMAGE* src)
{
    int i=0;
    int j=0;
    int    srcWidth= src->sizeX;
    int     srcHeight= src->sizeY;
    int    destWidth= dest->sizeX;
    void*   destTexture=dest->texture;
    void*   srcTexture=src->texture;

    destTexture+=(y * destWidth + x)*2;//jumping y*destWidth pixel(y lines) then jumps x pixels ( the *2 is because i'm handling 2bytes truecolor images)

    for(j=0;j<srcHeight;j++)//for each row
    {
        for(i=0;i<srcWidth;i++)//for each pixel of row
        {
            *((uint16*)destTexture)=*((uint16*)srcTexture); //Copies the value
            destTexture+=2;//jumps two bytes foward
            srcTexture+=2; //jumps two bytes foward
            
        }
        destTexture+=(destWidth-srcWidth)*2;//Jumps a row foward
    }
} 


this code doesnt work, any hints?

[Nesgba]

*void = 4 bytes generally, transtype is evil

Code PHP:

void draw_rectangle(int x,int y,UL_IMAGE* dest,UL_IMAGE* src)
{
    int i=0;
    int j=0;
    int    srcWidth= src->sizeX;
    int    srcHeight= src->sizeY;
    int    destWidth= dest->sizeX;
    uint16*   destTexture=(uint16*)dest->texture;
    uint16*   srcTexture=(uint16*)src->texture;

    destTexture+=(y * destWidth + x);//jumping y*destWidth pixel(y lines) then jumps x pixels ( the *2 is because i'm handling 2bytes truecolor images)

    for(j=0;j<srcHeight;j++)//for each row
    {
        for(i=0;i<srcWidth;i++)//for each pixel of row
        {
            *destTexture=*srcTexture; //Copies the value
            destTexture++;//jumps two bytes foward
            srcTexture++; //jumps two bytes foward
            
        }
        destTexture+=(destWidth-srcWidth);//Jumps a row foward
    }
} 


[ambranera]

void * is 4 byte
so incrementing void** would add 4 to void**

void is 1byte on ds
so incrementing void* adds 1 to void*

anyway i solved, the surfaces dont have the width of the image but the nearest power of 2, this code works

Code PHP:

void draw_rectangle(int x,int y,UL_IMAGE* dest,UL_IMAGE* src,u8 size)
{
    int i=0;
    int j=0;
    int    srcWidth= src->sysSizeX;
    int     srcHeight= src->sysSizeY;
    int    srcRealWidth= src->sizeX;
    int     srcRealHeight= src->sizeY;
    int    destWidth= dest->sysSizeX;
//    int    destHeight= dest->sizeY;
    void*   destTexture=dest->texture;
    void*   srcTexture=src->texture;

    destTexture+=(y * destWidth + x)<<1;//Saltiamo tante linee quanto � il valore di y incrementando il puntatore al buffer

    for(j=0;j<srcRealHeight;j++)//Ripetiamo il ciclo per ogni colonna
    {
        
        for(i=0;i<srcRealWidth;i++)
        {
            *((uint16*)destTexture)=*((uint16*)srcTexture); //Copies First byte
            
            destTexture+=2;
            srcTexture+=2;
            
        }
        srcTexture+=(srcWidth-srcRealWidth)<<1;
        destTexture+=((destWidth-srcRealWidth)<<1);
    }
}