2708 static int create_png_image_raw(png *a, uint8 *raw, uint32 raw_len, int out_n, uint32 x, uint32 y)  in create_png_image_raw()  argument
2711    uint32 i,j,stride = x*out_n;  in create_png_image_raw()
2714    assert(out_n == s->img_n || out_n == s->img_n+1);  in create_png_image_raw()
2716    a->out = MALLOC(x * y * out_n);  in create_png_image_raw()
2744       if (img_n != out_n) cur[img_n] = 255;  in create_png_image_raw()
2746       cur += out_n;  in create_png_image_raw()
2747       prior += out_n;  in create_png_image_raw()
2749       if (img_n == out_n) {  in create_png_image_raw()
2772          assert(img_n+1 == out_n);  in create_png_image_raw()
2775                 for (i=x-1; i >= 1; --i, cur[img_n]=255,raw+=img_n,cur+=out_n,prior+=out_n) \  in create_png_image_raw()
2780             CASE(F_sub)   cur[k] = raw[k] + cur[k-out_n];  in create_png_image_raw()
2784             CASE(F_avg)   cur[k] = raw[k] + ((prior[k] + cur[k-out_n])>>1);  in create_png_image_raw()
2786             CASE(F_paeth)  cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],prior[k],prior[k-out_n]));  in create_png_image_raw()
2788             CASE(F_avg_first)    cur[k] = raw[k] + (cur[k-out_n] >> 1);  in create_png_image_raw()
2790             CASE(F_paeth_first)  cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],0,0));  in create_png_image_raw()
2799 static int create_png_image(png *a, uint8 *raw, uint32 raw_len, int out_n, int interlaced)  in create_png_image()  argument
2805       return create_png_image_raw(a, raw, raw_len, out_n, a->s.img_x, a->s.img_y);  in create_png_image()
2810    final = MALLOC(a->s.img_x * a->s.img_y * out_n);  in create_png_image()
2821          if (!create_png_image_raw(a, raw, raw_len, out_n, x, y)) {  in create_png_image()
2827                memcpy(final + (j*yspc[p]+yorig[p])*a->s.img_x*out_n + (i*xspc[p]+xorig[p])*out_n,  in create_png_image()
2828                       a->out + (j*x+i)*out_n, out_n);  in create_png_image()
2830          raw += (x*out_n+1)*y;  in create_png_image()
2831          raw_len -= (x*out_n+1)*y;  in create_png_image()
2840 static int compute_transparency(png *z, uint8 tc[3], int out_n)  in compute_transparency()  argument
2848    assert(out_n == 2 || out_n == 4);  in compute_transparency()
2850    if (out_n == 2) {  in compute_transparency()