Exemple #1
0
static void merge_zoomed_image_scale_down(Image* dst, const Image* src, const Palette* pal,
  int x, int y, int opacity, int blend_mode, Zoom zoom)
{
  BlenderHelper<DstTraits, SrcTraits> blender(src, pal, blend_mode);
  int src_x, src_y, src_w, src_h;
  int dst_x, dst_y, dst_w, dst_h;
  int unbox_w, unbox_h;
  int bottom;

  unbox_w = zoom.remove(1);
  unbox_h = zoom.remove(1);

  src_x = 0;
  src_y = 0;
  src_w = src->width();
  src_h = src->height();

  dst_x = x;
  dst_y = y;
  dst_w = zoom.apply(src->width());
  dst_h = zoom.apply(src->height());

  // clipping...
  if (dst_x < 0) {
    src_x += zoom.remove(-dst_x);
    src_w -= zoom.remove(-dst_x);
    dst_w -= (-dst_x);
    dst_x = 0;
  }

  if (dst_y < 0) {
    src_y += zoom.remove(-dst_y);
    src_h -= zoom.remove(-dst_y);
    dst_h -= (-dst_y);
    dst_y = 0;
  }

  if (dst_x+dst_w > dst->width()) {
    src_w -= zoom.remove(dst_x+dst_w-dst->width());
    dst_w = dst->width() - dst_x;
  }

  if (dst_y+dst_h > dst->height()) {
    src_h -= zoom.remove(dst_y+dst_h-dst->height());
    dst_h = dst->height() - dst_y;
  }

  src_w = zoom.remove(zoom.apply(src_w));
  src_h = zoom.remove(zoom.apply(src_h));

  if ((src_w <= 0) || (src_h <= 0) ||
      (dst_w <= 0) || (dst_h <= 0))
    return;

  bottom = dst_y+dst_h-1;

  // Lock all necessary bits
  const LockImageBits<SrcTraits> srcBits(src, gfx::Rect(src_x, src_y, src_w, src_h));
  LockImageBits<DstTraits> dstBits(dst, gfx::Rect(dst_x, dst_y, dst_w, dst_h));
  typename LockImageBits<SrcTraits>::const_iterator src_it = srcBits.begin();
  typename LockImageBits<SrcTraits>::const_iterator src_end = srcBits.end();
  typename LockImageBits<DstTraits>::iterator dst_it, dst_end;

  // For each line to draw of the source image...
  for (y=0; y<src_h; y+=unbox_h) {
    dst_it = dstBits.begin_area(gfx::Rect(dst_x, dst_y, dst_w, 1));
    dst_end = dstBits.end_area(gfx::Rect(dst_x, dst_y, dst_w, 1));

    for (x=0; x<src_w; x+=unbox_w) {
      ASSERT(src_it >= srcBits.begin() && src_it < src_end);
      ASSERT(dst_it >= dstBits.begin() && dst_it < dst_end);

      blender(*dst_it, *dst_it, *src_it, opacity);

      // Skip source pixels
      for (int delta=0; delta < unbox_w && src_it != src_end; ++delta)
        ++src_it;

      ++dst_it;
    }

    if (++dst_y > bottom)
      break;

    // Skip lines
    for (int delta=0; delta < src_w * (unbox_h-1) && src_it != src_end; ++delta)
      ++src_it;
  }
}
Exemple #2
0
static void merge_zoomed_image_scale_up(Image* dst, const Image* src, const Palette* pal,
  int x, int y, int opacity, int blend_mode, Zoom zoom)
{
  BlenderHelper<DstTraits, SrcTraits> blender(src, pal, blend_mode);
  int src_x, src_y, src_w, src_h;
  int dst_x, dst_y, dst_w, dst_h;
  int box_x, box_y, box_w, box_h;
  int first_box_w, first_box_h;
  int line_h, bottom;

  box_w = zoom.apply(1);
  box_h = zoom.apply(1);

  src_x = 0;
  src_y = 0;
  src_w = src->width();
  src_h = src->height();

  dst_x = x;
  dst_y = y;
  dst_w = zoom.apply(src->width());
  dst_h = zoom.apply(src->height());

  // clipping...
  if (dst_x < 0) {
    src_x += zoom.remove(-dst_x);
    src_w -= zoom.remove(-dst_x);
    dst_w -= (-dst_x);
    first_box_w = box_w - ((-dst_x) % box_w);
    dst_x = 0;
  }
  else
    first_box_w = 0;

  if (dst_y < 0) {
    src_y += zoom.remove(-dst_y);
    src_h -= zoom.remove(-dst_y);
    dst_h -= (-dst_y);
    first_box_h = box_h - ((-dst_y) % box_h);
    dst_y = 0;
  }
  else
    first_box_h = 0;

  if (dst_x+dst_w > dst->width()) {
    src_w -= zoom.remove(dst_x+dst_w-dst->width());
    dst_w = dst->width() - dst_x;
  }

  if (dst_y+dst_h > dst->height()) {
    src_h -= zoom.remove(dst_y+dst_h-dst->height());
    dst_h = dst->height() - dst_y;
  }

  if ((src_w <= 0) || (src_h <= 0) ||
      (dst_w <= 0) || (dst_h <= 0))
    return;

  bottom = dst_y+dst_h-1;

  // the scanline variable is used to blend src/dst pixels one time for each pixel
  typedef std::vector<typename DstTraits::pixel_t> Scanline;
  Scanline scanline(src_w);
  typename Scanline::iterator scanline_it;
#ifdef _DEBUG
  typename Scanline::iterator scanline_end = scanline.end();
#endif

  // Lock all necessary bits
  const LockImageBits<SrcTraits> srcBits(src, gfx::Rect(src_x, src_y, src_w, src_h));
  LockImageBits<DstTraits> dstBits(dst, gfx::Rect(dst_x, dst_y, dst_w, dst_h));
  typename LockImageBits<SrcTraits>::const_iterator src_it = srcBits.begin();
#ifdef _DEBUG
  typename LockImageBits<SrcTraits>::const_iterator src_end = srcBits.end();
#endif
  typename LockImageBits<DstTraits>::iterator dst_it, dst_end;

  // For each line to draw of the source image...
  for (y=0; y<src_h; ++y) {
    dst_it = dstBits.begin_area(gfx::Rect(dst_x, dst_y, dst_w, 1));
    dst_end = dstBits.end_area(gfx::Rect(dst_x, dst_y, dst_w, 1));

    // Read 'src' and 'dst' and blend them, put the result in `scanline'
    scanline_it = scanline.begin();
    for (x=0; x<src_w; ++x) {
      ASSERT(src_it >= srcBits.begin() && src_it < src_end);
      ASSERT(dst_it >= dstBits.begin() && dst_it < dst_end);
      ASSERT(scanline_it >= scanline.begin() && scanline_it < scanline_end);

      blender(*scanline_it, *dst_it, *src_it, opacity);

      ++src_it;

      int delta;
      if ((x == 0) && (first_box_w > 0))
        delta = first_box_w;
      else
        delta = box_w;

      while (dst_it != dst_end && delta-- > 0)
        ++dst_it;

      ++scanline_it;
    }

    // Get the 'height' of the line to be painted in 'dst'
    if ((y == 0) && (first_box_h > 0))
      line_h = first_box_h;
    else
      line_h = box_h;

    // Draw the line in 'dst'
    for (box_y=0; box_y<line_h; ++box_y) {
      dst_it = dstBits.begin_area(gfx::Rect(dst_x, dst_y, dst_w, 1));
      dst_end = dstBits.end_area(gfx::Rect(dst_x, dst_y, dst_w, 1));
      scanline_it = scanline.begin();

      x = 0;

      // first pixel
      if (first_box_w > 0) {
        for (box_x=0; box_x<first_box_w; ++box_x) {
          ASSERT(scanline_it != scanline_end);
          ASSERT(dst_it != dst_end);

          *dst_it = *scanline_it;

          ++dst_it;
          if (dst_it == dst_end)
            goto done_with_line;
        }

        ++scanline_it;
        ++x;
      }

      // the rest of the line
      for (; x<src_w; ++x) {
        for (box_x=0; box_x<box_w; ++box_x) {
          ASSERT(dst_it !=  dst_end);

          *dst_it = *scanline_it;

          ++dst_it;
          if (dst_it == dst_end)
            goto done_with_line;
        }

        ++scanline_it;
      }

done_with_line:;
      if (++dst_y > bottom)
        goto done_with_blit;
    }

    // go to the next line in the source image
    ++src_y;
  }

done_with_blit:;
}