/**
Draws the @a frame of animation of the specified @a sprite
in a new image and return it.
Positions source_x, source_y, width and height must have the
zoom applied (zoom.apply(sorce_x), zoom.apply(source_y), zoom.apply(width), etc.)
*/
Image* RenderEngine::renderSprite(int source_x, int source_y,
int width, int height,
FrameNumber frame, Zoom zoom,
bool draw_tiled_bg,
bool enable_onionskin,
ImageBufferPtr& buffer)
{
void (*zoomed_func)(Image*, const Image*, const Palette*, int, int, int, int, Zoom);
const LayerImage* background = m_sprite->backgroundLayer();
bool need_checked_bg = (background != NULL ? !background->isVisible(): true);
uint32_t bg_color = 0;
Image *image;
switch (m_sprite->pixelFormat()) {
case IMAGE_RGB:
zoomed_func = merge_zoomed_image<RgbTraits, RgbTraits>;
break;
case IMAGE_GRAYSCALE:
zoomed_func = merge_zoomed_image<RgbTraits, GrayscaleTraits>;
break;
case IMAGE_INDEXED:
zoomed_func = merge_zoomed_image<RgbTraits, IndexedTraits>;
if (!need_checked_bg)
bg_color = m_sprite->getPalette(frame)->getEntry(m_sprite->transparentColor());
break;
default:
return NULL;
}
// Create a temporary RGB bitmap to draw all to it
image = Image::create(IMAGE_RGB, width, height, buffer);
if (!image)
return NULL;
// Draw checked background
if (need_checked_bg && draw_tiled_bg)
renderCheckedBackground(image, source_x, source_y, zoom);
else
clear_image(image, bg_color);
// Draw the current frame.
global_opacity = 255;
renderLayer(m_sprite->folder(), image,
source_x, source_y, frame, zoom, zoomed_func, true, true, -1);
// Onion-skin feature: Draw previous/next frames with different
// opacity (<255) (it is the onion-skinning)
IDocumentSettings* docSettings = UIContext::instance()
->settings()->getDocumentSettings(m_document);
if (enable_onionskin & docSettings->getUseOnionskin()) {
int prevs = docSettings->getOnionskinPrevFrames();
int nexts = docSettings->getOnionskinNextFrames();
int opacity_base = docSettings->getOnionskinOpacityBase();
int opacity_step = docSettings->getOnionskinOpacityStep();
for (FrameNumber f=frame.previous(prevs); f <= frame.next(nexts); ++f) {
if (f == frame || f < 0 || f > m_sprite->lastFrame())
continue;
else if (f < frame)
global_opacity = opacity_base - opacity_step * ((frame - f)-1);
else
global_opacity = opacity_base - opacity_step * ((f - frame)-1);
if (global_opacity > 0) {
global_opacity = MID(0, global_opacity, 255);
int blend_mode = -1;
if (docSettings->getOnionskinType() == IDocumentSettings::Onionskin_Merge)
blend_mode = BLEND_MODE_NORMAL;
else if (docSettings->getOnionskinType() == IDocumentSettings::Onionskin_RedBlueTint)
blend_mode = (f < frame ? BLEND_MODE_RED_TINT: BLEND_MODE_BLUE_TINT);
renderLayer(m_sprite->folder(), image,
source_x, source_y, f, zoom, zoomed_func,
true, true, blend_mode);
}
}
}
return image;
}
