/**
* \brief Sets the opacity of this surface.
* \param opacity The opacity (0 to 255).
*/
void Surface::set_opacity(uint8_t opacity) {
this->opacity = opacity;
if (software_destination // The destination surface is in RAM.
|| !Video::is_acceleration_enabled() // The rendering is in RAM.
) {
if (internal_surface == nullptr) {
create_software_surface();
}
int error = SDL_SetSurfaceAlphaMod(internal_surface.get(), opacity);
if (error != 0) {
Debug::error(SDL_GetError());
}
is_rendered = false; // The surface has changed.
}
// If this is a hardware surface, the opacity is applied later.
}
/**
* \brief Sets the opacity of this surface.
* \param opacity the opacity (0 to 255).
*/
void Surface::set_opacity(uint8_t opacity) {
if (software_destination // The destination surface is in RAM.
|| !Video::is_acceleration_enabled() // The rendering is in RAM.
) {
if (internal_surface == NULL) {
create_software_surface();
}
// The surface must be 32-bit with alpha value for this function to work.
convert_software_surface();
int error = SDL_SetSurfaceAlphaMod(internal_surface, opacity);
if (error != 0) {
Debug::error(SDL_GetError());
}
is_rendered = false; // The surface has changed.
}
else {
internal_opacity = opacity;
}
}
/**
* \brief Draws a subrectangle of this surface on another surface.
* \param region The subrectangle to draw in this object.
* \param dst_surface The destination surface.
* \param dst_position Coordinates on the destination surface.
*/
void Surface::raw_draw_region(
const Rectangle& region,
Surface& dst_surface,
const Point& dst_position) {
if (dst_surface.software_destination // The destination surface is in RAM.
|| !Video::is_acceleration_enabled() // The rendering is in RAM.
) {
if (dst_surface.internal_surface == nullptr) {
dst_surface.create_software_surface();
}
// First, draw subsurfaces if any.
// They can exist if the video mode recently switched from an accelerated
// one to a software one.
if (!subsurfaces.empty()) {
if (this->internal_surface == nullptr) {
create_software_surface();
}
std::vector<SubSurfaceNodePtr> subsurfaces = this->subsurfaces;
this->subsurfaces.clear(); // Avoid infinite recursive calls if there are cycles.
for (SubSurfaceNodePtr& subsurface: subsurfaces) {
// TODO draw the subsurfaces of the whole tree recursively instead.
// The current version is not correct because it handles only one level
// (it ignores subsurface->subsurfaces).
// Plus it needs the workaround above to avoid a stack overflow.
subsurface->src_surface->raw_draw_region(
subsurface->src_rect,
*this,
subsurface->dst_rect.get_xy()
);
subsurface = nullptr;
}
clear_subsurfaces();
}
if (this->internal_surface != nullptr) {
// The source surface is not empty: draw it onto the destination.
SDL_SetSurfaceBlendMode(
this->internal_surface.get(),
get_sdl_blend_mode()
);
SDL_BlitSurface(
this->internal_surface.get(),
region.get_internal_rect(),
dst_surface.internal_surface.get(),
Rectangle(dst_position).get_internal_rect()
);
}
else if (internal_color != nullptr) { // No internal surface to draw: this may be a color.
if (get_blend_mode() == BlendMode::BLEND && internal_color->get_alpha() == 255) {
// Fill with opaque color: we can directly modify the destination pixels.
Rectangle dst_rect(
dst_position,
region.get_size()
);
SDL_FillRect(
dst_surface.internal_surface.get(),
dst_rect.get_internal_rect(),
get_color_value(*internal_color)
);
}
else {
// Fill with semi-transparent pixels: perform alpha-blending.
create_software_surface();
SDL_FillRect(
this->internal_surface.get(),
nullptr,
get_color_value(*internal_color)
);
SDL_BlitSurface(
this->internal_surface.get(),
region.get_internal_rect(),
dst_surface.internal_surface.get(),
Rectangle(dst_position).get_internal_rect()
);
}
}
}
else {
// The destination is a GPU surface (a texture).
// Do not draw anything, just store the operation in the tree instead.
// The actual drawing will be done at rendering time in GPU.
SurfacePtr src_surface = std::static_pointer_cast<Surface>(shared_from_this());
dst_surface.add_subsurface(src_surface, region, dst_position);
}
dst_surface.is_rendered = false;
}
/**
* \brief Draws a subrectangle of this surface on another surface.
* \param region The subrectangle to draw in this object.
* \param dst_surface The destination surface.
* \param dst_position Coordinates on the destination surface.
* The width and height of this rectangle are ignored.
*/
void Surface::raw_draw_region(
const Rectangle& region,
Surface& dst_surface,
const Rectangle& dst_position) {
if (dst_surface.software_destination // The destination surface is in RAM.
|| !Video::is_acceleration_enabled() // The rendering is in RAM.
) {
if (dst_surface.internal_surface == NULL) {
dst_surface.create_software_surface();
}
// First, draw subsurfaces if any.
// They can exist if the video mode recently switched from an accelerated
// one to a software one.
if (!subsurfaces.empty()) {
if (this->internal_surface == NULL) {
create_software_surface();
}
std::vector<SubSurfaceNode*> subsurfaces = this->subsurfaces;
this->subsurfaces.clear(); // Avoid infinite recursive calls if there are cycles.
std::vector<SubSurfaceNode*>::const_iterator it;
const std::vector<SubSurfaceNode*>::const_iterator end = subsurfaces.end();
for (it = subsurfaces.begin(); it != end; ++it) {
SubSurfaceNode* subsurface = *it;
// TODO draw the subsurfaces of the whole tree recursively instead.
// The current version is not correct because it handles only one level
// (it ignores subsurface->subsurfaces).
// Plus it needs the workaround above to avoid a stack overflow.
subsurface->src_surface->raw_draw_region(
subsurface->src_rect,
*this,
subsurface->dst_rect
);
RefCountable::unref(subsurface);
}
clear_subsurfaces();
}
if (this->internal_surface != NULL) {
// The source surface is not empty: draw it onto the destination.
SDL_BlitSurface(
this->internal_surface,
region.get_internal_rect(),
dst_surface.internal_surface,
Rectangle(dst_position).get_internal_rect()
);
}
else if (internal_color != NULL) { // No internal surface to draw: this may be a color.
if (internal_color->get_internal_color()->a == 255) {
// Fill with opaque color: we can directly modify the destination pixels.
Rectangle dst_rect(
dst_position.get_x(), dst_position.get_y(),
region.get_width(), region.get_height()
);
SDL_FillRect(
dst_surface.internal_surface,
dst_rect.get_internal_rect(),
this->internal_color->get_internal_value()
);
}
else {
// Fill with semi-transparent pixels: perform alpha-blending.
create_software_surface();
SDL_FillRect(
this->internal_surface,
NULL,
this->internal_color->get_internal_value()
);
SDL_BlitSurface(
this->internal_surface,
region.get_internal_rect(),
dst_surface.internal_surface,
Rectangle(dst_position).get_internal_rect()
);
}
}
}
else {
// The destination is a GPU surface (a texture).
// Do not draw anything, just store the operation in the tree instead.
// The actual drawing will be done at rendering time in GPU.
dst_surface.add_subsurface(*this, region, dst_position);
}
dst_surface.is_rendered = false;
}
