clan::Image App::get_stencil(clan::Canvas &canvas, clan::Rect rect)
{
canvas.flush();
// For an unknown reason, stencil reads should be a multiple of 32
rect.left = 32 * ((rect.left + 31) / 32);
rect.top = 32 * ((rect.top + 31) / 32);
rect.right = 32 * ((rect.right + 31) / 32);
rect.bottom = 32 * ((rect.bottom + 31) / 32);
int rect_width = rect.get_width();
int rect_height = rect.get_height();
std::vector<unsigned char> buffer;
buffer.resize(rect_width * rect_height);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glPixelStorei(GL_PACK_ROW_LENGTH, rect_width);
glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
glPixelStorei(GL_PACK_SKIP_ROWS, 0);
glReadBuffer(GL_BACK);
if (glClampColor)
{
#ifdef GL_CLAMP_READ_COLOR
glClampColor(GL_CLAMP_READ_COLOR, GL_FALSE);
#else
glClampColor(clan::GL_CLAMP_READ_COLOR, GL_FALSE);
#endif
}
glReadPixels(rect.left, canvas.get_height()- rect.bottom, rect_width, rect_height, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &buffer[0]);
clan::PixelBuffer pbuf(rect_width, rect_height, clan::tf_rgba8);
unsigned int *pdata = (unsigned int *) pbuf.get_data();
unsigned char *rdata = &buffer[0];
for (int ycnt=0; ycnt < rect_height; ycnt++)
{
for (int xcnt=0; xcnt < rect_width; xcnt++)
{
int value = *(rdata++);
if (value == 0)
{
*(pdata++) = 0xFF005500;
}
else
{
value = value * 16;
value = 0xFF000000 | value | (value << 8) | (value << 16);
*(pdata++) = value;
}
}
}
pbuf.flip_vertical();
return clan::Image(canvas, pbuf, pbuf.get_size());
}
void Text::draw(clan::Canvas &canvas, const clan::Rect &rect)
{
int out_draw_offset;
std::string text = build_text(canvas, rect.get_width(), scroller_xoffset, out_draw_offset);
int ypos = rect.bottom - ((rect.get_height() - font_metrics.get_ascent())/2);
// Remove the next line to observe how the clipping works
canvas.set_cliprect(rect);
font.draw_text(canvas, rect.left - out_draw_offset, ypos, text);
canvas.reset_cliprect();
}
clan::Point GridObject::get_dist(clan::ComponentAnchorPoint ap, clan::Point p, clan::Rect boundary)
{
int bw = boundary.get_width(), bh = boundary.get_height();
if (ap == clan::anchor_top_left)
{
return clan::Point(p.x, p.y);
}
else if (ap == clan::anchor_top_right)
{
return clan::Point(bw-p.x, p.y);
}
else if (ap == clan::anchor_bottom_left)
{
return clan::Point(p.x, bh-p.y);
}
else if (ap == clan::anchor_bottom_right)
{
return clan::Point(bw-p.x, bh-p.y);
}
return clan::Point(0,0);
}
void Viewport::CalculateScreenArea(const clan::GraphicContext& gc, clan::Rect &area, bool apply_camera_offset)
{
const clan::Rectf &proportions = GetArea();
area.left = (int)floor(proportions.left * gc.get_width());
area.top = (int)floor(proportions.top * gc.get_height());
area.right = (int)ceil(proportions.right * gc.get_width());
area.bottom = (int)ceil(proportions.bottom * gc.get_height());
if (apply_camera_offset)
{
const CameraPtr &camera = GetCamera();
if (!camera)
FSN_EXCEPT(ExCode::InvalidArgument, "Cannot apply camera offset if the viewport has no camera associated with it");
// Viewport offset is the top-left of the viewport in the game-world,
// i.e. camera_offset - viewport_size * camera_origin
clan::Vec2i viewportOffset =
camera->GetPosition() - clan::Vec2f::calc_origin(clan::origin_center, clan::Sizef((float)area.get_width(), (float)area.get_height()));
area.translate(viewportOffset);
}
}