Magic_Game/src/kiwano/2d/Canvas.cpp

// Copyright (c) 2016-2018 Kiwano - Nomango
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include <kiwano/2d/Canvas.h>
#include <kiwano/core/Logger.h>
#include <kiwano/render/Renderer.h>

namespace kiwano
{
	Canvas::Canvas()
		: cache_expired_(false)
		, stroke_width_(1.0f)
		, stroke_style_()
	{
	}

	Canvas::~Canvas()
	{
	}

	void Canvas::BeginDraw()
	{
		InitRenderTargetAndBrushs();
		ctx_->BeginDraw();
	}

	void Canvas::EndDraw()
	{
		InitRenderTargetAndBrushs();
		ctx_->EndDraw();
		cache_expired_ = true;
	}

	void Canvas::OnRender(RenderContext& ctx)
	{
		UpdateCache();
		
		if (texture_cached_ && texture_cached_->IsValid())
		{
			PrepareToRender(ctx);

			Rect bitmap_rect(0.f, 0.f, texture_cached_->GetWidth(), texture_cached_->GetHeight());
			ctx.DrawTexture(*texture_cached_, bitmap_rect, bitmap_rect);
		}
	}

	void Canvas::SetBrush(BrushPtr brush)
	{
		InitRenderTargetAndBrushs();
		ctx_->SetCurrentBrush(brush);
	}

	float Canvas::GetStrokeWidth() const
	{
		return stroke_width_;
	}

	void Canvas::SetBrushTransform(Transform const& transform)
	{
		InitRenderTargetAndBrushs();
		ctx_->SetTransform(transform.ToMatrix());
	}

	void Canvas::SetBrushTransform(Matrix3x2 const & transform)
	{
		InitRenderTargetAndBrushs();
		ctx_->SetTransform(transform);
	}

	void Canvas::PushLayerArea(LayerArea& area)
	{
		InitRenderTargetAndBrushs();
		ctx_->PushLayer(area);
	}

	void Canvas::PopLayerArea()
	{
		InitRenderTargetAndBrushs();
		ctx_->PopLayer();
	}

	void Canvas::PushClipRect(Rect const& clip_rect)
	{
		InitRenderTargetAndBrushs();
		ctx_->PushClipRect(clip_rect);
	}

	void Canvas::PopClipRect()
	{
		InitRenderTargetAndBrushs();
		ctx_->PopClipRect();
	}

	void Canvas::DrawLine(Point const& begin, Point const& end)
	{
		InitRenderTargetAndBrushs();
		ctx_->SetCurrentBrush(stroke_brush_);
		ctx_->DrawLine(
			begin,
			end,
			stroke_width_,
			stroke_style_
		);
		cache_expired_ = true;
	}

	void Canvas::DrawCircle(Point const& center, float radius)
	{
		InitRenderTargetAndBrushs();
		ctx_->SetCurrentBrush(stroke_brush_);
		ctx_->DrawEllipse(
			center,
			Vec2(radius, radius),
			stroke_width_,
			stroke_style_
		);
		cache_expired_ = true;
	}

	void Canvas::DrawEllipse(Point const& center, Vec2 const& radius)
	{
		InitRenderTargetAndBrushs();
		ctx_->SetCurrentBrush(stroke_brush_);
		ctx_->DrawEllipse(
			center,
			radius,
			stroke_width_,
			stroke_style_
		);
		cache_expired_ = true;
	}

	void Canvas::DrawRect(Rect const& rect)
	{
		InitRenderTargetAndBrushs();
		ctx_->SetCurrentBrush(stroke_brush_);
		ctx_->DrawRectangle(
			rect,
			stroke_width_,
			stroke_style_
		);
		cache_expired_ = true;
	}

	void Canvas::DrawRoundedRect(Rect const& rect, Vec2 const& radius)
	{
		InitRenderTargetAndBrushs();
		ctx_->SetCurrentBrush(stroke_brush_);
		ctx_->DrawRoundedRectangle(
			rect,
			radius,
			stroke_width_,
			stroke_style_
		);
		cache_expired_ = true;
	}

	void Canvas::FillCircle(Point const& center, float radius)
	{
		InitRenderTargetAndBrushs();
		ctx_->SetCurrentBrush(fill_brush_);
		ctx_->FillEllipse(
			center,
			Vec2(radius, radius)
		);
		cache_expired_ = true;
	}

	void Canvas::FillEllipse(Point const& center, Vec2 const& radius)
	{
		InitRenderTargetAndBrushs();
		ctx_->SetCurrentBrush(fill_brush_);
		ctx_->FillEllipse(
			center,
			radius
		);
		cache_expired_ = true;
	}

	void Canvas::FillRect(Rect const& rect)
	{
		InitRenderTargetAndBrushs();
		ctx_->SetCurrentBrush(fill_brush_);
		ctx_->FillRectangle(
			rect
		);
		cache_expired_ = true;
	}

	void Canvas::FillRoundedRect(Rect const& rect, Vec2 const& radius)
	{
		InitRenderTargetAndBrushs();
		ctx_->SetCurrentBrush(fill_brush_);
		ctx_->FillRoundedRectangle(
			rect,
			radius
		);
		cache_expired_ = true;
	}

	void Canvas::DrawTexture(TexturePtr texture, const Rect* src_rect, const Rect* dest_rect)
	{
		if (texture)
		{
			InitRenderTargetAndBrushs();
			ctx_->DrawTexture(*texture, src_rect, dest_rect);
			cache_expired_ = true;
		}
	}

	void Canvas::DrawTextLayout(String const& text, Point const& point)
	{
		if (text.empty())
			return;

		TextLayout layout;
		layout.SetStyle(text_style_);
		layout.SetText(text);
		DrawTextLayout(layout, point);
	}

	void Canvas::DrawTextLayout(TextLayout const& layout, Point const& point)
	{
		InitRenderTargetAndBrushs();
		ctx_->DrawTextLayout(layout, point);
	}

	void Canvas::BeginPath(Point const& begin_pos)
	{
		geo_sink_.BeginPath(begin_pos);
	}

	void Canvas::EndPath(bool closed)
	{
		geo_sink_.EndPath(closed);
	}

	void Canvas::AddLine(Point const & point)
	{
		geo_sink_.AddLine(point);
	}

	void Canvas::AddLines(Vector<Point> const& points)
	{
		geo_sink_.AddLines(points);
	}

	void Canvas::AddBezier(Point const & point1, Point const & point2, Point const & point3)
	{
		geo_sink_.AddBezier(point1, point2, point3);
	}

	void Canvas::AddArc(Point const & point, Size const & radius, float rotation, bool clockwise, bool is_small)
	{
		geo_sink_.AddArc(point, radius, rotation, clockwise, is_small);
	}

	void Canvas::StrokePath()
	{
		InitRenderTargetAndBrushs();
		ctx_->SetCurrentBrush(stroke_brush_);
		ctx_->DrawGeometry(
			geo_sink_.GetGeometry(),
			stroke_width_,
			stroke_style_
		);
		cache_expired_ = true;
	}

	void Canvas::FillPath()
	{
		InitRenderTargetAndBrushs();
		ctx_->SetCurrentBrush(fill_brush_);
		ctx_->FillGeometry(
			geo_sink_.GetGeometry()
		);
		cache_expired_ = true;
	}

	void Canvas::Clear()
	{
		InitRenderTargetAndBrushs();
		ctx_->Clear();
		cache_expired_ = true;
	}

	void Canvas::Clear(Color const& clear_color)
	{
		InitRenderTargetAndBrushs();
		ctx_->Clear(clear_color);
		cache_expired_ = true;
	}

	TexturePtr Canvas::ExportToTexture() const
	{
		UpdateCache();
		return texture_cached_;
	}

	void Canvas::InitRenderTargetAndBrushs()
	{
		if (!ctx_)
		{
			Renderer::Instance().CreateTextureRenderTarget(ctx_);
		}

		if (!stroke_brush_)
		{
			stroke_brush_ = new Brush;
			stroke_brush_->SetColor(Color::White);
		}

		if (!fill_brush_)
		{
			fill_brush_ = new Brush;
			fill_brush_->SetColor(Color::White);
		}
	}

	void Canvas::UpdateCache() const
	{
		if (cache_expired_ && ctx_)
		{
			if (!texture_cached_)
			{
				texture_cached_ = new Texture;
			}

			if (ctx_->GetOutput(*texture_cached_))
			{
				cache_expired_ = false;
			}
		}
	}

}