C++ Texture::GetSize方法代码示例

void TextureAtlasLoader::LoadTexture (const std::string& filename, TextureAtlas* texAtlas)
{
	Texture* texture = Resources::LoadTexture (filename);

	texAtlas->SetName (texture->GetName ());
	texAtlas->SetSize (texture->GetSize ());
	texAtlas->SetPixels (texture->GetPixels (), 4u * texture->GetSize ().width * texture->GetSize ().height);
}

	void TextSprite::OnAtlasLayerChange(const AbstractAtlas* atlas, AbstractImage* oldLayer, AbstractImage* newLayer)
	{
		NazaraUnused(atlas);

		#ifdef NAZARA_DEBUG
		if (m_atlases.find(atlas) == m_atlases.end())
		{
			NazaraInternalError("Not listening to " + String::Pointer(atlas));
			return;
		}
		#endif

		// The texture of an atlas have just been recreated (size change)
		// we have to adjust the coordinates of the texture and the rendering texture
		Texture* oldTexture = static_cast<Texture*>(oldLayer);
		Texture* newTexture = static_cast<Texture*>(newLayer);

		// It is possible that we don't use the texture (the atlas warning us for each of its layers)
		auto it = m_renderInfos.find(oldTexture);
		if (it != m_renderInfos.end())
		{
			// We indeed use this texture, we have to update its coordinates
			RenderIndices indices = std::move(it->second);

			Vector2ui oldSize(oldTexture->GetSize());
			Vector2ui newSize(newTexture->GetSize());
			Vector2f scale = Vector2f(oldSize) / Vector2f(newSize); // ratio of the old one to the new one

			// Now we will iterate through each coordinates of the concerned texture to multiply them by the ratio
			SparsePtr<Vector2f> texCoordPtr(&m_localVertices[indices.first].uv, sizeof(VertexStruct_XYZ_Color_UV));
			for (unsigned int i = 0; i < indices.count; ++i)
			{
				for (unsigned int j = 0; j < 4; ++j)
					m_localVertices[i*4 + j].uv *= scale;
			}

			// We get rid off the old texture and we set the new one at the place (same for indices)
			m_renderInfos.erase(it);
			m_renderInfos.insert(std::make_pair(newTexture, std::move(indices)));
		}
	}

void Draw( const Texture &tex, Point pos, int curFrame /*= 0*/, Color color /*= Color::make_white()*/ )
{
  Draw( tex, Rect( pos, tex.GetSize()), curFrame, color );
}

//.........这里部分代码省略.........
				++atlasIt;
		}

		std::size_t glyphCount = drawer.GetGlyphCount();
		m_localVertices.resize(glyphCount * 4);

		// Reset glyph count for every texture to zero
		for (auto& pair : m_renderInfos)
			pair.second.count = 0;

		// Count glyph count for each texture
		Texture* lastTexture = nullptr;
		unsigned int* count = nullptr;
		for (std::size_t i = 0; i < glyphCount; ++i)
		{
			const AbstractTextDrawer::Glyph& glyph = drawer.GetGlyph(i);

			Texture* texture = static_cast<Texture*>(glyph.atlas);
			if (lastTexture != texture)
			{
				auto it = m_renderInfos.find(texture);
				if (it == m_renderInfos.end())
					it = m_renderInfos.insert(std::make_pair(texture, RenderIndices{0U, 0U})).first;

				count = &it->second.count;
				lastTexture = texture;
			}

			(*count)++;
		}

		// Attributes indices and reinitialize glyph count to zero to use it as a counter in the next loop
		// This is because the 1st glyph can use texture A, the 2nd glyph can use texture B and the 3th glyph C can use texture A again
		// so we need a counter to know where to write informations
		// also remove unused render infos
		unsigned int index = 0;
		auto infoIt = m_renderInfos.begin();
		while (infoIt != m_renderInfos.end())
		{
			RenderIndices& indices = infoIt->second;
			if (indices.count == 0)
				m_renderInfos.erase(infoIt++); //< No glyph uses this texture, remove from indices
			else
			{
				indices.first = index;

				index += indices.count;
				indices.count = 0;
				++infoIt;
			}
		}

		lastTexture = nullptr;
		RenderIndices* indices = nullptr;
		for (unsigned int i = 0; i < glyphCount; ++i)
		{
			const AbstractTextDrawer::Glyph& glyph = drawer.GetGlyph(i);

			Texture* texture = static_cast<Texture*>(glyph.atlas);
			if (lastTexture != texture)
			{
				indices = &m_renderInfos[texture]; //< We changed texture, adjust the pointer
				lastTexture = texture;
			}

			// First, compute the uv coordinates from our atlas rect
			Vector2ui size(texture->GetSize());
			float invWidth = 1.f / size.x;
			float invHeight = 1.f / size.y;

			Rectf uvRect(glyph.atlasRect);
			uvRect.x *= invWidth;
			uvRect.y *= invHeight;
			uvRect.width *= invWidth;
			uvRect.height *= invHeight;

			// Our glyph may be flipped in the atlas, to render it correctly we need to change the uv coordinates accordingly
			const RectCorner normalCorners[4] = {RectCorner_LeftTop, RectCorner_RightTop, RectCorner_LeftBottom, RectCorner_RightBottom};
			const RectCorner flippedCorners[4] = {RectCorner_LeftBottom, RectCorner_LeftTop, RectCorner_RightBottom, RectCorner_RightTop};

			// Set the position, color and UV of our vertices
			for (unsigned int j = 0; j < 4; ++j)
			{
				// Remember that indices->count is a counter here, not a count value
				m_localVertices[indices->count * 4 + j].color = glyph.color;
				m_localVertices[indices->count * 4 + j].position.Set(glyph.corners[j]);
				m_localVertices[indices->count * 4 + j].uv.Set(uvRect.GetCorner((glyph.flipped) ? flippedCorners[j] : normalCorners[j]));
			}

			// Increment the counter, go to next glyph
			indices->count++;
		}

		m_localBounds = drawer.GetBounds();

		InvalidateBoundingVolume();
		InvalidateInstanceData(0);

		clearOnFail.Reset();
	}