C++ FontManager::destroyFont方法代码示例

//.........这里部分代码省略.........

	while (!entry::processEvents(width, height, debug, reset) )
	{
		// This dummy draw call is here to make sure that view 0 is cleared
		// if no other draw calls are submitted to view 0.
		bgfx::touch(0);

		int64_t now = bx::getHPCounter();
		static int64_t last = now;
		const int64_t frameTime = now - last;
		last = now;
		const double freq = double(bx::getHPFrequency() );
		const double toMs = 1000.0 / freq;

		// Use debug font to print information about this example.
		bgfx::dbgTextClear();
		bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/10-font");
		bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Use the font system to display text and styled text.");
		bgfx::dbgTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", double(frameTime)*toMs);

		// Use transient text to display debug information.
		wchar_t fpsText[64];
		bx::swnprintf(fpsText, BX_COUNTOF(fpsText), L"Frame: % 7.3f[ms]", double(frameTime) * toMs);

		textBufferManager->clearTextBuffer(transientText);
		textBufferManager->setPenPosition(transientText, width - 150.0f, 10.0f);
		textBufferManager->appendText(transientText, visitor10, L"Transient\n");
		textBufferManager->appendText(transientText, visitor10, L"text buffer\n");
		textBufferManager->appendText(transientText, visitor10, fpsText);

		float at[3]  = { 0, 0,  0.0f };
		float eye[3] = { 0, 0, -1.0f };

		float view[16];
		bx::mtxLookAt(view, eye, at);

		const float centering = 0.5f;

		// Setup a top-left ortho matrix for screen space drawing.
		const bgfx::HMD* hmd = bgfx::getHMD();
		if (NULL != hmd && 0 != (hmd->flags & BGFX_HMD_RENDERING) )
		{
			float proj[16];
			bx::mtxProj(proj, hmd->eye[0].fov, 0.1f, 100.0f);

			static float time = 0.0f;
			time += 0.05f;

			const float dist = 10.0f;
			const float offset0 = -proj[8] + (hmd->eye[0].viewOffset[0] / dist * proj[0]);
			const float offset1 = -proj[8] + (hmd->eye[1].viewOffset[0] / dist * proj[0]);

			float ortho[2][16];
			const float offsetx = width/2.0f;
			bx::mtxOrtho(ortho[0], centering, offsetx + centering, height + centering, centering, -1.0f, 1.0f, offset0);
			bx::mtxOrtho(ortho[1], centering, offsetx + centering, height + centering, centering, -1.0f, 1.0f, offset1);
			bgfx::setViewTransform(0, view, ortho[0], BGFX_VIEW_STEREO, ortho[1]);
			bgfx::setViewRect(0, 0, 0, hmd->width, hmd->height);
		}
		else
		{
			float ortho[16];
			bx::mtxOrtho(ortho, centering, width + centering, height + centering, centering, -1.0f, 1.0f);
			bgfx::setViewTransform(0, view, ortho);
			bgfx::setViewRect(0, 0, 0, width, height);
		}

		// Submit the debug text.
		textBufferManager->submitTextBuffer(transientText, 0);

		// Submit the static text.
		textBufferManager->submitTextBuffer(staticText, 0);

		// Advance to next frame. Rendering thread will be kicked to
		// process submitted rendering primitives.
		bgfx::frame();
	}

	fontManager->destroyTtf(fontAwesomeTtf);
	fontManager->destroyTtf(visitorTtf);

	// Destroy the fonts.
	fontManager->destroyFont(fontAwesome72);
	fontManager->destroyFont(visitor10);
	for (uint32_t ii = 0; ii < numFonts; ++ii)
	{
		fontManager->destroyFont(fonts[ii]);
	}

	textBufferManager->destroyTextBuffer(staticText);
	textBufferManager->destroyTextBuffer(transientText);

	delete textBufferManager;
	delete fontManager;

	// Shutdown bgfx.
	bgfx::shutdown();

	return 0;
}

int _main_(int /*_argc*/, char** /*_argv*/)
{
	uint32_t width = 1280;
	uint32_t height = 720;
	uint32_t debug = BGFX_DEBUG_TEXT;
	uint32_t reset = BGFX_RESET_VSYNC;

	bgfx::init();

	bgfx::reset(width, height, reset);

	// Enable debug text.
	bgfx::setDebug(debug);

	// Set view 0 clear state.
	bgfx::setViewClear(0
		, BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH
		, 0x303030ff
		, 1.0f
		, 0
		);

	// Imgui.
	imguiCreate();

	char* bigText = loadText( "text/sherlock_holmes_a_scandal_in_bohemia_arthur_conan_doyle.txt");

	// Init the text rendering system.
	FontManager* fontManager = new FontManager(512);
	TextBufferManager* textBufferManager = new TextBufferManager(fontManager);

	TrueTypeHandle font = loadTtf(fontManager, "font/special_elite.ttf");

	// Create a distance field font.
	FontHandle fontSdf = fontManager->createFontByPixelSize(font, 0, 48, FONT_TYPE_DISTANCE);

	// Create a scaled down version of the same font (without adding anything to the atlas).
	FontHandle fontScaled = fontManager->createScaledFontToPixelSize(fontSdf, 14);

	TextLineMetrics metrics(fontManager->getFontInfo(fontScaled) );
	uint32_t lineCount = metrics.getLineCount(bigText);

	float visibleLineCount = 20.0f;

	const char* textBegin = 0;
	const char* textEnd = 0;
	metrics.getSubText(bigText, 0, (uint32_t)visibleLineCount, textBegin, textEnd);

	TextBufferHandle scrollableBuffer = textBufferManager->createTextBuffer(FONT_TYPE_DISTANCE, BufferType::Transient);
	textBufferManager->setTextColor(scrollableBuffer, 0xFFFFFFFF);

	textBufferManager->appendText(scrollableBuffer, fontScaled, textBegin, textEnd);

	entry::MouseState mouseState;
	int32_t scrollArea = 0;
	const int32_t guiPanelWidth = 250;
	const int32_t guiPanelHeight = 200;
	float textScroll = 0.0f;
	float textRotation = 0.0f;
	float textScale = 1.0f;
	float textSize = 14.0f;

	while (!entry::processEvents(width, height, debug, reset, &mouseState) )
	{
		imguiBeginFrame(mouseState.m_mx
			, mouseState.m_my
			, (mouseState.m_buttons[entry::MouseButton::Left  ] ? IMGUI_MBUT_LEFT  : 0)
			| (mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT : 0)
			, mouseState.m_mz
			, width
			, height
			);

		imguiBeginScrollArea("Text Area"
			, width - guiPanelWidth - 10
			, 10
			, guiPanelWidth
			, guiPanelHeight
			, &scrollArea
			);
		imguiSeparatorLine();

		bool recomputeVisibleText = false;
		recomputeVisibleText |= imguiSlider("Number of lines", visibleLineCount, 1.0f, 177.0f , 1.0f);
		if (imguiSlider("Font size", textSize, 6.0f, 64.0f , 1.0f) )
		{
			fontManager->destroyFont(fontScaled);
			fontScaled = fontManager->createScaledFontToPixelSize(fontSdf, (uint32_t) textSize);
			metrics = TextLineMetrics(fontManager->getFontInfo(fontScaled) );
			recomputeVisibleText = true;
		}

		recomputeVisibleText |= imguiSlider("Scroll", textScroll, 0.0f, (lineCount-visibleLineCount) , 1.0f);
		imguiSlider("Rotate", textRotation, 0.0f, bx::pi*2.0f , 0.1f);
		recomputeVisibleText |= imguiSlider("Scale", textScale, 0.1f, 10.0f , 0.1f);

		if (recomputeVisibleText)
		{
			textBufferManager->clearTextBuffer(scrollableBuffer);
			metrics.getSubText(bigText,(uint32_t)textScroll, (uint32_t)(textScroll+visibleLineCount), textBegin, textEnd);
//.........这里部分代码省略.........

//.........这里部分代码省略.........
	// Setup style colors.
	textBufferManager->setBackgroundColor(staticText, 0x551111FF);
	textBufferManager->setUnderlineColor(staticText, 0xFF2222FF);
	textBufferManager->setOverlineColor(staticText, 0x2222FFFF);
	textBufferManager->setStrikeThroughColor(staticText, 0x22FF22FF);

	// Background.
	textBufferManager->setStyle(staticText, STYLE_BACKGROUND);
	textBufferManager->appendText(staticText, fonts[0], L"The quick ");

	// Strike-through.
	textBufferManager->setStyle(staticText, STYLE_STRIKE_THROUGH);
	textBufferManager->appendText(staticText, fonts[0], L"brown fox ");

	// Overline.
	textBufferManager->setStyle(staticText, STYLE_OVERLINE);
	textBufferManager->appendText(staticText, fonts[0], L"jumps over ");

	// Underline.
	textBufferManager->setStyle(staticText, STYLE_UNDERLINE);
	textBufferManager->appendText(staticText, fonts[0], L"the lazy ");

	// Background + strike-through.
	textBufferManager->setStyle(staticText, STYLE_BACKGROUND | STYLE_STRIKE_THROUGH);
	textBufferManager->appendText(staticText, fonts[0], L"dog\n");

	// Create a transient buffer for real-time data.
	TextBufferHandle transientText = textBufferManager->createTextBuffer(FONT_TYPE_ALPHA, BufferType::Transient);

	while (!processEvents(width, height, debug, reset) )
	{
		// Set view 0 default viewport.
		bgfx::setViewRect(0, 0, 0, width, height);

		// This dummy draw call is here to make sure that view 0 is cleared
		// if no other draw calls are submitted to view 0.
		bgfx::submit(0);

		int64_t now = bx::getHPCounter();
		static int64_t last = now;
		const int64_t frameTime = now - last;
		last = now;
		const double freq = double(bx::getHPFrequency() );
		const double toMs = 1000.0 / freq;

		// Use transient text to display debug information.
		wchar_t fpsText[64];
		bx::swnprintf(fpsText, countof(fpsText), L"Frame: % 7.3f[ms]", double(frameTime) * toMs);

		textBufferManager->clearTextBuffer(transientText);
		textBufferManager->setPenPosition(transientText, 20.0, 4.0f);
		textBufferManager->appendText(transientText, consola_16, L"bgfx/examples/10-font\n");
		textBufferManager->appendText(transientText, consola_16, L"Description: Use the font system to display text and styled text.\n");
		textBufferManager->appendText(transientText, consola_16, fpsText);

		float at[3] = { 0, 0, 0.0f };
		float eye[3] = {0, 0, -1.0f };

		float view[16];
		float proj[16];
		mtxLookAt(view, eye, at);

		// Setup a top-left ortho matrix for screen space drawing.
		float centering = 0.5f;
		mtxOrtho(proj, centering, width + centering, height + centering, centering, -1.0f, 1.0f);

		// Set view and projection matrix for view 0.
		bgfx::setViewTransform(0, view, proj);

		// Submit the debug text.
		textBufferManager->submitTextBuffer(transientText, 0);

		// Submit the static text.
		textBufferManager->submitTextBuffer(staticText, 0);

		// Advance to next frame. Rendering thread will be kicked to
		// process submitted rendering primitives.
		bgfx::frame();
	}

	fontManager->destroyTtf(console_tt);

	// Destroy the fonts.
	fontManager->destroyFont(consola_16);
	for (uint32_t ii = 0; ii < fontCount; ++ii)
	{
		fontManager->destroyFont(fonts[ii]);
	}

	textBufferManager->destroyTextBuffer(staticText);
	textBufferManager->destroyTextBuffer(transientText);

	delete textBufferManager;
	delete fontManager;

	// Shutdown bgfx.
	bgfx::shutdown();

	return 0;
}