Cleaned up some duplicated pixel format-related code in Font files.

--HG--
branch : minor

src/common/pixelformat.cpp

@@ -45,6 +45,8 @@ static StringMap<PixelFormat, PIXELFORMAT_MAX_ENUM>::Entry formatEntries[] =
 	{ "rg32f",   PIXELFORMAT_RG32F   },
 	{ "rgba32f", PIXELFORMAT_RGBA32F },
 
+	{ "la8",     PIXELFORMAT_LA8     },
+
 	{ "rgba4",    PIXELFORMAT_RGBA4    },
 	{ "rgb5a1",   PIXELFORMAT_RGB5A1   },
 	{ "rgb565",   PIXELFORMAT_RGB565   },
@@ -119,6 +121,7 @@ size_t getPixelFormatSize(PixelFormat format)
 	case PIXELFORMAT_RG8:
 	case PIXELFORMAT_R16:
 	case PIXELFORMAT_R16F:
+	case PIXELFORMAT_LA8:
 	case PIXELFORMAT_RGBA4:
 	case PIXELFORMAT_RGB5A1:
 	case PIXELFORMAT_RGB565:

src/common/pixelformat.h

@@ -48,6 +48,8 @@ enum PixelFormat
 	PIXELFORMAT_RG32F,
 	PIXELFORMAT_RGBA32F,
 
+	PIXELFORMAT_LA8, // Same as RG8, but accessed as (L, L, L, A)
+
 	// packed formats
 	PIXELFORMAT_RGBA4,
 	PIXELFORMAT_RGB5A1,

src/modules/font/BMFontRasterizer.cpp

@@ -291,17 +291,17 @@ GlyphData *BMFontRasterizer::getGlyphData(uint32 glyph) const
 
 	// Return an empty GlyphData if we don't have the glyph character.
 	if (it == characters.end())
-		return new GlyphData(glyph, GlyphMetrics(), GlyphData::FORMAT_RGBA);
+		return new GlyphData(glyph, GlyphMetrics(), PIXELFORMAT_RGBA8);
 
 	const BMFontCharacter &c = it->second;
-	GlyphData *g = new GlyphData(glyph, c.metrics, GlyphData::FORMAT_RGBA);
+	GlyphData *g = new GlyphData(glyph, c.metrics, PIXELFORMAT_RGBA8);
 
 	const auto &imagepair = images.find(c.page);
 
 	if (imagepair == images.end())
 	{
 		g->release();
-		return new GlyphData(glyph, GlyphMetrics(), GlyphData::FORMAT_RGBA);
+		return new GlyphData(glyph, GlyphMetrics(), PIXELFORMAT_RGBA8);
 	}
 
 	image::ImageData *imagedata = imagepair->second.get();
@@ -343,6 +343,11 @@ float BMFontRasterizer::getKerning(uint32 leftglyph, uint32 rightglyph) const
 	return 0.0f;
 }
 
+Rasterizer::DataType BMFontRasterizer::getDataType() const
+{
+	return DATA_IMAGE;
+}
+
 bool BMFontRasterizer::accepts(love::filesystem::FileData *fontdef)
 {
 	const char *data = (const char *) fontdef->getData();

src/modules/font/BMFontRasterizer.h

@@ -51,6 +51,7 @@ public:
 	int getGlyphCount() const override;
 	bool hasGlyph(uint32 glyph) const override;
 	float getKerning(uint32 leftglyph, uint32 rightglyph) const override;
+	DataType getDataType() const override;
 
 	static bool accepts(love::filesystem::FileData *fontdef);
 

src/modules/font/GlyphData.cpp

@@ -35,12 +35,15 @@ namespace font
 
 love::Type GlyphData::type("GlyphData", &Data::type);
 
-GlyphData::GlyphData(uint32 glyph, GlyphMetrics glyphMetrics, GlyphData::Format f)
+GlyphData::GlyphData(uint32 glyph, GlyphMetrics glyphMetrics, PixelFormat f)
 	: glyph(glyph)
 	, metrics(glyphMetrics)
 	, data(nullptr)
 	, format(f)
 {
+	if (f != PIXELFORMAT_LA8 && f != PIXELFORMAT_RGBA8)
+		throw love::Exception("Invalid GlyphData pixel format.");
+
 	if (metrics.width > 0 && metrics.height > 0)
 		data = new uint8[metrics.width * metrics.height * getPixelSize()];
 }
@@ -57,14 +60,7 @@ void *GlyphData::getData() const
 
 size_t GlyphData::getPixelSize() const
 {
-	switch (format)
-	{
-	case FORMAT_LUMINANCE_ALPHA:
-		return 2;
-	case FORMAT_RGBA:
-	default:
-		return 4;
-	}
+	return getPixelFormatSize(format);
 }
 
 void *GlyphData::getData(int x, int y) const
@@ -150,28 +146,10 @@ int GlyphData::getMaxY() const
 	return getBearingY();
 }
 
-GlyphData::Format GlyphData::getFormat() const
+PixelFormat GlyphData::getFormat() const
 {
 	return format;
 }
 
-bool GlyphData::getConstant(const char *in, GlyphData::Format &out)
-{
-	return formats.find(in, out);
-}
-
-bool GlyphData::getConstant(GlyphData::Format in, const char *&out)
-{
-	return formats.find(in, out);
-}
-
-StringMap<GlyphData::Format, GlyphData::FORMAT_MAX_ENUM>::Entry GlyphData::formatEntries[] =
-{
-	{"luminancealpha", FORMAT_LUMINANCE_ALPHA},
-	{"rgba", FORMAT_RGBA},
-};
-
-StringMap<GlyphData::Format, GlyphData::FORMAT_MAX_ENUM> GlyphData::formats(GlyphData::formatEntries, sizeof(GlyphData::formatEntries));
-
 } // font
 } // love

src/modules/font/GlyphData.h

@@ -27,6 +27,7 @@
 #include "common/Exception.h"
 #include "common/StringMap.h"
 #include "common/int.h"
+#include "common/pixelformat.h"
 
 // stdlib
 #include <string>
@@ -57,14 +58,7 @@ public:
 
 	static love::Type type;
 
-	enum Format
-	{
-		FORMAT_LUMINANCE_ALPHA,
-		FORMAT_RGBA,
-		FORMAT_MAX_ENUM
-	};
-
-	GlyphData(uint32 glyph, GlyphMetrics glyphMetrics, Format f);
+	GlyphData(uint32 glyph, GlyphMetrics glyphMetrics, PixelFormat f);
 	virtual ~GlyphData();
 
 	// Implements Data.
@@ -139,10 +133,7 @@ public:
 	/**
 	 * Gets the format of the glyph data.
 	 **/
-	Format getFormat() const;
-
-	static bool getConstant(const char *in, Format &out);
-	static bool getConstant(Format in, const char *&out);
+	PixelFormat getFormat() const;
 
 private:
 
@@ -156,10 +147,7 @@ private:
 	uint8 *data;
 
 	// The format the data's in.
-	Format format;
-
-	static StringMap<Format, FORMAT_MAX_ENUM>::Entry formatEntries[];
-	static StringMap<Format, FORMAT_MAX_ENUM> formats;
+	PixelFormat format;
 
 }; // GlyphData
 

src/modules/font/ImageRasterizer.cpp

@@ -69,7 +69,7 @@ GlyphData *ImageRasterizer::getGlyphData(uint32 glyph) const
 
 	gm.height = metrics.height;
 
-	GlyphData *g = new GlyphData(glyph, gm, GlyphData::FORMAT_RGBA);
+	GlyphData *g = new GlyphData(glyph, gm, PIXELFORMAT_RGBA8);
 
 	if (gm.width == 0)
 		return g;
@@ -149,5 +149,10 @@ bool ImageRasterizer::hasGlyph(uint32 glyph) const
 	return imageGlyphs.find(glyph) != imageGlyphs.end();
 }
 
+Rasterizer::DataType ImageRasterizer::getDataType() const
+{
+	return DATA_IMAGE;
+}
+
 } // font
 } // love

src/modules/font/ImageRasterizer.h

@@ -43,10 +43,12 @@ public:
 	virtual ~ImageRasterizer();
 
 	// Implement Rasterizer
-	virtual int getLineHeight() const;
-	virtual GlyphData *getGlyphData(uint32 glyph) const;
-	virtual int getGlyphCount() const;
-	virtual bool hasGlyph(uint32 glyph) const;
+	int getLineHeight() const override;
+	GlyphData *getGlyphData(uint32 glyph) const override;
+	int getGlyphCount() const override;
+	bool hasGlyph(uint32 glyph) const override;
+	DataType getDataType() const override;
+
 
 private:
 

src/modules/font/Rasterizer.h

@@ -49,6 +49,12 @@ class Rasterizer : public Object
 {
 public:
 
+	enum DataType
+	{
+		DATA_TRUETYPE,
+		DATA_IMAGE,
+	};
+
 	static love::Type type;
 
 	virtual ~Rasterizer();
@@ -112,6 +118,8 @@ public:
 	 **/
 	virtual float getKerning(uint32 leftglyph, uint32 rightglyph) const;
 
+	virtual DataType getDataType() const = 0;
+
 protected:
 
 	FontMetrics metrics;

src/modules/font/freetype/TrueTypeRasterizer.cpp

@@ -108,7 +108,7 @@ GlyphData *TrueTypeRasterizer::getGlyphData(uint32 glyph) const
 	glyphMetrics.width = bitmap.width;
 	glyphMetrics.advance = (int) (ftglyph->advance.x >> 16);
 
-	GlyphData *glyphData = new GlyphData(glyph, glyphMetrics, GlyphData::FORMAT_LUMINANCE_ALPHA);
+	GlyphData *glyphData = new GlyphData(glyph, glyphMetrics, PIXELFORMAT_LA8);
 
 	const uint8 *pixels = bitmap.buffer;
 	uint8 *dest = (uint8 *) glyphData->getData();
@@ -176,6 +176,11 @@ float TrueTypeRasterizer::getKerning(uint32 leftglyph, uint32 rightglyph) const
 	return float(kerning.x >> 6);
 }
 
+Rasterizer::DataType TrueTypeRasterizer::getDataType() const
+{
+	return DATA_TRUETYPE;
+}
+
 bool TrueTypeRasterizer::accepts(FT_Library library, love::Data *data)
 {
 	const FT_Byte *fbase = (const FT_Byte *) data->getData();

src/modules/font/freetype/TrueTypeRasterizer.h

@@ -48,11 +48,12 @@ public:
 	virtual ~TrueTypeRasterizer();
 
 	// Implement Rasterizer
-	virtual int getLineHeight() const;
-	virtual GlyphData *getGlyphData(uint32 glyph) const;
-	virtual int getGlyphCount() const;
-	virtual bool hasGlyph(uint32 glyph) const;
-	virtual float getKerning(uint32 leftglyph, uint32 rightglyph) const;
+	int getLineHeight() const override;
+	GlyphData *getGlyphData(uint32 glyph) const override;
+	int getGlyphCount() const override;
+	bool hasGlyph(uint32 glyph) const override;
+	float getKerning(uint32 leftglyph, uint32 rightglyph) const override;
+	DataType getDataType() const override;
 
 	static bool accepts(FT_Library library, love::Data *data);
 

src/modules/font/wrap_GlyphData.cpp

@@ -108,7 +108,7 @@ int w_GlyphData_getFormat(lua_State *L)
 	GlyphData *t = luax_checkglyphdata(L, 1);
 
 	const char *str;
-	if (!GlyphData::getConstant(t->getFormat(), str))
+	if (!getConstant(t->getFormat(), str))
 		return luaL_error(L, "unknown GlyphData format.");
 
 	lua_pushstring(L, str);

src/modules/graphics/opengl/Font.cpp

@@ -78,7 +78,7 @@ Font::Font(love::font::Rasterizer *r, const Texture::Filter &filter)
 	}
 
 	love::font::GlyphData *gd = r->getGlyphData(32); // Space character.
-	fontType = (gd->getFormat() == font::GlyphData::FORMAT_LUMINANCE_ALPHA) ? FONT_TRUETYPE : FONT_IMAGE;
+	pixelFormat = gd->getFormat();
 	gd->release();
 
 	if (!r->hasGlyph(9)) // No tab character in the Rasterizer.
@@ -114,31 +114,6 @@ Font::TextureSize Font::getNextTextureSize() const
 	return size;
 }
 
-GLenum Font::getTextureFormat(FontType fontType, GLenum *internalformat) const
-{
-	GLenum format = fontType == FONT_TRUETYPE ? GL_LUMINANCE_ALPHA : GL_RGBA;
-	GLenum iformat = fontType == FONT_TRUETYPE ? GL_LUMINANCE8_ALPHA8 : GL_RGBA8;
-
-	if (format == GL_RGBA && isGammaCorrect())
-	{
-		// In ES2, the internalformat and format params of TexImage must match.
-		// ES3 doesn't allow "GL_SRGB_ALPHA" as the internal format. But it also
-		// requires GL_LUMINANCE_ALPHA rather than GL_LUMINANCE8_ALPHA8 as the
-		// internal format, for LA.
-		if (GLAD_ES_VERSION_2_0 && !GLAD_ES_VERSION_3_0)
-			format = iformat = GL_SRGB_ALPHA;
-		else
-			iformat = GL_SRGB8_ALPHA8;
-	}
-	else if (GLAD_ES_VERSION_2_0)
-		iformat = format;
-
-	if (internalformat != nullptr)
-		*internalformat = iformat;
-
-	return format;
-}
-
 void Font::createTexture()
 {
 	auto gfx = Module::getInstance<graphics::Graphics>(Module::M_GRAPHICS);
@@ -146,7 +121,7 @@ void Font::createTexture()
 
 	OpenGL::TempDebugGroup debuggroup("Font create texture");
 
-	size_t bpp = fontType == FONT_TRUETYPE ? 2 : 4;
+	size_t bpp = getPixelFormatSize(pixelFormat);
 
 	size_t prevmemsize = textureMemorySize;
 	if (prevmemsize > 0)
@@ -180,8 +155,8 @@ void Font::createTexture()
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 
-	GLenum internalformat = GL_RGBA;
-	GLenum format = getTextureFormat(fontType, &internalformat);
+	bool sRGB = isGammaCorrect();
+	OpenGL::TextureFormat fmt = gl.convertPixelFormat(pixelFormat, false, sRGB);
 
 	// Initialize the texture with transparent black.
 	std::vector<GLubyte> emptydata(size.width * size.height * bpp, 0);
@@ -189,8 +164,8 @@ void Font::createTexture()
 	// Clear errors before initializing.
 	while (glGetError() != GL_NO_ERROR);
 
-	glTexImage2D(GL_TEXTURE_2D, 0, internalformat, size.width, size.height, 0,
-	             format, GL_UNSIGNED_BYTE, &emptydata[0]);
+	glTexImage2D(GL_TEXTURE_2D, 0, fmt.internalformat, size.width, size.height,
+	             0, fmt.externalformat, fmt.type, &emptydata[0]);
 
 	if (glGetError() != GL_NO_ERROR)
 	{
@@ -233,7 +208,7 @@ love::font::GlyphData *Font::getRasterizerGlyphData(uint32 glyph)
 	if (glyph == 9 && useSpacesAsTab)
 	{
 		love::font::GlyphData *spacegd = rasterizers[0]->getGlyphData(32);
-		love::font::GlyphData::Format fmt = spacegd->getFormat();
+		PixelFormat fmt = spacegd->getFormat();
 
 		love::font::GlyphMetrics gm = {};
 		gm.advance = spacegd->getAdvance() * SPACES_PER_TAB;
@@ -289,12 +264,14 @@ const Font::Glyph &Font::addGlyph(uint32 glyph)
 	// don't waste space for empty glyphs. also fixes a divide by zero bug with ATI drivers
 	if (w > 0 && h > 0)
 	{
-		GLenum format = getTextureFormat(fontType);
+		bool isSRGB = isGammaCorrect();
+		OpenGL::TextureFormat fmt = gl.convertPixelFormat(pixelFormat, false, isSRGB);
+
 		g.texture = textures.back();
 
 		gl.bindTextureToUnit(g.texture, 0, false);
 		glTexSubImage2D(GL_TEXTURE_2D, 0, textureX, textureY, w, h,
-		                format, GL_UNSIGNED_BYTE, gd->getData());
+		                fmt.externalformat, fmt.type, gd->getData());
 
 		double tX     = (double) textureX,     tY      = (double) textureY;
 		double tWidth = (double) textureWidth, tHeight = (double) textureHeight;
@@ -979,7 +956,10 @@ int Font::getDescent() const
 float Font::getBaseline() const
 {
 	// 1.25 is magic line height for true type fonts
-	return (fontType == FONT_TRUETYPE) ? floorf(getHeight() / 1.25f + 0.5f) : 0.0f;
+	if (rasterizers[0]->getDataType() == font::Rasterizer::DATA_TRUETYPE)
+		return floorf(getHeight() / 1.25f + 0.5f);
+	else
+		return 0.0f;
 }
 
 bool Font::hasGlyph(uint32 glyph) const
@@ -1023,7 +1003,7 @@ void Font::setFallbacks(const std::vector<Font *> &fallbacks)
 {
 	for (const Font *f : fallbacks)
 	{
-		if (f->fontType != this->fontType)
+		if (f->rasterizers[0]->getDataType() != this->rasterizers[0]->getDataType())
 			throw love::Exception("Font fallbacks must be of the same font type.");
 	}
 

src/modules/graphics/opengl/Font.h

@@ -188,13 +188,6 @@ public:
 
 private:
 
-	enum FontType
-	{
-		FONT_TRUETYPE,
-		FONT_IMAGE,
-		FONT_UNKNOWN
-	};
-
 	struct Glyph
 	{
 		GLuint texture;
@@ -209,7 +202,6 @@ private:
 	};
 
 	TextureSize getNextTextureSize() const;
-	GLenum getTextureFormat(FontType fontType, GLenum *internalformat = nullptr) const;
 	void createTexture();
 	love::font::GlyphData *getRasterizerGlyphData(uint32 glyph);
 	const Glyph &addGlyph(uint32 glyph);
@@ -234,7 +226,8 @@ private:
 	// map of left/right glyph pairs to horizontal kerning.
 	std::unordered_map<uint64, float> kerning;
 
-	FontType fontType;
+	PixelFormat pixelFormat;
+
 	Texture::Filter filter;
 
 	int textureX, textureY;

src/modules/graphics/opengl/OpenGL.cpp

@@ -812,6 +812,12 @@ OpenGL::TextureFormat OpenGL::convertPixelFormat(PixelFormat pixelformat, bool r
 		f.type = GL_FLOAT;
 		break;
 
+	case PIXELFORMAT_LA8:
+		f.internalformat = GL_LUMINANCE8_ALPHA8;
+		f.externalformat = GL_LUMINANCE_ALPHA;
+		f.type = GL_UNSIGNED_BYTE;
+		break;
+
 	case PIXELFORMAT_RGBA4:
 		f.internalformat = GL_RGBA4;
 		f.externalformat = GL_RGBA;
@@ -965,8 +971,11 @@ OpenGL::TextureFormat OpenGL::convertPixelFormat(PixelFormat pixelformat, bool r
 
 	if (!isPixelFormatCompressed(pixelformat))
 	{
-		if (GLAD_ES_VERSION_2_0 && !GLAD_ES_VERSION_3_0 && !renderbuffer)
+		if (GLAD_ES_VERSION_2_0 && !(GLAD_ES_VERSION_3_0 && pixelformat != PIXELFORMAT_LA8)
+			&& !renderbuffer)
+		{
 			f.internalformat = f.externalformat;
+		}
 
 		if (pixelformat != PIXELFORMAT_sRGBA8)
 			isSRGB = false;
@@ -1048,6 +1057,9 @@ bool OpenGL::isPixelFormatSupported(PixelFormat pixelformat, bool rendertarget,
 		else
 			return false;
 
+	case PIXELFORMAT_LA8:
+		return !rendertarget;
+
 	case PIXELFORMAT_RGBA4:
 	case PIXELFORMAT_RGB5A1:
 		return true;