Merge pull request #15780 from volzhs/emoji

Support colored font

1 files changed, 57 insertions, 21 deletions

diff --git a/scene/resources/dynamic_font.cpp b/scene/resources/dynamic_font.cpp
index e9d5ca969e..23c6dc200b 100644
--- a/scene/resources/dynamic_font.cpp
+++ b/scene/resources/dynamic_font.cpp
@@ -186,10 +186,25 @@ Error DynamicFontAtSize::_load() {
 		ERR_FAIL_COND_V( error, ERR_INVALID_PARAMETER );
 	}*/
 
-	error = FT_Set_Pixel_Sizes(face, 0, id.size * oversampling);
+	if (FT_HAS_COLOR(face)) {
+		int best_match = 0;
+		int diff = ABS(id.size - face->available_sizes[0].width);
+		scale_color_font = float(id.size) / face->available_sizes[0].width;
+		for (int i = 1; i < face->num_fixed_sizes; i++) {
+			int ndiff = ABS(id.size - face->available_sizes[i].width);
+			if (ndiff < diff) {
+				best_match = i;
+				diff = ndiff;
+				scale_color_font = float(id.size) / face->available_sizes[i].width;
+			}
+		}
+		error = FT_Select_Size(face, best_match);
+	} else {
+		error = FT_Set_Pixel_Sizes(face, 0, id.size * oversampling);
+	}
 
-	ascent = (face->size->metrics.ascender >> 6) / oversampling;
-	descent = (-face->size->metrics.descender >> 6) / oversampling;
+	ascent = (face->size->metrics.ascender >> 6) / oversampling * scale_color_font;
+	descent = (-face->size->metrics.descender >> 6) / oversampling * scale_color_font;
 	linegap = 0;
 	texture_flags = 0;
 	if (id.mipmaps)
@@ -286,7 +301,6 @@ Size2 DynamicFontAtSize::get_char_size(CharType p_char, CharType p_next, const V
 			ret.x += (delta.x >> 6) / oversampling;
 		}
 	}
-
 	return ret;
 }
 
@@ -328,14 +342,18 @@ float DynamicFontAtSize::draw_char(RID p_canvas_item, const Point2 &p_pos, CharT
 
 			if (!ch->found)
 				continue;
-
 			Point2 cpos = p_pos;
 			cpos.x += ch->h_align;
-			cpos.y -= get_ascent();
+			cpos.y -= fb->get_ascent();
 			cpos.y += ch->v_align;
 			ERR_FAIL_COND_V(ch->texture_idx < -1 || ch->texture_idx >= fb->textures.size(), 0);
-			if (ch->texture_idx != -1)
-				VisualServer::get_singleton()->canvas_item_add_texture_rect_region(p_canvas_item, Rect2(cpos, ch->rect.size), fb->textures[ch->texture_idx].texture->get_rid(), ch->rect_uv, p_modulate, false, RID(), false);
+			if (ch->texture_idx != -1) {
+				Color modulate = p_modulate;
+				if (FT_HAS_COLOR(fb->face)) {
+					modulate.r = modulate.g = modulate.b = 1;
+				}
+				VisualServer::get_singleton()->canvas_item_add_texture_rect_region(p_canvas_item, Rect2(cpos, ch->rect.size * Vector2(fb->scale_color_font, fb->scale_color_font)), fb->textures[ch->texture_idx].texture->get_rid(), ch->rect_uv, modulate, false, RID(), false);
+			}
 			advance = ch->advance;
 			used_fallback = true;
 			break;
@@ -356,8 +374,13 @@ float DynamicFontAtSize::draw_char(RID p_canvas_item, const Point2 &p_pos, CharT
 		cpos.y -= get_ascent();
 		cpos.y += c->v_align;
 		ERR_FAIL_COND_V(c->texture_idx < -1 || c->texture_idx >= textures.size(), 0);
-		if (c->texture_idx != -1)
-			VisualServer::get_singleton()->canvas_item_add_texture_rect_region(p_canvas_item, Rect2(cpos, c->rect.size), textures[c->texture_idx].texture->get_rid(), c->rect_uv, p_modulate, false, RID(), false);
+		if (c->texture_idx != -1) {
+			Color modulate = p_modulate;
+			if (FT_HAS_COLOR(face)) {
+				modulate.r = modulate.g = modulate.b = 1;
+			}
+			VisualServer::get_singleton()->canvas_item_add_texture_rect_region(p_canvas_item, Rect2(cpos, c->rect.size * Vector2(scale_color_font, scale_color_font)), textures[c->texture_idx].texture->get_rid(), c->rect_uv, modulate, false, RID(), false);
+		}
 		advance = c->advance;
 		//textures[c->texture_idx].texture->draw(p_canvas_item,Vector2());
 	}
@@ -431,9 +454,9 @@ void DynamicFontAtSize::_update_char(CharType p_char) {
 		char_map[p_char] = ch;
 		return;
 	}
-	int error = FT_Load_Char(face, p_char, FT_LOAD_RENDER | (font->force_autohinter ? FT_LOAD_FORCE_AUTOHINT : 0));
+	int error = FT_Load_Char(face, p_char, FT_HAS_COLOR(face) ? FT_LOAD_COLOR : FT_LOAD_DEFAULT | (font->force_autohinter ? FT_LOAD_FORCE_AUTOHINT : 0));
 	if (!error) {
-		error = FT_Render_Glyph(face->glyph, ft_render_mode_normal);
+		error = FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
 	}
 	if (error) {
 
@@ -470,6 +493,8 @@ void DynamicFontAtSize::_update_char(CharType p_char) {
 
 	//find a texture to fit this...
 
+	int color_size = slot->bitmap.pixel_mode == FT_PIXEL_MODE_BGRA ? 4 : 2;
+	Image::Format require_format = color_size == 4 ? Image::FORMAT_RGBA8 : Image::FORMAT_LA8;
 	int tex_index = -1;
 	int tex_x = 0;
 	int tex_y = 0;
@@ -478,6 +503,9 @@ void DynamicFontAtSize::_update_char(CharType p_char) {
 
 		CharTexture &ct = textures[i];
 
+		if (ct.texture->get_format() != require_format)
+			continue;
+
 		if (mw > ct.texture_size || mh > ct.texture_size) //too big for this texture
 			continue;
 
@@ -527,13 +555,13 @@ void DynamicFontAtSize::_update_char(CharType p_char) {
 
 		CharTexture tex;
 		tex.texture_size = texsize;
-		tex.imgdata.resize(texsize * texsize * 2); //grayscale alpha
+		tex.imgdata.resize(texsize * texsize * color_size);
 
 		{
 			//zero texture
 			PoolVector<uint8_t>::Write w = tex.imgdata.write();
-			ERR_FAIL_COND(texsize * texsize * 2 > tex.imgdata.size());
-			for (int i = 0; i < texsize * texsize * 2; i++) {
+			ERR_FAIL_COND(texsize * texsize * color_size > tex.imgdata.size());
+			for (int i = 0; i < texsize * texsize * color_size; i++) {
 				w[i] = 0;
 			}
 		}
@@ -555,7 +583,7 @@ void DynamicFontAtSize::_update_char(CharType p_char) {
 		for (int i = 0; i < h; i++) {
 			for (int j = 0; j < w; j++) {
 
-				int ofs = ((i + tex_y + rect_margin) * tex.texture_size + j + tex_x + rect_margin) * 2;
+				int ofs = ((i + tex_y + rect_margin) * tex.texture_size + j + tex_x + rect_margin) * color_size;
 				ERR_FAIL_COND(ofs >= tex.imgdata.size());
 				switch (slot->bitmap.pixel_mode) {
 					case FT_PIXEL_MODE_MONO: {
@@ -568,7 +596,14 @@ void DynamicFontAtSize::_update_char(CharType p_char) {
 						wr[ofs + 0] = 255; //grayscale as 1
 						wr[ofs + 1] = slot->bitmap.buffer[i * slot->bitmap.pitch + j];
 						break;
-					// TODO: FT_PIXEL_MODE_LCD, FT_PIXEL_MODE_BGRA
+					case FT_PIXEL_MODE_BGRA: {
+						int ofs_color = i * slot->bitmap.pitch + (j << 2);
+						wr[ofs + 2] = slot->bitmap.buffer[ofs_color + 0];
+						wr[ofs + 1] = slot->bitmap.buffer[ofs_color + 1];
+						wr[ofs + 0] = slot->bitmap.buffer[ofs_color + 2];
+						wr[ofs + 3] = slot->bitmap.buffer[ofs_color + 3];
+					} break;
+					// TODO: FT_PIXEL_MODE_LCD
 					default:
 						ERR_EXPLAIN("Font uses unsupported pixel format: " + itos(slot->bitmap.pixel_mode));
 						ERR_FAIL();
@@ -581,7 +616,7 @@ void DynamicFontAtSize::_update_char(CharType p_char) {
 	//blit to image and texture
 	{
 
-		Ref<Image> img = memnew(Image(tex.texture_size, tex.texture_size, 0, Image::FORMAT_LA8, tex.imgdata));
+		Ref<Image> img = memnew(Image(tex.texture_size, tex.texture_size, 0, require_format, tex.imgdata));
 
 		if (tex.texture.is_null()) {
 			tex.texture.instance();
@@ -599,9 +634,9 @@ void DynamicFontAtSize::_update_char(CharType p_char) {
 	}
 
 	Character chr;
-	chr.h_align = xofs / oversampling;
-	chr.v_align = ascent - (yofs / oversampling); // + ascent - descent;
-	chr.advance = advance / oversampling;
+	chr.h_align = xofs * scale_color_font / oversampling;
+	chr.v_align = ascent - (yofs * scale_color_font / oversampling); // + ascent - descent;
+	chr.advance = advance * scale_color_font / oversampling;
 	chr.texture_idx = tex_index;
 	chr.found = true;
 
@@ -640,6 +675,7 @@ DynamicFontAtSize::DynamicFontAtSize() {
 	linegap = 1;
 	texture_flags = 0;
 	oversampling = font_oversampling;
+	scale_color_font = 1;
 }
 
 DynamicFontAtSize::~DynamicFontAtSize() {