Move shadow option (for text) from editor/interface to blenfont.

Two new function:
 BLF_shadow: set the level (for blur) and the shadow color.
 BLF_shadow_offset: set the x and y offset for shadow.
		 (this is the current position plus offset)

By default shadow is not enable in the font, so before draw the
text you need call BLF_enable(BLF_SHADOW), also remember disable
the option in the end.

source/blender/blenfont/BLF_api.h

@@ -90,6 +90,21 @@ void BLF_kerning(float space);
 void BLF_enable(int option);
 void BLF_disable(int option);
 
+/*
+ * Shadow options, level is the blur level, can be 3, 5 or 0 and
+ * the other argument are the rgba color.
+ * Take care that shadow need to be enable using BLF_enable!!.
+ */
+void BLF_shadow(int level, float r, float g, float b, float a);
+
+/*
+ * Set the offset for shadow text, this is the current cursor
+ * position plus this offset, don't need call BLF_position before
+ * this function, the current position is calculate only on
+ * BLF_draw, so it's safe call this whenever you like.
+ */
+void BLF_shadow_offset(int x, int y);
+
 /*
  * Search the path directory to the locale files, this try all
  * the case for Linux, Win and Mac.
@@ -119,6 +134,7 @@ void BLF_dir_free(char **dirs, int count);
 #define BLF_CLIPPING (1<<1)
 #define BLF_FONT_KERNING (1<<2)
 #define BLF_USER_KERNING (1<<3)
+#define BLF_SHADOW (1<<4)
 
 /* font->mode. */
 #define BLF_MODE_TEXTURE 0

source/blender/blenfont/intern/blf.c

@@ -500,3 +500,28 @@ void BLF_kerning(float space)
 	if (font)
 		font->kerning= space;
 }
+
+void BLF_shadow(int level, float r, float g, float b, float a)
+{
+	FontBLF *font;
+
+	font= global_font[global_font_cur];
+	if (font) {
+		font->shadow= level;
+		font->shadow_col[0]= r;
+		font->shadow_col[1]= g;
+		font->shadow_col[2]= b;
+		font->shadow_col[3]= a;
+	}
+}
+
+void BLF_shadow_offset(int x, int y)
+{
+	FontBLF *font;
+
+	font= global_font[global_font_cur];
+	if (font) {
+		font->shadow_x= x;
+		font->shadow_y= y;
+	}
+}

source/blender/blenfont/intern/blf_glyph.c

@@ -496,8 +496,18 @@ int blf_glyph_texture_render(FontBLF *font, GlyphBLF *g, float x, float y)
 	GLint cur_tex;
 	float dx, dx1;
 	float y1, y2;
+	float xo, yo;
+	float color[4];
 
 	gt= g->tex_data;
+
+	if (font->flags & BLF_SHADOW) {
+		xo= x;
+		yo= y;
+		x += font->shadow_x;
+		y += font->shadow_y;
+	}
+
 	dx= floor(x + gt->pos_x);
 	dx1= dx + gt->width;
 	y1= y + gt->pos_y;
@@ -518,6 +528,27 @@ int blf_glyph_texture_render(FontBLF *font, GlyphBLF *g, float x, float y)
 	if (cur_tex != gt->tex)
 		glBindTexture(GL_TEXTURE_2D, gt->tex);
 
+	if (font->flags & BLF_SHADOW) {
+		glGetFloatv(GL_CURRENT_COLOR, color);
+		glColor4fv(font->shadow_col);
+
+		if (font->shadow == 3)
+			blf_texture3_draw(gt->uv, dx, y1, dx1, y2);
+		else if (font->shadow == 5)
+			blf_texture5_draw(gt->uv, dx, y1, dx1, y2);
+		else
+			blf_texture_draw(gt->uv, dx, y1, dx1, y2);
+
+		glColor4fv(color);
+		x= xo;
+		y= yo;
+
+		dx= floor(x + gt->pos_x);
+		dx1= dx + gt->width;
+		y1= y + gt->pos_y;
+		y2= y + gt->pos_y - gt->height;
+	}
+
 	if (font->blur==3)
 		blf_texture3_draw(gt->uv, dx, y1, dx1, y2);
 	else if (font->blur==5)

source/blender/blenfont/intern/blf_internal_types.h

@@ -154,6 +154,16 @@ typedef struct FontBLF {
 	
 	/* blur: 3 or 5 large kernel */
 	int blur;
+
+	/* shadow level. */
+	int shadow;
+
+	/* and shadow offset. */
+	int shadow_x;
+	int shadow_y;
+
+	/* shadow color. */
+	float shadow_col[4];
 	
 	/* this is the matrix that we load before rotate/scale/translate. */
 	float mat[4][4];

source/blender/editors/interface/interface_style.c

@@ -145,22 +145,6 @@ static uiFont *uifont_to_blfont(int id)
 
 /* *************** draw ************************ */
 
-static void ui_font_shadow_draw(uiFontStyle *fs, int x, int y, char *str)
-{
-	float color[4];
-	
-	glGetFloatv(GL_CURRENT_COLOR, color);
-	
-	glColor4f(fs->shadowcolor, fs->shadowcolor, fs->shadowcolor, fs->shadowalpha);
-	
-	BLF_blur(fs->shadow);
-	BLF_position(x+fs->shadx, y+fs->shady, 0.0f);
-	BLF_draw(str);
-	BLF_blur(0);
-	
-	glColor4fv(color);
-}
-
 void uiStyleFontDraw(uiFontStyle *fs, rcti *rect, char *str)
 {
 	float height;
@@ -179,14 +163,18 @@ void uiStyleFontDraw(uiFontStyle *fs, rcti *rect, char *str)
 	/* clip is very strict, so we give it some space */
 	BLF_clipping(rect->xmin-1, rect->ymin-4, rect->xmax+1, rect->ymax+4);
 	BLF_enable(BLF_CLIPPING);
-	
-	if(fs->shadow) 
-		ui_font_shadow_draw(fs, rect->xmin+xofs, rect->ymin+yofs, str);
-	
 	BLF_position(rect->xmin+xofs, rect->ymin+yofs, 0.0f);
-	BLF_draw(str);
 
+	if (fs->shadow) {
+		BLF_enable(BLF_SHADOW);
+		BLF_shadow(fs->shadow, fs->shadowcolor, fs->shadowcolor, fs->shadowcolor, fs->shadowalpha);
+		BLF_shadow_offset(fs->shadx, fs->shady);
+	}
+
+	BLF_draw(str);
 	BLF_disable(BLF_CLIPPING);
+	if (fs->shadow)
+		BLF_disable(BLF_SHADOW);
 }
 
 /* ************** helpers ************************ */