Add the possibility to set a 4x4 matrix to be used on blf.

This option allow the user to set a 4x4 matrix to be
multiplied before draw the text, for example:

	double *m;

	/* Get the matrix or build it! */

	BLF_matrix(m);
	BLF_enable(BLF_MATRIX);

	/* set color, size, etc and draw! */

	BLF_disable(BLF_MATRIX);

You don't need the last line (disable), but remember
that if you use the font to draw in any other place,
the matrix will be used!.

The GL code is:

	glPushMatrix();
	glMultMatrixd(m);
	glTranslatef();
	glScalef();
	glRotatef();

	glPopMatrix();

Let's Dalai test this!!! :D

1 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/blenfont/BLF_api.h b/source/blender/blenfont/BLF_api.h
index d32922f2429..84086742b15 100644
--- a/source/blender/blenfont/BLF_api.h
+++ b/source/blender/blenfont/BLF_api.h
@@ -49,6 +49,20 @@ void BLF_aspect(int fontid, float aspect);
 void BLF_position(int fontid, float x, float y, float z);
 void BLF_size(int fontid, int size, int dpi);
 
+/* Set a 4x4 matrix to be multiplied before draw the text.
+ * Remember that you need call BLF_enable(BLF_MATRIX)
+ * to enable this.
+ *
+ * The order of the matrix is like GL:
+
+	| m[0]  m[4]  m[8]  m[12] |
+	| m[1]  m[5]  m[9]  m[13] |
+	| m[2]  m[6]  m[10] m[14] |
+	| m[3]  m[7]  m[11] m[15] |
+
+ */
+void BLF_matrix(int fontid, double *m);
+
 /* Draw the string using the default font, size and dpi. */
 void BLF_draw_default(float x, float y, float z, const char *str, size_t len);
 void BLF_draw_default_ascii(float x, float y, float z, const char *str, size_t len);
@@ -180,6 +194,7 @@ void BLF_dir_free(char **dirs, int count);
 #define BLF_CLIPPING (1<<1)
 #define BLF_SHADOW (1<<2)
 #define BLF_KERNING_DEFAULT (1<<3)
+#define BLF_MATRIX (1<<4)
 
 // XXX, bad design
 extern int blf_mono_font;