From 03acdd75e0c75b78bdf5c2c23bcf6c8cf40cb459 Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Sun, 21 Mar 2010 00:25:52 +0000
Subject: [#21660] improved UV test grid from shuvro sarker (shuvro) Added text
 to the patch and made other minor tweaks.

moved image generation functions into their own file.
---
 source/blender/blenkernel/intern/image_gen.c | 360 +++++++++++++++++++++++++++
 1 file changed, 360 insertions(+)
 create mode 100644 source/blender/blenkernel/intern/image_gen.c

(limited to 'source/blender/blenkernel/intern/image_gen.c')

diff --git a/source/blender/blenkernel/intern/image_gen.c b/source/blender/blenkernel/intern/image_gen.c
new file mode 100644
index 00000000000..e11ddfd59fa
--- /dev/null
+++ b/source/blender/blenkernel/intern/image_gen.c
@@ -0,0 +1,360 @@
+/*  image_gen.c	
+ * 
+ * $Id: 
+ *
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): Matt Ebb, Campbell Barton, Shuvro Sarker
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#include <math.h>
+#include "BLI_math_color.h"
+#include "BLF_api.h"
+
+void BKE_image_buf_fill_color(unsigned char *rect, float *rect_float, int width, int height, float color[4])
+{
+	int x, y;
+
+	/* blank image */
+	if(rect_float) {
+		for(y= 0; y<height; y++) {
+			for(x= 0; x<width; x++) {
+				rect_float[0]= color[0];
+				rect_float[1]= color[1];
+				rect_float[2]= color[2];
+				rect_float[3]= color[3];
+				rect_float+= 4;
+			}
+		}
+	}
+	
+	if(rect) {
+		char ccol[4];
+
+		ccol[0]= (char)(color[0]*255.0f);
+		ccol[1]= (char)(color[1]*255.0f);
+		ccol[2]= (char)(color[2]*255.0f);
+		ccol[3]= (char)(color[3]*255.0f);
+		for(y= 0; y<height; y++) {
+			for(x= 0; x<width; x++) {
+				
+				rect[0]= ccol[0];
+				rect[1]= ccol[1];
+				rect[2]= ccol[2];
+				rect[3]= ccol[3];
+				rect+= 4;
+			}
+		}
+	}
+}
+
+
+void BKE_image_buf_fill_checker(unsigned char *rect, float *rect_float, int width, int height)
+{
+	/* these two passes could be combined into one, but it's more readable and 
+	* easy to tweak like this, speed isn't really that much of an issue in this situation... */
+ 
+	int checkerwidth= 32, dark= 1;
+	int x, y;
+	
+	float h=0.0, hoffs=0.0, hue=0.0, s=0.9, v=0.9, r, g, b;
+
+	/* checkers */
+	for(y= 0; y<height; y++) {
+		dark= powf(-1.0f, floorf(y / checkerwidth));
+		
+		for(x= 0; x<width; x++) {
+			if (x % checkerwidth == 0) dark= -dark;
+			
+			if (rect_float) {
+				if (dark > 0) {
+					rect_float[0]= rect_float[1]= rect_float[2]= 0.25f;
+					rect_float[3]= 1.0f;
+				} else {
+					rect_float[0]= rect_float[1]= rect_float[2]= 0.58f;
+					rect_float[3]= 1.0f;
+				}
+				rect_float+= 4;
+			}
+			else {
+				if (dark > 0) {
+					rect[0]= rect[1]= rect[2]= 64;
+					rect[3]= 255;
+				} else {
+					rect[0]= rect[1]= rect[2]= 150;
+					rect[3]= 255;
+				}
+				rect+= 4;
+			}
+		}
+	}
+	
+	/* 2nd pass, colored + */
+	for(y= 0; y<height; y++) {
+		hoffs= 0.125f * floorf(y / checkerwidth);
+		
+		for(x= 0; x<width; x++) {
+			h= 0.125f * floorf(x / checkerwidth);
+			
+			if ((fabs((x % checkerwidth) - (checkerwidth / 2)) < 4) &&
+				(fabs((y % checkerwidth) - (checkerwidth / 2)) < 4)) {
+				
+				if ((fabs((x % checkerwidth) - (checkerwidth / 2)) < 1) ||
+					(fabs((y % checkerwidth) - (checkerwidth / 2)) < 1)) {
+					
+					hue= fmodf(fabs(h-hoffs), 1.0f);
+					hsv_to_rgb(hue, s, v, &r, &g, &b);
+					
+					if (rect) {
+						rect[0]= (char)(r * 255.0f);
+						rect[1]= (char)(g * 255.0f);
+						rect[2]= (char)(b * 255.0f);
+						rect[3]= 255;
+					}
+					
+					if (rect_float) {
+						rect_float[0]= r;
+						rect_float[1]= g;
+						rect_float[2]= b;
+						rect_float[3]= 1.0f;
+					}
+				}
+			}
+
+			if (rect_float) rect_float+= 4;
+			if (rect) rect+= 4;
+		}
+	}
+}
+
+
+/* Utility functions for BKE_image_buf_fill_checker_color */
+
+#define BLEND_FLOAT(real, add)  (real+add <= 1.0) ? (real+add) : 1.0
+#define BLEND_CHAR(real, add) ((real + (char)(add * 255.0)) <= 255) ? (real + (char)(add * 255.0)) : 255
+
+static int is_pow2(int n)
+{
+	return ((n)&(n-1))==0;
+}
+static int larger_pow2(int n)
+{
+	if (is_pow2(n))
+		return n;
+
+	while(!is_pow2(n))
+		n= n&(n-1);
+
+	return n*2;
+}
+
+static void checker_board_color_fill(unsigned char *rect, float *rect_float, int width, int height)
+{
+	int hue_step, y, x;
+	float hue, val, sat, r, g, b;
+
+	sat= 1.0;
+
+	hue_step= larger_pow2(width / 8);
+    if(hue_step < 8) hue_step= 8;
+
+	for(y= 0; y < height; y++)
+	{
+        
+        val= 0.1 + (y * (0.4 / height)); /* use a number lower then 1.0 else its too bright */
+		for(x= 0; x < width; x++)
+		{
+			hue= (float)((double)(x/hue_step) * 1.0 / width * hue_step);
+			hsv_to_rgb(hue, sat, val, &r, &g, &b);
+
+			if (rect) {
+				rect[0]= (char)(r * 255.0f);
+				rect[1]= (char)(g * 255.0f);
+				rect[2]= (char)(b * 255.0f);
+				rect[3]= 255;
+				
+				rect += 4;
+			}
+
+			if (rect_float) {
+				rect_float[0]= r;
+				rect_float[1]= g;
+				rect_float[2]= b;
+				rect_float[3]= 1.0f;
+				
+				rect_float += 4;
+			}
+		}
+	}
+}
+
+static void checker_board_color_tint(unsigned char *rect, float *rect_float, int width, int height, int size, float blend)
+{
+	int x, y;
+	float blend_half= blend * 0.5f;
+
+	for(y= 0; y < height; y++)
+	{
+		for(x= 0; x < width; x++)
+		{
+			if( ( (y/size)%2 == 1 && (x/size)%2 == 1 ) || ( (y/size)%2 == 0 && (x/size)%2 == 0 ) )
+			{
+				if (rect) {
+					rect[0]= (char)BLEND_CHAR(rect[0], blend);
+					rect[1]= (char)BLEND_CHAR(rect[1], blend);
+					rect[2]= (char)BLEND_CHAR(rect[2], blend);
+					rect[3]= 255;
+				
+					rect += 4;
+				}
+				if (rect_float) {
+					rect_float[0]= BLEND_FLOAT(rect_float[0], blend);
+					rect_float[1]= BLEND_FLOAT(rect_float[1], blend);
+					rect_float[2]= BLEND_FLOAT(rect_float[2], blend);
+					rect_float[3]= 1.0f;
+				
+					rect_float += 4;
+				}
+			}
+			else {
+				if (rect) {
+					rect[0]= (char)BLEND_CHAR(rect[0], blend_half);
+					rect[1]= (char)BLEND_CHAR(rect[1], blend_half);
+					rect[2]= (char)BLEND_CHAR(rect[2], blend_half);
+					rect[3]= 255;
+				
+					rect += 4;
+				}
+				if (rect_float) {
+					rect_float[0]= BLEND_FLOAT(rect_float[0], blend_half);
+					rect_float[1]= BLEND_FLOAT(rect_float[1], blend_half);
+					rect_float[2]= BLEND_FLOAT(rect_float[2], blend_half);
+					rect_float[3]= 1.0f;
+				
+					rect_float += 4;
+				}
+			}
+			
+		}
+	}	
+}
+
+static void checker_board_grid_fill(unsigned char *rect, float *rect_float, int width, int height, float blend)
+{
+	int x, y;
+	for(y= 0; y < height; y++)
+	{
+		for(x= 0; x < width; x++)
+		{
+			if( ((y % 32) == 0) || ((x % 32) == 0)  || x == 0 )
+			{
+				if (rect) {
+					rect[0]= BLEND_CHAR(rect[0], blend);
+					rect[1]= BLEND_CHAR(rect[1], blend);
+					rect[2]= BLEND_CHAR(rect[2], blend);
+					rect[3]= 255;
+
+					rect += 4;
+				}
+				if (rect_float) {
+					rect_float[0]= BLEND_FLOAT(rect_float[0], blend);
+					rect_float[1]= BLEND_FLOAT(rect_float[1], blend);
+					rect_float[2]= BLEND_FLOAT(rect_float[2], blend);
+					rect_float[3]= 1.0f;
+				
+					rect_float += 4;
+				}
+			}
+			else {
+				if(rect_float) rect_float += 4;
+				if(rect) rect += 4;
+			}
+		}
+	}
+}
+
+/* defined in image.c */
+extern void stamp_font_begin(int size);
+
+static void checker_board_text(unsigned char *rect, float *rect_float, int width, int height, int step, int outline)
+{
+    int x, y;
+    int pen_x, pen_y;
+    char text[3]= {'A', '1', '\0'};
+
+    /* hard coded size! */
+	stamp_font_begin(54);
+    BLF_buffer(rect_float, rect, width, height, 4);
+    
+	for(y= 0; y < height; y+=step)
+	{
+        text[1]= '1';
+        
+		for(x= 0; x < width; x+=step)
+		{
+            /* hard coded offset */
+            pen_x = x + 33;
+            pen_y = y + 44;
+            
+            /* terribly crappy outline font! */
+            BLF_buffer_col(1.0, 1.0, 1.0, 1.0);
+
+            BLF_position(pen_x-outline, pen_y, 0.0);
+            BLF_draw_buffer(text);
+            BLF_position(pen_x+outline, pen_y, 0.0);
+            BLF_draw_buffer(text);
+            BLF_position(pen_x, pen_y-outline, 0.0);
+            BLF_draw_buffer(text);
+            BLF_position(pen_x, pen_y+outline, 0.0);
+            BLF_draw_buffer(text);
+            
+            BLF_position(pen_x-outline, pen_y-outline, 0.0);
+            BLF_draw_buffer(text);
+            BLF_position(pen_x+outline, pen_y+outline, 0.0);
+            BLF_draw_buffer(text);
+            BLF_position(pen_x-outline, pen_y+outline, 0.0);
+            BLF_draw_buffer(text);
+            BLF_position(pen_x+outline, pen_y-outline, 0.0);
+            BLF_draw_buffer(text);
+
+            BLF_buffer_col(0.0, 0.0, 0.0, 1.0);
+            BLF_position(pen_x, pen_y, 0.0);
+            BLF_draw_buffer(text);
+            
+            text[1]++;
+		}
+        text[0]++;
+	}
+    
+    /* cleanup the buffer. */
+	BLF_buffer(0, 0, 0, 0, 0);
+    
+}
+
+void BKE_image_buf_fill_checker_color(unsigned char *rect, float *rect_float, int width, int height)
+{
+	checker_board_color_fill(rect, rect_float, width, height);
+	checker_board_color_tint(rect, rect_float, width, height, 1, 0.03f);
+	checker_board_color_tint(rect, rect_float, width, height, 4, 0.05f);
+	checker_board_color_tint(rect, rect_float, width, height, 32, 0.07f);
+	checker_board_color_tint(rect, rect_float, width, height, 128, 0.15f);
+	checker_board_grid_fill(rect, rect_float, width, height, 1.0f/4.0f);
+
+	checker_board_text(rect, rect_float, width, height, 128, 2);
+}
-- 
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