initial commit

Signed-off-by: Peter Siegmund <mars3142@noreply.mars3142.dev>

libs/wxWidgets-3.3.1/3rdparty/nanosvg/example/drawing.svg

@@ -0,0 +1,97 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="1000"
+   height="1000"
+   id="svg2"
+   version="1.1"
+   inkscape:version="0.48.2 r9819"
+   sodipodi:docname="drawing.svg">
+  <defs
+     id="defs4" />
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="0.35"
+     inkscape:cx="375"
+     inkscape:cy="520"
+     inkscape:document-units="px"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     inkscape:window-width="751"
+     inkscape:window-height="578"
+     inkscape:window-x="0"
+     inkscape:window-y="22"
+     inkscape:window-maximized="0" />
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(0,-52.362183)">
+    <path
+       style="fill:#ff5555;stroke:#000000;stroke-width:10.62107277px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="m 131.73911,422.01626 c 0,146.85769 43.82213,215.39128 201.5818,141.96244 157.75968,-73.42885 188.43518,-107.69564 354.95926,78.32409 166.5241,186.01973 210.34624,244.76282 162.1419,-122.3814 -48.20435,-367.1442 -4.38221,34.26679 -131.46641,-24.47627 C 591.87149,436.70204 732.10231,191.93923 543.66715,187.04398 355.23198,182.14871 574.34264,265.36807 534.90271,368.16845 495.4628,470.96883 355.23198,627.61702 311.40985,475.8641 267.58772,324.11115 193.09009,333.90166 131.73911,422.01626 z"
+       id="path2985"
+       inkscape:connector-curvature="0" />
+    <rect
+       style="fill:#00ffff;stroke:#000000;stroke-width:10.62107277px;"
+       id="rect2987"
+       width="390.01697"
+       height="200.70551"
+       x="228.14781"
+       y="539.50238" />
+    <path
+       sodipodi:type="arc"
+       style="fill:#00ffff"
+       id="path3008"
+       sodipodi:cx="157.14285"
+       sodipodi:cy="168.57143"
+       sodipodi:rx="57.142857"
+       sodipodi:ry="88.571426"
+       d="m 214.28571,168.57143 a 57.142857,88.571426 0 1 1 -114.285714,0 57.142857,88.571426 0 1 1 114.285714,0 z"
+       transform="translate(188.57143,138.07647)" />
+    <rect
+       style="fill:#00ff00"
+       id="rect3010"
+       width="371.42856"
+       height="145.71428"
+       x="261.66104"
+       y="945.44141"
+       transform="matrix(0.948958,-0.31540248,0.31540248,0.948958,0,0)"
+       ry="51.42857" />
+    <path
+       sodipodi:type="arc"
+       style="fill:#00ff00"
+       id="path3038"
+       sodipodi:cx="200"
+       sodipodi:cy="177.14285"
+       sodipodi:rx="54.285713"
+       sodipodi:ry="54.285713"
+       d="m 254.28571,177.14285 a 54.285713,54.285713 0 1 1 -108.57142,0 54.285713,54.285713 0 1 1 108.57142,0 z"
+       transform="translate(0,52.362183)" />
+  </g>
+</svg>

libs/wxWidgets-3.3.1/3rdparty/nanosvg/example/example1.c

@@ -0,0 +1,258 @@
+//
+// Copyright (c) 2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#include <stdio.h>
+#include <string.h>
+#include <float.h>
+#include <GLFW/glfw3.h>
+
+#define NANOSVG_IMPLEMENTATION
+#include "nanosvg.h"
+
+NSVGimage* g_image = NULL;
+
+static unsigned char bgColor[4] = {205,202,200,255};
+static unsigned char lineColor[4] = {0,160,192,255};
+
+static float distPtSeg(float x, float y, float px, float py, float qx, float qy)
+{
+	float pqx, pqy, dx, dy, d, t;
+	pqx = qx-px;
+	pqy = qy-py;
+	dx = x-px;
+	dy = y-py;
+	d = pqx*pqx + pqy*pqy;
+	t = pqx*dx + pqy*dy;
+	if (d > 0) t /= d;
+	if (t < 0) t = 0;
+	else if (t > 1) t = 1;
+	dx = px + t*pqx - x;
+	dy = py + t*pqy - y;
+	return dx*dx + dy*dy;
+}
+
+static void cubicBez(float x1, float y1, float x2, float y2,
+					 float x3, float y3, float x4, float y4,
+					 float tol, int level)
+{
+	float x12,y12,x23,y23,x34,y34,x123,y123,x234,y234,x1234,y1234;
+	float d;
+	
+	if (level > 12) return;
+
+	x12 = (x1+x2)*0.5f;
+	y12 = (y1+y2)*0.5f;
+	x23 = (x2+x3)*0.5f;
+	y23 = (y2+y3)*0.5f;
+	x34 = (x3+x4)*0.5f;
+	y34 = (y3+y4)*0.5f;
+	x123 = (x12+x23)*0.5f;
+	y123 = (y12+y23)*0.5f;
+	x234 = (x23+x34)*0.5f;
+	y234 = (y23+y34)*0.5f;
+	x1234 = (x123+x234)*0.5f;
+	y1234 = (y123+y234)*0.5f;
+
+	d = distPtSeg(x1234, y1234, x1,y1, x4,y4);
+	if (d > tol*tol) {
+		cubicBez(x1,y1, x12,y12, x123,y123, x1234,y1234, tol, level+1); 
+		cubicBez(x1234,y1234, x234,y234, x34,y34, x4,y4, tol, level+1); 
+	} else {
+		glVertex2f(x4, y4);
+	}
+}
+
+void drawPath(float* pts, int npts, char closed, float tol)
+{
+	int i;
+	glBegin(GL_LINE_STRIP);
+	glColor4ubv(lineColor);
+	glVertex2f(pts[0], pts[1]);
+	for (i = 0; i < npts-1; i += 3) {
+		float* p = &pts[i*2];
+		cubicBez(p[0],p[1], p[2],p[3], p[4],p[5], p[6],p[7], tol, 0);
+	}
+	if (closed) {
+		glVertex2f(pts[0], pts[1]);
+	}
+	glEnd();
+}
+
+void drawControlPts(float* pts, int npts)
+{
+	int i;
+
+	// Control lines
+	glColor4ubv(lineColor);
+	glBegin(GL_LINES);
+	for (i = 0; i < npts-1; i += 3) {
+		float* p = &pts[i*2];
+		glVertex2f(p[0],p[1]);
+		glVertex2f(p[2],p[3]);
+		glVertex2f(p[4],p[5]);
+		glVertex2f(p[6],p[7]);
+	}
+	glEnd();
+
+	// Points
+	glPointSize(6.0f);
+	glColor4ubv(lineColor);
+
+	glBegin(GL_POINTS);
+	glVertex2f(pts[0],pts[1]);
+	for (i = 0; i < npts-1; i += 3) {
+		float* p = &pts[i*2];
+		glVertex2f(p[6],p[7]);
+	}
+	glEnd();
+
+	// Points
+	glPointSize(3.0f);
+
+	glBegin(GL_POINTS);
+	glColor4ubv(bgColor);
+	glVertex2f(pts[0],pts[1]);
+	for (i = 0; i < npts-1; i += 3) {
+		float* p = &pts[i*2];
+		glColor4ubv(lineColor);
+		glVertex2f(p[2],p[3]);
+		glVertex2f(p[4],p[5]);
+		glColor4ubv(bgColor);
+		glVertex2f(p[6],p[7]);
+	}
+	glEnd();
+}
+
+void drawframe(GLFWwindow* window)
+{
+	int width = 0, height = 0;
+	float view[4], cx, cy, hw, hh, aspect, px;
+	NSVGshape* shape;
+	NSVGpath* path;
+
+	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
+	glfwGetFramebufferSize(window, &width, &height);
+
+	glViewport(0, 0, width, height);
+	glClearColor(220.0f/255.0f, 220.0f/255.0f, 220.0f/255.0f, 1.0f);
+	glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	glDisable(GL_TEXTURE_2D);
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+
+	// Fit view to bounds
+	cx = g_image->width*0.5f;
+	cy = g_image->height*0.5f;
+	hw = g_image->width*0.5f;
+	hh = g_image->height*0.5f;
+
+	if (width/hw < height/hh) {
+		aspect = (float)height / (float)width;
+		view[0] = cx - hw * 1.2f;
+		view[2] = cx + hw * 1.2f;
+		view[1] = cy - hw * 1.2f * aspect;
+		view[3] = cy + hw * 1.2f * aspect;
+	} else {
+		aspect = (float)width / (float)height;
+		view[0] = cx - hh * 1.2f * aspect;
+		view[2] = cx + hh * 1.2f * aspect;
+		view[1] = cy - hh * 1.2f;
+		view[3] = cy + hh * 1.2f;
+	}
+	// Size of one pixel.
+	px = (view[2] - view[1]) / (float)width;
+
+	glOrtho(view[0], view[2], view[3], view[1], -1, 1);
+
+	glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+	glDisable(GL_DEPTH_TEST);
+	glColor4ub(255,255,255,255);
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
+
+	// Draw bounds
+	glColor4ub(0,0,0,64);
+	glBegin(GL_LINE_LOOP);
+	glVertex2f(0, 0);
+	glVertex2f(g_image->width, 0);
+	glVertex2f(g_image->width, g_image->height);
+	glVertex2f(0, g_image->height);
+	glEnd();
+
+	for (shape = g_image->shapes; shape != NULL; shape = shape->next) {
+		for (path = shape->paths; path != NULL; path = path->next) {
+			drawPath(path->pts, path->npts, path->closed, px * 1.5f);
+			drawControlPts(path->pts, path->npts);
+		}
+	}
+
+	glfwSwapBuffers(window);
+}
+
+void resizecb(GLFWwindow* window, int width, int height)
+{
+	// Update and render
+	NSVG_NOTUSED(width);
+	NSVG_NOTUSED(height);
+	drawframe(window);
+}
+
+int main()
+{
+	GLFWwindow* window;
+	const GLFWvidmode* mode;
+
+	if (!glfwInit())
+		return -1;
+
+	mode = glfwGetVideoMode(glfwGetPrimaryMonitor());
+    window = glfwCreateWindow(mode->width - 40, mode->height - 80, "Nano SVG", NULL, NULL);
+	if (!window)
+	{
+		printf("Could not open window\n");
+		glfwTerminate();
+		return -1;
+	}
+
+	glfwSetFramebufferSizeCallback(window, resizecb);
+	glfwMakeContextCurrent(window);
+	glEnable(GL_POINT_SMOOTH);
+	glEnable(GL_LINE_SMOOTH);
+
+
+	g_image = nsvgParseFromFile("../example/nano.svg", "px", 96.0f);
+	if (g_image == NULL) {
+		printf("Could not open SVG image.\n");
+		glfwTerminate();
+		return -1;
+	}
+
+	while (!glfwWindowShouldClose(window))
+	{
+		drawframe(window);
+		glfwPollEvents();
+	}
+
+	nsvgDelete(g_image);
+
+	glfwTerminate();
+	return 0;
+}

libs/wxWidgets-3.3.1/3rdparty/nanosvg/example/example2.c

@@ -0,0 +1,69 @@
+//
+// Copyright (c) 2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#include <stdio.h>
+#include <string.h>
+#include <float.h>
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include "stb_image_write.h"
+#define NANOSVG_IMPLEMENTATION
+#include "nanosvg.h"
+#define NANOSVGRAST_IMPLEMENTATION
+#include "nanosvgrast.h"
+
+int main()
+{
+	NSVGimage *image = NULL;
+	NSVGrasterizer *rast = NULL;
+	unsigned char* img = NULL;
+	int w, h;
+	const char* filename = "../example/23.svg";
+
+	printf("parsing %s\n", filename);
+	image = nsvgParseFromFile(filename, "px", 96.0f);
+	if (image == NULL) {
+		printf("Could not open SVG image.\n");
+		goto error;
+	}
+	w = (int)image->width;
+	h = (int)image->height;
+
+	rast = nsvgCreateRasterizer();
+	if (rast == NULL) {
+		printf("Could not init rasterizer.\n");
+		goto error;
+	}
+
+	img = malloc(w*h*4);
+	if (img == NULL) {
+		printf("Could not alloc image buffer.\n");
+		goto error;
+	}
+
+	printf("rasterizing image %d x %d\n", w, h);
+	nsvgRasterize(rast, image, 0,0,1, img, w, h, w*4);
+
+	printf("writing svg.png\n");
+ 	stbi_write_png("svg.png", w, h, 4, img, w*4);
+
+error:
+	nsvgDeleteRasterizer(rast);
+	nsvgDelete(image);
+
+	return 0;
+}

libs/wxWidgets-3.3.1/3rdparty/nanosvg/example/nano.svg

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 13.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 14948)  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 width="640px" height="480px" viewBox="0 0 640 480" enable-background="new 0 0 640 480" xml:space="preserve">
+<path d="M282.658,250.271c0,5.31-1.031,10.156-3.087,14.543c-2.059,4.387-4.984,8.152-8.774,11.293
+	c-3.793,3.144-8.477,5.58-14.055,7.312c-5.581,1.731-11.836,2.601-18.767,2.601c-9.968,0-18.605-1.572-25.917-4.713
+	s-13.299-6.986-17.955-11.536l13.812-15.111c4.116,3.684,8.584,6.499,13.405,8.449c4.819,1.95,9.993,2.925,15.518,2.925
+	c5.525,0,9.856-1.219,12.999-3.656c3.141-2.438,4.712-5.769,4.712-9.993c0-2.056-0.3-3.844-0.894-5.361
+	c-0.596-1.517-1.653-2.925-3.168-4.226c-1.518-1.3-3.549-2.519-6.093-3.655c-2.546-1.138-5.768-2.301-9.668-3.494
+	c-6.5-2.056-11.943-4.25-16.33-6.58c-4.387-2.328-7.937-4.9-10.643-7.719c-2.709-2.815-4.659-5.931-5.849-9.343
+	c-1.193-3.412-1.788-7.23-1.788-11.455c0-5.2,1.082-9.831,3.25-13.893c2.166-4.062,5.144-7.5,8.937-10.318
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+	c-2.818,1.896-4.225,4.578-4.225,8.043c0,1.843,0.297,3.412,0.894,4.712c0.594,1.3,1.65,2.519,3.168,3.656
+	c1.516,1.137,3.656,2.249,6.418,3.331c2.763,1.084,6.309,2.33,10.643,3.736c5.306,1.734,10.046,3.631,14.218,5.688
+	c4.169,2.06,7.662,4.524,10.48,7.394c2.815,2.871,4.981,6.174,6.5,9.911C281.898,240.603,282.658,245.071,282.658,250.271z
+	 M335.953,260.833l20.637-90.181h27.46l-32.011,112.604h-33.634l-32.173-112.604h28.598l20.311,90.181H335.953z M437.832,286.019
+	c-16.357,0-28.896-5.01-37.615-15.03c-8.722-10.019-13.081-24.779-13.081-44.278c0-9.531,1.407-17.98,4.225-25.348
+	c2.815-7.366,6.688-13.54,11.618-18.524c4.928-4.981,10.668-8.747,17.223-11.293c6.555-2.544,13.568-3.818,21.043-3.818
+	c8.23,0,15.436,1.3,21.611,3.899c6.174,2.6,11.537,5.959,16.086,10.075l-14.137,14.624c-3.467-3.032-6.906-5.281-10.318-6.744
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+	c-1.355,4.984-2.031,10.996-2.031,18.037c0,7.367,0.486,13.567,1.463,18.604c0.975,5.037,2.408,9.1,4.305,12.187
+	c1.895,3.087,4.307,5.309,7.23,6.662c2.926,1.355,6.338,2.031,10.238,2.031c5.631,0,10.613-1.244,14.947-3.737v-25.186h-14.785
+	l-2.6-18.849h43.547v55.57c-5.85,3.793-12.297,6.718-19.336,8.774C453.051,284.987,445.631,286.019,437.832,286.019z M523.5,151.5
+	c0-6.627-5.373-12-12-12h-343c-6.627,0-12,5.373-12,12v150c0,6.627,5.373,12,12,12h343c6.627,0,12-5.373,12-12V151.5z"/>
+</svg>

libs/wxWidgets-3.3.1/3rdparty/nanosvg/example/stb_image_write.h

@@ -0,0 +1,511 @@
+/* stbiw-0.92 - public domain - http://nothings.org/stb/stb_image_write.h
+   writes out PNG/BMP/TGA images to C stdio - Sean Barrett 2010
+                            no warranty implied; use at your own risk
+
+
+Before including,
+
+    #define STB_IMAGE_WRITE_IMPLEMENTATION
+
+in the file that you want to have the implementation.
+
+
+ABOUT:
+
+   This header file is a library for writing images to C stdio. It could be
+   adapted to write to memory or a general streaming interface; let me know.
+
+   The PNG output is not optimal; it is 20-50% larger than the file
+   written by a decent optimizing implementation. This library is designed
+   for source code compactness and simplicitly, not optimal image file size
+   or run-time performance.
+
+USAGE:
+
+   There are three functions, one for each image file format:
+
+     int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
+     int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
+     int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
+
+   Each function returns 0 on failure and non-0 on success.
+   
+   The functions create an image file defined by the parameters. The image
+   is a rectangle of pixels stored from left-to-right, top-to-bottom.
+   Each pixel contains 'comp' channels of data stored interleaved with 8-bits
+   per channel, in the following order: 1=Y, 2=YA, 3=RGB, 4=RGBA. (Y is
+   monochrome color.) The rectangle is 'w' pixels wide and 'h' pixels tall.
+   The *data pointer points to the first byte of the top-left-most pixel.
+   For PNG, "stride_in_bytes" is the distance in bytes from the first byte of
+   a row of pixels to the first byte of the next row of pixels.
+
+   PNG creates output files with the same number of components as the input.
+   The BMP and TGA formats expand Y to RGB in the file format. BMP does not
+   output alpha.
+   
+   PNG supports writing rectangles of data even when the bytes storing rows of
+   data are not consecutive in memory (e.g. sub-rectangles of a larger image),
+   by supplying the stride between the beginning of adjacent rows. The other
+   formats do not. (Thus you cannot write a native-format BMP through the BMP
+   writer, both because it is in BGR order and because it may have padding
+   at the end of the line.)
+*/
+
+#ifndef INCLUDE_STB_IMAGE_WRITE_H
+#define INCLUDE_STB_IMAGE_WRITE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
+extern int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
+extern int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif//INCLUDE_STB_IMAGE_WRITE_H
+
+#ifdef STB_IMAGE_WRITE_IMPLEMENTATION
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+typedef unsigned int stbiw_uint32;
+typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1];
+
+static void writefv(FILE *f, const char *fmt, va_list v)
+{
+   while (*fmt) {
+      switch (*fmt++) {
+         case ' ': break;
+         case '1': { unsigned char x = (unsigned char) va_arg(v, int); fputc(x,f); break; }
+         case '2': { int x = va_arg(v,int); unsigned char b[2];
+                     b[0] = (unsigned char) x; b[1] = (unsigned char) (x>>8);
+                     fwrite(b,2,1,f); break; }
+         case '4': { stbiw_uint32 x = va_arg(v,int); unsigned char b[4];
+                     b[0]=(unsigned char)x; b[1]=(unsigned char)(x>>8);
+                     b[2]=(unsigned char)(x>>16); b[3]=(unsigned char)(x>>24);
+                     fwrite(b,4,1,f); break; }
+         default:
+            assert(0);
+            return;
+      }
+   }
+}
+
+static void write3(FILE *f, unsigned char a, unsigned char b, unsigned char c)
+{
+   unsigned char arr[3];
+   arr[0] = a, arr[1] = b, arr[2] = c;
+   fwrite(arr, 3, 1, f);
+}
+
+static void write_pixels(FILE *f, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad)
+{
+   unsigned char bg[3] = { 255, 0, 255}, px[3];
+   stbiw_uint32 zero = 0;
+   int i,j,k, j_end;
+
+   if (y <= 0)
+      return;
+
+   if (vdir < 0) 
+      j_end = -1, j = y-1;
+   else
+      j_end =  y, j = 0;
+
+   for (; j != j_end; j += vdir) {
+      for (i=0; i < x; ++i) {
+         unsigned char *d = (unsigned char *) data + (j*x+i)*comp;
+         if (write_alpha < 0)
+            fwrite(&d[comp-1], 1, 1, f);
+         switch (comp) {
+            case 1:
+            case 2: write3(f, d[0],d[0],d[0]);
+                    break;
+            case 4:
+               if (!write_alpha) {
+                  // composite against pink background
+                  for (k=0; k < 3; ++k)
+                     px[k] = bg[k] + ((d[k] - bg[k]) * d[3])/255;
+                  write3(f, px[1-rgb_dir],px[1],px[1+rgb_dir]);
+                  break;
+               }
+               /* FALLTHROUGH */
+            case 3:
+               write3(f, d[1-rgb_dir],d[1],d[1+rgb_dir]);
+               break;
+         }
+         if (write_alpha > 0)
+            fwrite(&d[comp-1], 1, 1, f);
+      }
+      fwrite(&zero,scanline_pad,1,f);
+   }
+}
+
+static int outfile(char const *filename, int rgb_dir, int vdir, int x, int y, int comp, void *data, int alpha, int pad, const char *fmt, ...)
+{
+   FILE *f;
+   if (y < 0 || x < 0) return 0;
+   f = fopen(filename, "wb");
+   if (f) {
+      va_list v;
+      va_start(v, fmt);
+      writefv(f, fmt, v);
+      va_end(v);
+      write_pixels(f,rgb_dir,vdir,x,y,comp,data,alpha,pad);
+      fclose(f);
+   }
+   return f != NULL;
+}
+
+int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data)
+{
+   int pad = (-x*3) & 3;
+   return outfile(filename,-1,-1,x,y,comp,(void *) data,0,pad,
+           "11 4 22 4" "4 44 22 444444",
+           'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40,  // file header
+            40, x,y, 1,24, 0,0,0,0,0,0);             // bitmap header
+}
+
+int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data)
+{
+   int has_alpha = !(comp & 1);
+   return outfile(filename, -1,-1, x, y, comp, (void *) data, has_alpha, 0,
+                  "111 221 2222 11", 0,0,2, 0,0,0, 0,0,x,y, 24+8*has_alpha, 8*has_alpha);
+}
+
+// stretchy buffer; stbi__sbpush() == vector<>::push_back() -- stbi__sbcount() == vector<>::size()
+#define stbi__sbraw(a) ((int *) (a) - 2)
+#define stbi__sbm(a)   stbi__sbraw(a)[0]
+#define stbi__sbn(a)   stbi__sbraw(a)[1]
+
+#define stbi__sbneedgrow(a,n)  ((a)==0 || stbi__sbn(a)+n >= stbi__sbm(a))
+#define stbi__sbmaybegrow(a,n) (stbi__sbneedgrow(a,(n)) ? stbi__sbgrow(a,n) : 0)
+#define stbi__sbgrow(a,n)  stbi__sbgrowf((void **) &(a), (n), sizeof(*(a)))
+
+#define stbi__sbpush(a, v)      (stbi__sbmaybegrow(a,1), (a)[stbi__sbn(a)++] = (v))
+#define stbi__sbcount(a)        ((a) ? stbi__sbn(a) : 0)
+#define stbi__sbfree(a)         ((a) ? free(stbi__sbraw(a)),0 : 0)
+
+static void *stbi__sbgrowf(void **arr, int increment, int itemsize)
+{
+   int m = *arr ? 2*stbi__sbm(*arr)+increment : increment+1;
+   void *p = realloc(*arr ? stbi__sbraw(*arr) : 0, itemsize * m + sizeof(int)*2);
+   assert(p);
+   if (p) {
+      if (!*arr) ((int *) p)[1] = 0;
+      *arr = (void *) ((int *) p + 2);
+      stbi__sbm(*arr) = m;
+   }
+   return *arr;
+}
+
+static unsigned char *stbi__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount)
+{
+   while (*bitcount >= 8) {
+      stbi__sbpush(data, (unsigned char) *bitbuffer);
+      *bitbuffer >>= 8;
+      *bitcount -= 8;
+   }
+   return data;
+}
+
+static int stbi__zlib_bitrev(int code, int codebits)
+{
+   int res=0;
+   while (codebits--) {
+      res = (res << 1) | (code & 1);
+      code >>= 1;
+   }
+   return res;
+}
+
+static unsigned int stbi__zlib_countm(unsigned char *a, unsigned char *b, int limit)
+{
+   int i;
+   for (i=0; i < limit && i < 258; ++i)
+      if (a[i] != b[i]) break;
+   return i;
+}
+
+static unsigned int stbi__zhash(unsigned char *data)
+{
+   stbiw_uint32 hash = data[0] + (data[1] << 8) + (data[2] << 16);
+   hash ^= hash << 3;
+   hash += hash >> 5;
+   hash ^= hash << 4;
+   hash += hash >> 17;
+   hash ^= hash << 25;
+   hash += hash >> 6;
+   return hash;
+}
+
+#define stbi__zlib_flush() (out = stbi__zlib_flushf(out, &bitbuf, &bitcount))
+#define stbi__zlib_add(code,codebits) \
+      (bitbuf |= (code) << bitcount, bitcount += (codebits), stbi__zlib_flush())
+#define stbi__zlib_huffa(b,c)  stbi__zlib_add(stbi__zlib_bitrev(b,c),c)
+// default huffman tables
+#define stbi__zlib_huff1(n)  stbi__zlib_huffa(0x30 + (n), 8)
+#define stbi__zlib_huff2(n)  stbi__zlib_huffa(0x190 + (n)-144, 9)
+#define stbi__zlib_huff3(n)  stbi__zlib_huffa(0 + (n)-256,7)
+#define stbi__zlib_huff4(n)  stbi__zlib_huffa(0xc0 + (n)-280,8)
+#define stbi__zlib_huff(n)  ((n) <= 143 ? stbi__zlib_huff1(n) : (n) <= 255 ? stbi__zlib_huff2(n) : (n) <= 279 ? stbi__zlib_huff3(n) : stbi__zlib_huff4(n))
+#define stbi__zlib_huffb(n) ((n) <= 143 ? stbi__zlib_huff1(n) : stbi__zlib_huff2(n))
+
+#define stbi__ZHASH   16384
+
+unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality)
+{
+   static unsigned short lengthc[] = { 3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258, 259 };
+   static unsigned char  lengtheb[]= { 0,0,0,0,0,0,0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4,  4,  5,  5,  5,  5,  0 };
+   static unsigned short distc[]   = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577, 32768 };
+   static unsigned char  disteb[]  = { 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13 };
+   unsigned int bitbuf=0;
+   int i,j, bitcount=0;
+   unsigned char *out = NULL;
+   unsigned char **hash_table[stbi__ZHASH]; // 64KB on the stack!
+   if (quality < 5) quality = 5;
+
+   stbi__sbpush(out, 0x78);   // DEFLATE 32K window
+   stbi__sbpush(out, 0x5e);   // FLEVEL = 1
+   stbi__zlib_add(1,1);  // BFINAL = 1
+   stbi__zlib_add(1,2);  // BTYPE = 1 -- fixed huffman
+
+   for (i=0; i < stbi__ZHASH; ++i)
+      hash_table[i] = NULL;
+
+   i=0;
+   while (i < data_len-3) {
+      // hash next 3 bytes of data to be compressed 
+      int h = stbi__zhash(data+i)&(stbi__ZHASH-1), best=3;
+      unsigned char *bestloc = 0;
+      unsigned char **hlist = hash_table[h];
+      int n = stbi__sbcount(hlist);
+      for (j=0; j < n; ++j) {
+         if (hlist[j]-data > i-32768) { // if entry lies within window
+            int d = stbi__zlib_countm(hlist[j], data+i, data_len-i);
+            if (d >= best) best=d,bestloc=hlist[j];
+         }
+      }
+      // when hash table entry is too long, delete half the entries
+      if (hash_table[h] && stbi__sbn(hash_table[h]) == 2*quality) {
+         memcpy(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality);
+         stbi__sbn(hash_table[h]) = quality;
+      }
+      stbi__sbpush(hash_table[h],data+i);
+
+      if (bestloc) {
+         // "lazy matching" - check match at *next* byte, and if it's better, do cur byte as literal
+         h = stbi__zhash(data+i+1)&(stbi__ZHASH-1);
+         hlist = hash_table[h];
+         n = stbi__sbcount(hlist);
+         for (j=0; j < n; ++j) {
+            if (hlist[j]-data > i-32767) {
+               int e = stbi__zlib_countm(hlist[j], data+i+1, data_len-i-1);
+               if (e > best) { // if next match is better, bail on current match
+                  bestloc = NULL;
+                  break;
+               }
+            }
+         }
+      }
+
+      if (bestloc) {
+         int d = data+i - bestloc; // distance back
+         assert(d <= 32767 && best <= 258);
+         for (j=0; best > lengthc[j+1]-1; ++j);
+         stbi__zlib_huff(j+257);
+         if (lengtheb[j]) stbi__zlib_add(best - lengthc[j], lengtheb[j]);
+         for (j=0; d > distc[j+1]-1; ++j);
+         stbi__zlib_add(stbi__zlib_bitrev(j,5),5);
+         if (disteb[j]) stbi__zlib_add(d - distc[j], disteb[j]);
+         i += best;
+      } else {
+         stbi__zlib_huffb(data[i]);
+         ++i;
+      }
+   }
+   // write out final bytes
+   for (;i < data_len; ++i)
+      stbi__zlib_huffb(data[i]);
+   stbi__zlib_huff(256); // end of block
+   // pad with 0 bits to byte boundary
+   while (bitcount)
+      stbi__zlib_add(0,1);
+
+   for (i=0; i < stbi__ZHASH; ++i)
+      (void) stbi__sbfree(hash_table[i]);
+
+   {
+      // compute adler32 on input
+      unsigned int i=0, s1=1, s2=0, blocklen = data_len % 5552;
+      int j=0;
+      while (j < data_len) {
+         for (i=0; i < blocklen; ++i) s1 += data[j+i], s2 += s1;
+         s1 %= 65521, s2 %= 65521;
+         j += blocklen;
+         blocklen = 5552;
+      }
+      stbi__sbpush(out, (unsigned char) (s2 >> 8));
+      stbi__sbpush(out, (unsigned char) s2);
+      stbi__sbpush(out, (unsigned char) (s1 >> 8));
+      stbi__sbpush(out, (unsigned char) s1);
+   }
+   *out_len = stbi__sbn(out);
+   // make returned pointer freeable
+   memmove(stbi__sbraw(out), out, *out_len);
+   return (unsigned char *) stbi__sbraw(out);
+}
+
+unsigned int stbi__crc32(unsigned char *buffer, int len)
+{
+   static unsigned int crc_table[256];
+   unsigned int crc = ~0u;
+   int i,j;
+   if (crc_table[1] == 0)
+      for(i=0; i < 256; i++)
+         for (crc_table[i]=i, j=0; j < 8; ++j)
+            crc_table[i] = (crc_table[i] >> 1) ^ (crc_table[i] & 1 ? 0xedb88320 : 0);
+   for (i=0; i < len; ++i)
+      crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)];
+   return ~crc;
+}
+
+#define stbi__wpng4(o,a,b,c,d) ((o)[0]=(unsigned char)(a),(o)[1]=(unsigned char)(b),(o)[2]=(unsigned char)(c),(o)[3]=(unsigned char)(d),(o)+=4)
+#define stbi__wp32(data,v) stbi__wpng4(data, (v)>>24,(v)>>16,(v)>>8,(v));
+#define stbi__wptag(data,s) stbi__wpng4(data, s[0],s[1],s[2],s[3])
+
+static void stbi__wpcrc(unsigned char **data, int len)
+{
+   unsigned int crc = stbi__crc32(*data - len - 4, len+4);
+   stbi__wp32(*data, crc);
+}
+
+static unsigned char stbi__paeth(int a, int b, int c)
+{
+   int p = a + b - c, pa = abs(p-a), pb = abs(p-b), pc = abs(p-c);
+   if (pa <= pb && pa <= pc) return (unsigned char) a;
+   if (pb <= pc) return (unsigned char) b;
+   return (unsigned char) c;
+}
+
+unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len)
+{
+   int ctype[5] = { -1, 0, 4, 2, 6 };
+   unsigned char sig[8] = { 137,80,78,71,13,10,26,10 };
+   unsigned char *out,*o, *filt, *zlib;
+   signed char *line_buffer;
+   int i,j,k,p,zlen;
+
+   if (stride_bytes == 0)
+      stride_bytes = x * n;
+
+   filt = (unsigned char *) malloc((x*n+1) * y); if (!filt) return 0;
+   line_buffer = (signed char *) malloc(x * n); if (!line_buffer) { free(filt); return 0; }
+   for (j=0; j < y; ++j) {
+      static int mapping[] = { 0,1,2,3,4 };
+      static int firstmap[] = { 0,1,0,5,6 };
+      int *mymap = j ? mapping : firstmap;
+      int best = 0, bestval = 0x7fffffff;
+      for (p=0; p < 2; ++p) {
+         for (k= p?best:0; k < 5; ++k) {
+            int type = mymap[k],est=0;
+            unsigned char *z = pixels + stride_bytes*j;
+            for (i=0; i < n; ++i)
+               switch (type) {
+                  case 0: line_buffer[i] = z[i]; break;
+                  case 1: line_buffer[i] = z[i]; break;
+                  case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break;
+                  case 3: line_buffer[i] = z[i] - (z[i-stride_bytes]>>1); break;
+                  case 4: line_buffer[i] = (signed char) (z[i] - stbi__paeth(0,z[i-stride_bytes],0)); break;
+                  case 5: line_buffer[i] = z[i]; break;
+                  case 6: line_buffer[i] = z[i]; break;
+               }
+            for (i=n; i < x*n; ++i) {
+               switch (type) {
+                  case 0: line_buffer[i] = z[i]; break;
+                  case 1: line_buffer[i] = z[i] - z[i-n]; break;
+                  case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break;
+                  case 3: line_buffer[i] = z[i] - ((z[i-n] + z[i-stride_bytes])>>1); break;
+                  case 4: line_buffer[i] = z[i] - stbi__paeth(z[i-n], z[i-stride_bytes], z[i-stride_bytes-n]); break;
+                  case 5: line_buffer[i] = z[i] - (z[i-n]>>1); break;
+                  case 6: line_buffer[i] = z[i] - stbi__paeth(z[i-n], 0,0); break;
+               }
+            }
+            if (p) break;
+            for (i=0; i < x*n; ++i)
+               est += abs((signed char) line_buffer[i]);
+            if (est < bestval) { bestval = est; best = k; }
+         }
+      }
+      // when we get here, best contains the filter type, and line_buffer contains the data
+      filt[j*(x*n+1)] = (unsigned char) best;
+      memcpy(filt+j*(x*n+1)+1, line_buffer, x*n);
+   }
+   free(line_buffer);
+   zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, 8); // increase 8 to get smaller but use more memory
+   free(filt);
+   if (!zlib) return 0;
+
+   // each tag requires 12 bytes of overhead
+   out = (unsigned char *) malloc(8 + 12+13 + 12+zlen + 12); 
+   if (!out) return 0;
+   *out_len = 8 + 12+13 + 12+zlen + 12;
+
+   o=out;
+   memcpy(o,sig,8); o+= 8;
+   stbi__wp32(o, 13); // header length
+   stbi__wptag(o, "IHDR");
+   stbi__wp32(o, x);
+   stbi__wp32(o, y);
+   *o++ = 8;
+   *o++ = (unsigned char) ctype[n];
+   *o++ = 0;
+   *o++ = 0;
+   *o++ = 0;
+   stbi__wpcrc(&o,13);
+
+   stbi__wp32(o, zlen);
+   stbi__wptag(o, "IDAT");
+   memcpy(o, zlib, zlen); o += zlen; free(zlib);
+   stbi__wpcrc(&o, zlen);
+
+   stbi__wp32(o,0);
+   stbi__wptag(o, "IEND");
+   stbi__wpcrc(&o,0);
+
+   assert(o == out + *out_len);
+
+   return out;
+}
+
+int stbi_write_png(char const *filename, int x, int y, int comp, const void *data, int stride_bytes)
+{
+   FILE *f;
+   int len;
+   unsigned char *png = stbi_write_png_to_mem((unsigned char *) data, stride_bytes, x, y, comp, &len);
+   if (!png) return 0;
+   f = fopen(filename, "wb");
+   if (!f) { free(png); return 0; }
+   fwrite(png, 1, len, f);
+   fclose(f);
+   free(png);
+   return 1;
+}
+#endif // STB_IMAGE_WRITE_IMPLEMENTATION
+
+/* Revision history
+
+      0.92 (2010-08-01)
+             casts to unsigned char to fix warnings
+      0.91 (2010-07-17)
+             first public release
+      0.90   first internal release
+*/