Fixed jpg. Added a basic image for testing colors

ImageStreams.xcodeproj/project.pbxproj

@@ -10,6 +10,7 @@
 		4263431015FA676F00977AF9 /* main.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4263430F15FA676F00977AF9 /* main.cpp */; };
 		4263431215FA676F00977AF9 /* ImageStreams.1 in CopyFiles */ = {isa = PBXBuildFile; fileRef = 4263431115FA676F00977AF9 /* ImageStreams.1 */; };
 		4263431C15FA6A3200977AF9 /* libpng.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 4263431B15FA6A3200977AF9 /* libpng.framework */; };
+		4263431F1604CA3900977AF9 /* libjpeg.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 4263431E1604CA3900977AF9 /* libjpeg.a */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -34,6 +35,7 @@
 		4263431A15FA686300977AF9 /* basics.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = basics.hpp; sourceTree = "<group>"; };
 		4263431B15FA6A3200977AF9 /* libpng.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = libpng.framework; path = Library/Frameworks/libpng.framework; sourceTree = SDKROOT; };
 		4263431D1604A79F00977AF9 /* jpg.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = jpg.hpp; sourceTree = "<group>"; };
+		4263431E1604CA3900977AF9 /* libjpeg.a */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; name = libjpeg.a; path = ../../../../../usr/local/lib/libjpeg.a; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -42,6 +44,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				4263431C15FA6A3200977AF9 /* libpng.framework in Frameworks */,
+				4263431F1604CA3900977AF9 /* libjpeg.a in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -51,6 +54,7 @@
 		4263430015FA676F00977AF9 = {
 			isa = PBXGroup;
 			children = (
+				4263431E1604CA3900977AF9 /* libjpeg.a */,
 				4263431B15FA6A3200977AF9 /* libpng.framework */,
 				4263430E15FA676F00977AF9 /* ImageStreams */,
 				4263430C15FA676F00977AF9 /* Products */,

ImageStreams/jpg.hpp

@@ -21,6 +21,15 @@
  */
 
 namespace jpg{
+	template <typename P>
+	J_COLOR_SPACE color_space(){
+		int num_colors = pixel_formats::traits<P>::num_colors;
+		switch (num_colors) {
+			case 1: return JCS_GRAYSCALE;
+			case 3: return JCS_RGB;
+			default: return JCS_UNKNOWN;
+		}
+	}
 	
 	template <typename P = pixel_formats::rgb>
 	struct ostream{
@@ -47,10 +56,10 @@ namespace jpg{
 			cinfo.image_width      = width;
 			cinfo.image_height     = height;
 			cinfo.input_components = pixel_formats::traits<pixel>::num_colors;
-			//cinfo.in_color_space   = JCS_RGB;	// or JCS_GRAYSCALE, will be set in jpeg_set_defaults()
+			cinfo.in_color_space   = color_space<pixel>();
 			
 			jpeg_set_defaults(&cinfo);
-			//jpeg_set_quality(&cinfo, 75, true);	// quality in [0, 100], boolean indicates "force_baseline" (only matters when quality < 25)
+			jpeg_set_quality(&cinfo, 95, true);	// quality in [0, 100], boolean indicates "force_baseline" (only matters when quality < 25)
 			jpeg_start_compress(&cinfo, true);	// true means we will write completely
 		}
 		
@@ -65,7 +74,8 @@ namespace jpg{
 			++x;
 			if(x >= row.size()){
 				// this will return the number of scanlines written
-				jpeg_write_scanlines(&cinfo, reinterpret_cast<unsigned char const*>(row.data()), 1);
+				unsigned char * ptr = reinterpret_cast<unsigned char *>(row.data());
+				jpeg_write_scanlines(&cinfo, &ptr, 1);
 				x = 0;
 			}
 			

ImageStreams/main.cpp

@@ -10,12 +10,21 @@
 
 #include "png.hpp"
 #include "bmp.hpp"
+#include "jpg.hpp"
 #include "basics.hpp"
 
 #include <cmath>
 #include <vector>
+#include <array>
 #include <algorithm>
 
+template <typename ImageType>
+void basic_colors(std::string filename) {
+	ImageType image(8, 1, filename);
+	std::array<double, 2> v = {0.0, 1.0};
+	for(auto b : v) for(auto g : v) for(auto r : v) image << typename ImageType::pixel(r,g,b);
+}
+
 template <typename ImageType>
 void xor_color(std::string filename){
 	size_t size = 512;
@@ -142,25 +151,22 @@ void mandelbrot(std::string filename) {
 }
 
 int main(int argc, const char * argv[]){
-	xor_color<png::colored_ostream>("xor_color.png");
-	xor_color<bmp::colored_ostream>("xor_color.bmp");
-	
-	xor_grad<png::gray_ostream>("xor_grad.png");
-	xor_grad<bmp::gray_ostream>("xor_grad.bmp");
-	
-	noise<png::gray_ostream>("noise.png");
-	noise<bmp::gray_ostream>("noise.bmp");
-	
-	automata<png::gray_ostream>("automata.png");
-	automata<bmp::gray_ostream>("automata.bmp");
-	
-	logistic<png::colored_ostream>("logistic.png");
-	logistic<bmp::colored_ostream>("logistic.bmp");
+	#define test(fun, kind) \
+	std::cout << "Testing " #fun << std::endl; \
+	fun<png::kind ## _ostream>(#fun ".png"); \
+	fun<bmp::kind ## _ostream>(#fun ".bmp"); \
+	fun<jpg::kind ## _ostream>(#fun ".jpg")
+
+	test(basic_colors, colored);
+	test(xor_color, colored);
+	test(logistic, colored);
+	test(logistic2, colored);
 	
-	logistic2<png::colored_ostream>("logistic2.png");
-	logistic2<bmp::colored_ostream>("logistic2.bmp");
+	test(noise, gray);
+	test(xor_grad, gray);
+	test(automata, gray);
+	test(mandelbrot, gray);
 	
-	mandelbrot<png::gray_ostream>("mandelbrot.png");
-	mandelbrot<bmp::gray_ostream>("mandelbrot.bmp");
+	#undef test
 }