From 01ad965dc3b016dd1953d15208a7763c918f129f Mon Sep 17 00:00:00 2001
From: Artem Pavlenko <artem@mapnik.org>
Date: Mon, 28 Feb 2005 21:03:55 +0000
Subject: [PATCH] added basic jpeg write support todo: 1. check for libjpeg
 properly in configure.ac (at the moment it is part of TIFF check) 2. move all
 image writing stuff to the image_writer_factory

---
 src/image_util.cc | 50 +++++++++++++++++++++++++++++++++++++++++++++--
 src/image_util.hh |  1 +
 2 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/src/image_util.cc b/src/image_util.cc
index 0f95b4ec8..9ff723ed0 100644
--- a/src/image_util.cc
+++ b/src/image_util.cc
@@ -20,6 +20,7 @@
 
 #include <string>
 #include <png.h>
+#include <jpeglib.h>
 #include "graphics.hh"
 #include "image_util.hh"
 #include "memory.hh"
@@ -39,10 +40,15 @@ namespace mapnik
     //
     void ImageUtils::save_to_file(const std::string& filename,const std::string& type,const Image32& image)
     {
+	//all that should go into image_writer factory
         if (type=="png")
         {
             save_as_png(filename,image);
-        }
+        } 
+	else if (type=="jpeg")
+	{
+	    save_as_jpeg(filename,85,image);
+	}
     }
 
     void ImageUtils::save_as_png(const std::string& filename,const Image32& image)
@@ -55,7 +61,6 @@ namespace mapnik
 	
         if (!png_ptr) return;
         png_set_mem_fn(png_ptr,mem_ptr,malloc_fn,free_fn);
-        //png_set_bgr(png_ptr);
 
         // switch on optimization
 #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
@@ -98,4 +103,45 @@ namespace mapnik
         fclose(fp);
     }
 
+    void ImageUtils::save_as_jpeg(const std::string& filename,int quality, const Image32& image)
+    {
+	FILE *fp=fopen(filename.c_str(), "wb");
+        if (!fp) return;
+	struct jpeg_compress_struct cinfo;
+	struct jpeg_error_mgr jerr;
+
+	int width=image.width();
+	int height=image.height();
+	
+	cinfo.err = jpeg_std_error(&jerr);
+	jpeg_create_compress(&cinfo);
+	jpeg_stdio_dest(&cinfo, fp);
+	cinfo.image_width = width;
+	cinfo.image_height = height;
+	cinfo.input_components = 3;
+	cinfo.in_color_space = JCS_RGB; 
+	jpeg_set_defaults(&cinfo);
+	jpeg_set_quality(&cinfo, quality,1);
+	jpeg_start_compress(&cinfo, 1);
+	JSAMPROW row_pointer[1];
+	JSAMPLE* row=new JSAMPLE[width*3];
+	const ImageData32& imageData=image.data();
+	while (cinfo.next_scanline < cinfo.image_height) 
+	{
+	    const unsigned* imageRow=imageData.getRow(cinfo.next_scanline);
+	    int index=0;
+	    for (int i=0;i<width;++i)
+	    {
+		row[index++]=(imageRow[i])&0xff;
+		row[index++]=(imageRow[i]>>8)&0xff;
+		row[index++]=(imageRow[i]>>16)&0xff;
+	    }
+	    row_pointer[0] = &row[0];
+	    (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
+	}
+	delete [] row;
+	jpeg_finish_compress(&cinfo);
+	fclose(fp);
+	jpeg_destroy_compress(&cinfo);
+    }
 }
diff --git a/src/image_util.hh b/src/image_util.hh
index 2712b8491..ed7d78484 100644
--- a/src/image_util.hh
+++ b/src/image_util.hh
@@ -29,6 +29,7 @@ namespace mapnik
 	static void save_to_file(const std::string& filename,const std::string& type,const Image32& image);
     private:
 	static void save_as_png(const std::string& filename,const Image32& image);
+	static void save_as_jpeg(const std::string& filename,int quality, const Image32& image);
     };
 
     template <typename T>