PolitikerNEU jpg and png support! ( currently linux only ? )

Some little changes where I forgot to integrate the playername Mousescroll is not longer super fast
2025-09-26 07:28:59 +02:00 · 2010-03-23 23:32:25 +00:00
parent f18c73d371
commit ecc39ea911
24 changed files with 1454 additions and 100 deletions
--- a/source/shared_lib/sources/graphics/PNGReader.cpp
+++ b/source/shared_lib/sources/graphics/PNGReader.cpp
@@ -0,0 +1,170 @@
+// ==============================================================
+//	This file is part of Glest Shared Library (www.glest.org)
+//
+//	Copyright (C) 2001-2010 Martiño Figueroa and others
+//
+//	You can redistribute this code 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
+// ==============================================================
+
+#include "PNGReader.h"
+
+#include "types.h"
+#include "pixmap.h"
+#include <stdexcept>
+#include <png.h>
+#include <setjmp.h>
+
+using std::runtime_error;
+using std::ios;
+
+/**Used things from CImageLoaderJPG.cpp from Irrlicht*/
+
+namespace Shared{ namespace Graphics{
+
+// =====================================================
+//	Callbacks for PNG-decompression
+// =====================================================
+
+static void user_read_data(png_structp read_ptr, png_bytep data, png_size_t length) {
+	ifstream& is = *((ifstream*)png_get_io_ptr(read_ptr));
+	is.read((char*)data,length);
+	if (!is.good()) {
+		png_error(read_ptr,"Could not read from png-file");
+	}
+}
+
+static void user_write_data(png_structp png_ptr, png_bytep data, png_size_t length) {
+}
+
+static void user_flush_data(png_structp png_ptr) {}
+
+/**Get Extension array, initialised*/
+static inline const string* getExtensionsPng() {
+	static const string extensions[] = {"png", ""};
+	return extensions;
+}
+
+// =====================================================
+//	class PNGReader
+// =====================================================
+
+PNGReader::PNGReader(): FileReader<Pixmap2D>(getExtensionsPng()) {}
+
+Pixmap2D* PNGReader::read(ifstream& is, const string& path, Pixmap2D* ret) const {
+	//Read file
+	is.seekg(0, ios::end);
+	size_t length = is.tellg();
+	is.seekg(0, ios::beg);
+	uint8 * buffer = new uint8[8];
+	is.read((char*)buffer, 8);
+
+	if (png_sig_cmp(buffer, 0, 8) != 0) {
+		return NULL; //This is not a PNG file - could be used for fast checking whether file is supported or not
+	}
+
+	png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+	if (!png_ptr) {
+		return NULL;
+	}
+	png_infop info_ptr = png_create_info_struct(png_ptr);
+	if (!info_ptr) {
+		return NULL;
+	}
+	if (setjmp(png_jmpbuf(png_ptr))) {
+		return NULL; //Error during init_io
+	}
+	png_set_read_fn(png_ptr, &is, user_read_data); 
+	png_set_sig_bytes(png_ptr, 8);
+	png_read_info(png_ptr, info_ptr);
+	
+	int width = info_ptr->width;
+	int height = info_ptr->height;
+	int color_type = info_ptr->color_type;
+	int bit_depth = info_ptr->bit_depth;
+
+	//We want RGB, 24 bit
+	if (color_type == PNG_COLOR_TYPE_PALETTE || (color_type == PNG_COLOR_TYPE_GRAY && info_ptr->bit_depth < 8) || (info_ptr->valid & PNG_INFO_tRNS)) {
+		png_set_expand(png_ptr);
+	}
+
+	if (color_type == PNG_COLOR_TYPE_GRAY) {
+		png_set_gray_to_rgb(png_ptr);
+	}
+
+	int number_of_passes = png_set_interlace_handling(png_ptr);
+	png_read_update_info(png_ptr, info_ptr);
+	png_bytep* row_pointers = new png_bytep[height];
+
+	if (setjmp(png_jmpbuf(png_ptr))) {
+		delete[] row_pointers;
+		return NULL; //error during read_image
+	}
+	for (int y = 0; y < height; ++y) {
+		row_pointers[y] = new png_byte[info_ptr->rowbytes];
+	}
+	png_read_image(png_ptr, row_pointers);
+	int fileComponents = info_ptr->rowbytes/info_ptr->width;
+	int picComponents = (ret->getComponents()==-1)?fileComponents:ret->getComponents();
+	//Copy image
+	ret->init(width,height,picComponents);
+	uint8* pixels = ret->getPixels();
+	const int rowbytes = info_ptr->rowbytes;
+	int location = 0;
+	for (int y = height-1; y >= 0; --y) { //you have to somehow invert the lines
+		if (picComponents == fileComponents) {
+			memcpy(pixels+location,row_pointers[y],rowbytes);
+		} else {
+			int r,g,b,a,l;
+			for (int xPic = 0, xFile = 0; xFile < rowbytes; xPic+= picComponents, xFile+= fileComponents) {
+				switch(fileComponents) {
+					case 3:
+						r = row_pointers[y][xFile];
+						g = row_pointers[y][xFile+1];
+						b = row_pointers[y][xFile+2];
+						l = (r+g+b+2)/3;
+						a = 255;
+						break;
+					case 4:
+						r = row_pointers[y][xFile];
+						g = row_pointers[y][xFile+1];
+						b = row_pointers[y][xFile+2];
+						l = (r+g+b+2)/3;
+						a = row_pointers[y][xFile+3];	
+						break;
+					default:
+						//TODO: Error
+					case 1:
+						r = g = b = l = row_pointers[y][xFile];
+						a = 255;
+						break;
+				}
+				switch (picComponents) {
+					case 1:
+						pixels[location+xPic] = l;
+						break;
+					case 4:
+						pixels[location+xPic+3] = a; //Next case
+					case 3:
+						pixels[location+xPic] = r;
+						pixels[location+xPic+1] = g;
+						pixels[location+xPic+2] = b;
+						break;
+					default:
+						//just so at least something works
+						for (int i = 0; i < picComponents; ++i) {
+							pixels[location+xPic+i] = l;
+						}
+						//TODO: Error
+				}
+			}
+		}
+		location+=picComponents*width;
+	}
+	delete[] row_pointers;
+	return ret;
+}
+
+}} //end namespace