comparison trunk/src/Modules/Output/Graphics/Devices/GraphicsOutputDeviceCairo.cc @ 397:7a573750b186

- First add of a lot of graphics code from the old version. Not working yet, not even compiling yet.

+// Copyright 2007, Thomas Walters
+//
+// AIM-C: A C++ implementation of the Auditory Image Model
+// http://www.acousticscale.org/AIMC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/*!
+ * \file
+ * \brief Output device for output to a graphics file using cairo (LGPL)
+ *
+ * \author Tom Walters <[e-mail]> and Willem van Engen <[e-mail]>
+ * \date created 2007/09/17
+ * \version \$Header: $
+ */
+
+#include "Support/Common.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <stdio.h>
+#include <math.h>
+
+#include "Support/util.h"
+#include "Output/GraphicsOutputDeviceCairo.h"
+
+GraphicsOutputDeviceCairo::GraphicsOutputDeviceCairo(Parameters *pParam)
+	: GraphicsOutputDevice(pParam) {
+	m_bOutputFile = false;
+	m_iFileNumber = 0;
+	m_iVertexType = VertexTypeNone;
+	m_bUseMemoryBuffer=false;
+}
+
+bool GraphicsOutputDeviceCairo::Initialize(const char *sDir) {
+  Init();
+
+	//! \todo Output to file if sDir is a file, to directory with
+  //! multiple images if it's a directory.
+	strncpy(m_sDir, sDir, sizeof(m_sDir)/sizeof(m_sDir[0]));
+
+	/* Try to open an image to see if everything is allright. We want to avoid
+	 * errors in the main Process()ing loop. */
+	if ( !OpenFile(0) ) {
+		//! \todo Better error message that is more specific about the cause.
+		AIM_ERROR(_T("Could not open output directory '%s' using graphics format '%s'."),
+			m_sDir, m_pParam->GetString("output.img.format") );
+		return false;
+	}
+	CloseFile();
+
+	return true;
+}
+
+bool GraphicsOutputDeviceCairo::Initialize() {
+    Init();
+    m_bUseMemoryBuffer = true;
+    return(true);
+}
+
+void GraphicsOutputDeviceCairo::Init() {
+ 	AIM_ASSERT(m_pParam);
+	/*
+	 * Set parameters
+	 */
+	m_pParam->GetString("output.img.color.background");
+
+	m_bInvertColors = m_pParam->GetBool("output.img.color.invert");
+
+	// Output size!
+	m_iWidth = m_pParam->GetUInt("output.img.width");
+	m_iHeight = m_pParam->GetUInt("output.img.height");
+}
+
+unsigned char* GraphicsOutputDeviceCairo::GetBuffer() {
+  if(m_bUseMemoryBuffer)
+    return (cairo_image_surface_get_data (m_cSurface));
+  else
+    return NULL;
+}
+
+bool GraphicsOutputDeviceCairo::OpenFile(unsigned int index) {
+  const char *strPlottype = m_pParam->GetString("output.img.format");
+  if (!m_bUseMemoryBuffer) {
+    struct stat fileinfo;
+    // Get filename without trailing slash
+    strncpy(m_sFilename, m_sDir, sizeof(m_sFilename)/sizeof(m_sFilename[0]));
+#ifdef _WINDOWS
+    if (m_sFilename[strlen(m_sFilename)-1]=='\\') {
+      m_sFilename[strlen(m_sFilename)-1]='\0';
+    }
+#else
+    if (m_sFilename[strlen(m_sFilename)-1]=='/') {
+      m_sFilename[strlen(m_sFilename)-1]='\0';
+    }
+#endif
+    // Enumerate files it m_sDir is a directory.
+    if (stat(m_sFilename, &fileinfo) == 0 && (fileinfo.st_mode & S_IFDIR)) {
+      // We have a directory: enumerate with index
+      snprintf(m_sFilename, sizeof(m_sFilename)/sizeof(m_sFilename[0]),"%s%06d.%s",
+               m_sDir,
+               index,
+               strPlottype);
+      // If type is 'auto', fallback to 'png'
+      if (strcmp(strPlottype, "auto")==0)
+        strPlottype = "png";
+    } else {
+      // We have a (probably non-existant) file. Auto-detect type by extension if requested
+      strncpy(m_sFilename, m_sDir, sizeof(m_sFilename)/sizeof(m_sFilename[0]));
+      char *pDot = strrchr(m_sFilename, '.');
+      if (!pDot) {
+        AIM_ERROR(_T("Please supply extension on filename when using 'auto' format: '%s'"),
+                  m_sFilename);
+        return false;
+      }
+      strPlottype = &pDot[1];
+    }
+    m_bOutputFile= true; //! \todo Should check that it's possible to write to the file
+  }
+  // Cairo's RGB24 format has 32-bit pixels with the upper 8 bits unused.
+  // This is not the same as the plotutils PNG format. This information is transferred by the
+  // function GetPixelFormat. The pixel format is dealt with by the reciever.
+  m_cSurface = cairo_image_surface_create (CAIRO_FORMAT_RGB24,
+                                           m_iWidth,
+                                           m_iHeight);
+  m_cCr = cairo_create (m_cSurface);
+  cairo_scale(m_cCr, (float)m_iWidth, (float)m_iHeight);
+	// Now setup things for this plotter.
+	cairo_select_font_face(m_cCr,
+                         m_pParam->GetString("output.img.fontname"),
+                         CAIRO_FONT_SLANT_NORMAL,
+                         CAIRO_FONT_WEIGHT_BOLD);
+  cairo_set_font_size (m_cCr, 0.015);
+	return true;
+}
+
+void GraphicsOutputDeviceCairo::CloseFile() {
+	// Plotting library
+	if (m_iPlotHandle>0) {
+	    cairo_destroy(m_cCr);
+		m_iPlotHandle = 0;
+	}
+	// And the output file
+	if (m_bOutputFile) {
+	  cairo_surface_write_to_png(m_cSurface, m_sFilename);
+		m_bOutputFile = false;
+	}
+	cairo_surface_destroy(m_cSurface);
+}
+
+GraphicsOutputDeviceCairo::~GraphicsOutputDeviceCairo() {
+	AIM_ASSERT(!m_iPlotHandle);
+	CloseFile();
+}
+
+void GraphicsOutputDeviceCairo::gGrab() {
+  // Open file.
+	if (!OpenFile(m_iFileNumber)) {
+		return;
+  }
+	// Setup plotting area.
+	cairo_set_line_width (m_cCr, 0.001f);
+	gColor3f (0.0f, 0.0f, 0.0f);
+  cairo_paint (m_cCr);
+  gColor3f(1.0f, 1.0f, 0.0f);
+}
+
+int GraphicsOutputDeviceCairo::GetPixelFormat() {
+    return AIM_PIX_FMT_RGB24_32;
+}
+
+void GraphicsOutputDeviceCairo::gBeginLineStrip() {
+	m_bIsFirstVertex = true;
+	m_iVertexType = VertexTypeLine;
+	//! \todo Make line width user-settable
+	cairo_set_line_width (m_cCr, 0.001f);
+}
+
+void GraphicsOutputDeviceCairo::gBeginQuadStrip() {
+	m_bIsFirstVertex = true;
+	m_iVertexType = VertexTypeQuad;
+	m_iPrevVertexCount = 0;
+  cairo_set_line_width (m_cCr, 0.001f);
+}
+
+void GraphicsOutputDeviceCairo::gColor3f(float r, float g, float b) {
+  if (m_bInvertColors) {
+		r = 1-r;
+		g = 1-g;
+		b = 1-b;
+	}
+  cairo_set_source_rgb (m_cCr, r, g, b);
+}
+
+void GraphicsOutputDeviceCairo::gVertex3f(float x, float y, float z) {
+	switch(m_iVertexType) {
+	case VertexTypeLine:
+		if (m_bIsFirstVertex) {
+			m_bIsFirstVertex = false;
+			//pl_fmove(x, y);
+			cairo_move_to(m_cCr, x, 1-y);
+		} else {
+			//pl_fcont(x, y);
+			cairo_line_to(m_cCr, x, 1-y);
+		}
+		break;
+	case VertexTypeQuad:
+		/* Store vertices until we got four in a row.
+		 * The order of vertices when processing quads is:
+		 *    1-----3-----5
+		 *    |     |     |
+		 *    0-----2-----4
+		 */
+		if (m_iPrevVertexCount >= 3) {
+			// Plot this quad
+			cairo_move_to(m_cCr, m_aPrevX[0], 1-m_aPrevY[0]);
+			cairo_line_to(m_cCr, m_aPrevX[1], 1-m_aPrevY[1]);
+			cairo_line_to(m_cCr, x, y);
+			cairo_line_to(m_cCr, m_aPrevX[2], 1-m_aPrevY[2]);
+			cairo_close_path (m_cCr);
+
+			// Last vertices of this quad are the first of the next
+			m_aPrevX[0] = m_aPrevX[2];
+			m_aPrevY[0] = m_aPrevY[2];
+			m_aPrevX[1] = x;
+			m_aPrevY[1] = y;
+			m_iPrevVertexCount = 2;
+		} else {
+			// Not at the fourth, keep storing
+			m_aPrevX[m_iPrevVertexCount] = x;
+			m_aPrevY[m_iPrevVertexCount] = y;
+			m_iPrevVertexCount++;
+		}
+		break;
+	default:
+		// Should not happen
+		AIM_ASSERT(0);
+	}
+}
+
+void GraphicsOutputDeviceCairo::gEnd() {
+	if(m_iVertexType==VertexTypeLine)
+    cairo_stroke (m_cCr);
+  else
+    cairo_fill (m_cCr);
+	m_iVertexType = VertexTypeNone;
+}
+
+void GraphicsOutputDeviceCairo::gText3f(float x,
+                                        float y,
+                                        float z,
+                                        const char *sStr,
+                                        bool bRotated) {
+  cairo_text_extents_t te;
+	if (bRotated) {
+	  cairo_rotate(m_cCr, M_PI/2);
+		cairo_move_to(m_cCr, x ,1-y);
+		cairo_show_text(m_cCr, sStr);
+		//cairo_identity_matrix(m_cCr);
+		cairo_rotate(m_cCr, -M_PI/2);
+	} else {
+		cairo_move_to(m_cCr, x ,1-y);
+		cairo_show_text(m_cCr, sStr);
+	}
+}
+
+void GraphicsOutputDeviceCairo::gRelease() {
+	AIM_ASSERT(m_iPlotHandle>0);
+	CloseFile();
+	// Finished this one, up to the next!
+	m_iFileNumber++;
+}