From 52398312caaba3e1bc0613016d5bf3507d1e242a Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jos=C3=A9=20Fonseca?= <jfonseca@vmware.com>
Date: Wed, 11 Sep 2013 18:42:07 +0100
Subject: [PATCH] gui: load image data via the Image class.

A bit hackish.

A stepping stone to store images with Image class instead of QImage.
---
 gui/apisurface.cpp | 84 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 83 insertions(+), 1 deletion(-)

diff --git a/gui/apisurface.cpp b/gui/apisurface.cpp
index d17560f..d6bc72c 100644
--- a/gui/apisurface.cpp
+++ b/gui/apisurface.cpp
@@ -1,9 +1,14 @@
 #include "apisurface.h"
 #include "thumbnail.h"
 
+#include <sstream>
+
 #include <QDebug>
 #include <QSysInfo>
 
+#include "image/image.hpp"
+
+
 ApiSurface::ApiSurface()
 {
 }
@@ -18,10 +23,87 @@ void ApiSurface::setSize(const QSize &size)
     m_size = size;
 }
 
+struct ByteArrayBuf : public std::streambuf
+{
+    ByteArrayBuf(QByteArray & a)
+    {
+        setg(a.data(), a.data(), a.data() + a.size());
+    }
+};
+
 void ApiSurface::contentsFromBase64(const QByteArray &base64)
 {
     QByteArray dataArray = QByteArray::fromBase64(base64);
-    m_image.loadFromData(dataArray, "png");
+
+    /*
+     * FIXME: Detect the float PFM images here.
+     */
+    ByteArrayBuf buf(dataArray);
+    std::istream istr(&buf);
+    image::Image *image = image::readPNG(istr);
+
+    /*
+     * FIXME: Instead of converting to QImage here, we should be deferring the conversion
+     * to imageviewer.cpp.
+     *
+     * XXX: We still need the thumbnail though.
+     */
+
+    Q_ASSERT(image);
+
+    int width = image->width;
+    int height = image->height;
+
+    m_image = QImage(width, height, QImage::Format_ARGB32);
+
+    const unsigned char *srcRow = image->start();
+    for (int y = 0; y < height; ++y) {
+        QRgb *dst = (QRgb *)m_image.scanLine(y);
+
+        if (image->channelType == image::TYPE_UNORM8) {
+            const unsigned char *src = srcRow;
+            for (int x = 0; x < width; ++x) {
+                unsigned char rgba[4];
+                for (int c = 0; c < image->channels; ++c) {
+                    rgba[c] = *src++;
+                }
+                if (image->channels == 1) {
+                    // Use gray-scale instead of red
+                    rgba[1] = rgba[0];
+                    rgba[2] = rgba[0];
+                }
+                dst[x] = qRgba(rgba[0], rgba[1], rgba[2], rgba[3]);
+            }
+        } else {
+            const float *src = (const float *)srcRow;
+            for (int x = 0; x < width; ++x) {
+                unsigned char rgba[4] = {0, 0, 0, 0xff};
+                for (int c = 0; c < image->channels; ++c) {
+                    float f = *src++;
+                    unsigned char u;
+                    if (f >= 255.0f) {
+                        u = 255;
+                    } else if (f <= 0.0f) {
+                        u = 0;
+                    } else {
+                        u = f * 255 + 0.5;
+                    }
+                    rgba[c] = u;
+                }
+                if (image->channels == 1) {
+                    // Use gray-scale instead of red
+                    rgba[1] = rgba[0];
+                    rgba[2] = rgba[0];
+                }
+                dst[x] = qRgba(rgba[0], rgba[1], rgba[2], rgba[3]);
+            }
+        }
+
+        srcRow += image->stride();
+    }
+
+    delete image;
+
     m_thumb = thumbnail(m_image);
 }
 
-- 
2.43.0