From add301e51ad5ed3338ec1360ee8f1db8b3f648a6 Mon Sep 17 00:00:00 2001
From: skyjake <skyjake@users.sf.net>
Date: Thu, 25 Apr 2013 15:44:48 +0300
Subject: [PATCH] libgui|Image: Added basic image editing methods (using
 QImage)

Clearing the image, filling rects, copying parts of the image.
---
 doomsday/libgui/include/de/gui/image.h | 11 +++++-
 doomsday/libgui/src/image.cpp          | 53 ++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 1 deletion(-)

diff --git a/doomsday/libgui/include/de/gui/image.h b/doomsday/libgui/include/de/gui/image.h
index bb4fa6dac7..354cd7ca50 100644
--- a/doomsday/libgui/include/de/gui/image.h
+++ b/doomsday/libgui/include/de/gui/image.h
@@ -22,6 +22,7 @@
 #include <utility>
 #include <QImage>
 #include <de/Vector>
+#include <de/Rectangle>
 #include <de/ByteRefArray>
 
 #include "libgui.h"
@@ -61,6 +62,7 @@ class LIBGUI_PUBLIC Image
     };
 
     typedef Vector2ui Size;
+    typedef Vector4ub Color;
 
     /// GL format + type for glTex(Sub)Image.
     struct GLFormat {
@@ -91,10 +93,10 @@ class LIBGUI_PUBLIC Image
     Image &operator = (QImage const &other);
 
     Format format() const;
-
     QImage::Format qtFormat() const;
 
     Size size() const;
+    Rectanglei rect() const;
 
     /**
      * Number of bits per pixel.
@@ -133,6 +135,13 @@ class LIBGUI_PUBLIC Image
 
     GLFormat glFormat() const;
 
+    // Drawing/editing methods.
+    Image subImage(Rectanglei const &subArea) const;
+    void resize(Size const &size);
+    void fill(Color const &color);
+    void fill(Rectanglei const &rect, Color const &color);
+    void draw(Image const &image, Vector2i const &topLeft);
+
 public:
     static GLFormat glFormat(Format imageFormat);
     static GLFormat glFormat(QImage::Format qtImageFormat);
diff --git a/doomsday/libgui/src/image.cpp b/doomsday/libgui/src/image.cpp
index 7ed616edf9..050f85cbcd 100644
--- a/doomsday/libgui/src/image.cpp
+++ b/doomsday/libgui/src/image.cpp
@@ -19,8 +19,12 @@
 #include "de/Image"
 #include "de/gui/opengl.h"
 
+#include <QPainter>
+
 namespace de {
 
+#define IMAGE_ASSERT_EDITABLE(d) DENG2_ASSERT(d->format == UseQImageFormat)
+
 DENG2_PIMPL(Image)
 {
     Format format;
@@ -101,6 +105,11 @@ Image::Size Image::size() const
     return d->size;
 }
 
+Rectanglei Image::rect() const
+{
+    return Rectanglei(0, 0, d->size.x, d->size.y);
+}
+
 int Image::depth() const
 {
     switch(d->format)
@@ -266,6 +275,50 @@ Image::GLFormat Image::glFormat() const
     return glFormat(d->format);
 }
 
+Image Image::subImage(Rectanglei const &subArea) const
+{
+    IMAGE_ASSERT_EDITABLE(d);
+
+    return Image(d->image.copy(subArea.topLeft.x, subArea.topLeft.y,
+                               subArea.width(), subArea.height()));
+}
+
+void Image::resize(Size const &size)
+{
+    IMAGE_ASSERT_EDITABLE(d);
+
+    QImage resized(QSize(size.x, size.y), d->image.format());
+    QPainter painter(&resized);
+    painter.drawImage(QPoint(0, 0), d->image);
+    d->image = resized;
+    d->size = size;
+}
+
+void Image::fill(Color const &color)
+{
+    IMAGE_ASSERT_EDITABLE(d);
+
+    d->image.fill(QColor(color.x, color.y, color.z, color.w));
+}
+
+void Image::fill(Rectanglei const &rect, Color const &color)
+{
+    IMAGE_ASSERT_EDITABLE(d);
+
+    QPainter painter(&d->image);
+    painter.fillRect(QRect(rect.topLeft.x, rect.topLeft.y, rect.width(), rect.height()),
+                     QColor(color.x, color.y, color.z, color.w));
+}
+
+void Image::draw(Image const &image, Vector2i const &topLeft)
+{
+    IMAGE_ASSERT_EDITABLE(d);
+    IMAGE_ASSERT_EDITABLE(image.d);
+
+    QPainter painter(&d->image);
+    painter.drawImage(QPoint(topLeft.x, topLeft.y), image.d->image);
+}
+
 Image::GLFormat Image::glFormat(Format imageFormat)
 {
     DENG2_ASSERT(imageFormat >= Luminance_8 && imageFormat <= RGBx_8888);