Added functions to draw images at sub-pixel positions

This can be used for smoother mouse cursor movement when rendering our
own mouse cursor (already changed in this commit) and is also necessary
for implementing support for HiDPI font rendering.

Also dropped some almost duplicated OpenGL code.

1 files changed, 29 insertions, 0 deletions

diff --git a/src/graphics.h b/src/graphics.h
index 91bb01cf..79513e2c 100644
--- a/src/graphics.h
+++ b/src/graphics.h
@@ -96,6 +96,14 @@ class Graphics : public gcn::Graphics
         bool drawImage(Image *image, int x, int y);
 
         /**
+         * Blits an image onto the screen.
+         *
+         * @return <code>true</code> if the image was blitted properly
+         *         <code>false</code> otherwise.
+         */
+        bool drawImageF(Image *image, float x, float y);
+
+        /**
          * Draws a rescaled version of the image.
          */
         virtual bool drawRescaledImage(Image *image, int srcX, int srcY,
@@ -105,6 +113,15 @@ class Graphics : public gcn::Graphics
                                        bool useColor = false) = 0;
 
         /**
+         * Draws a rescaled version of the image.
+         */
+        virtual bool drawRescaledImageF(Image *image, int srcX, int srcY,
+                                        float dstX, float dstY,
+                                        int width, int height,
+                                        float desiredWidth, float desiredHeight,
+                                        bool useColor = false);
+
+        /**
          * Blits an image onto the screen.
          *
          * @return <code>true</code> if the image was blitted properly
@@ -116,6 +133,18 @@ class Graphics : public gcn::Graphics
                                int width, int height,
                                bool useColor = false);
 
+        /**
+         * Blits an image onto the screen.
+         *
+         * @return <code>true</code> if the image was blitted properly
+         *         <code>false</code> otherwise.
+         */
+        virtual bool drawImageF(Image *image,
+                                int srcX, int srcY,
+                                float dstX, float dstY,
+                                int width, int height,
+                                bool useColor = false);
+
         virtual void drawImagePattern(Image *image,
                                       int x, int y,
                                       int w, int h);