ppapi/c/dev/ppb_graphics_2d_dev.h

   1 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2  * Use of this source code is governed by a BSD-style license that can be
   3  * found in the LICENSE file.
   4  */
   5
   6 /* From dev/ppb_graphics_2d_dev.idl modified Tue Jun 19 14:11:08 2012. */
   7
   8 #ifndef PPAPI_C_DEV_PPB_GRAPHICS_2D_DEV_H_
   9 #define PPAPI_C_DEV_PPB_GRAPHICS_2D_DEV_H_
  10
  11 #include "ppapi/c/pp_bool.h"
  12 #include "ppapi/c/pp_macros.h"
  13 #include "ppapi/c/pp_resource.h"
  14 #include "ppapi/c/pp_stdint.h"
  15
  16 #define PPB_GRAPHICS2D_DEV_INTERFACE_0_1 "PPB_Graphics2D(Dev);0.1"
  17 #define PPB_GRAPHICS2D_DEV_INTERFACE PPB_GRAPHICS2D_DEV_INTERFACE_0_1
  18
  19 /**
  20  * @file
  21  * This file contains the <code>PPB_Graphics2D_Dev</code> interface. */
  22
  23
  24 /**
  25  * @addtogroup Interfaces
  26  * @{
  27  */
  28 /* PPB_Graphics2D_Dev interface */
  29 struct PPB_Graphics2D_Dev_0_1 {
  30   /**
  31    * SetScale() sets the scale factor that will be applied when painting the
  32    * graphics context onto the output device. Typically, if rendering at device
  33    * resolution is desired, the context would be created with the width and
  34    * height scaled up by the view's GetDeviceScale and SetScale called with a
  35    * scale of 1.0 / GetDeviceScale(). For example, if the view resource passed
  36    * to DidChangeView has a rectangle of (w=200, h=100) and a device scale of
  37    * 2.0, one would call Create with a size of (w=400, h=200) and then call
  38    * SetScale with 0.5. One would then treat each pixel in the context as a
  39    * single device pixel.
  40    *
  41    * @param[in] resource A <code>Graphics2D</code> context resource.
  42    * @param[in] scale The scale to apply when painting.
  43    *
  44    * @return Returns <code>PP_TRUE</code> on success or <code>PP_FALSE</code> if
  45    * the resource is invalid or the scale factor is 0 or less.
  46    */
  47   PP_Bool (*SetScale)(PP_Resource resource, float scale);
  48   /***
  49    * GetScale() gets the scale factor that will be applied when painting the
  50    * graphics context onto the output device.
  51    *
  52    * @param[in] resource A <code>Graphics2D</code> context resource.
  53    *
  54    * @return Returns the scale factor for the graphics context. If the resource
  55    * is not a valid <code>Graphics2D</code> context, this will return 0.0.
  56    */
  57   float (*GetScale)(PP_Resource resource);
  58 };
  59
  60 typedef struct PPB_Graphics2D_Dev_0_1 PPB_Graphics2D_Dev;
  61 /**
  62  * @}
  63  */
  64
  65 #endif  /* PPAPI_C_DEV_PPB_GRAPHICS_2D_DEV_H_ */
  66