Changed alpha mask scaling to use Lanczos.

[platform/core/uifw/dali-adaptor.git] / platform-abstractions / portable / image-operations.h

diff --git a/platform-abstractions/portable/image-operations.h b/platform-abstractions/portable/image-operations.h
index 6d76cfe..3b2ac9d 100644 (file)
--- a/platform-abstractions/portable/image-operations.h
+++ b/platform-abstractions/portable/image-operations.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2017 Samsung Electronics Co., Ltd.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -51,6 +51,16 @@ enum BoxDimensionTest
 typedef Uint16Pair ImageDimensions;
 
 /**
+ * @brief Work out the true desired width and height, accounting for special
+ * rules for zeros in either or both input requested dimensions.
+ *
+ * @param[in] rawDimensions Width and height of image before processing.
+ * @param[in] requestedDimensions Width and height of area to scale image into. Can be zero.
+ * @return Dimensions of area to scale image into after special rules are applied.
+ */
+ImageDimensions CalculateDesiredDimensions( ImageDimensions rawDimensions, ImageDimensions requestedDimensions );
+
+/**
  * @defgroup BitmapOperations Bitmap-to-Bitmap Image operations.
  * @{
  */
@@ -307,7 +317,7 @@ void LinearSample3BPP( const unsigned char * __restrict__ inPixels,
 /**
  * @copydoc LinearSample
  *
- * Specialised for four byte per pixel formats like RGBA888.
+ * Specialised for four byte per pixel formats like RGBA8888.
  * @note, If used on RGBA8888, the A component will be blended independently.
  */
 void LinearSample4BPP( const unsigned char * __restrict__ inPixels,
@@ -315,6 +325,38 @@ void LinearSample4BPP( const unsigned char * __restrict__ inPixels,
                        unsigned char * __restrict__ outPixels,
                        ImageDimensions desiredDimensions );
 
+/**
+ * @brief Resamples the input image with the Lanczos algorithm.
+ *
+ * @pre @p inPixels must not alias @p outPixels. The input image should be a totally
+ * separate buffer from the output buffer.
+ *
+ * @param[in] inPixels Pointer to the input image buffer.
+ * @param[in] inputDimensions The input dimensions of the image.
+ * @param[out] outPixels Pointer to the output image buffer.
+ * @param[in] desiredDimensions The output dimensions of the image.
+ */
+void LanczosSample4BPP( const unsigned char * __restrict__ inPixels,
+                        ImageDimensions inputDimensions,
+                        unsigned char * __restrict__ outPixels,
+                        ImageDimensions desiredDimensions );
+
+/**
+ * @brief Resamples the input image with the Lanczos algorithm.
+ *
+ * @pre @p inPixels must not alias @p outPixels. The input image should be a totally
+ * separate buffer from the output buffer.
+ *
+ * @param[in] inPixels Pointer to the input image buffer.
+ * @param[in] inputDimensions The input dimensions of the image.
+ * @param[out] outPixels Pointer to the output image buffer.
+ * @param[in] desiredDimensions The output dimensions of the image.
+ */
+void LanczosSample1BPP( const unsigned char * __restrict__ inPixels,
+                        ImageDimensions inputDimensions,
+                        unsigned char * __restrict__ outPixels,
+                        ImageDimensions desiredDimensions );
+
 /**@}*/
 
 /**