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nuttx-bb/NxWidgets/libnxwidgets/src/crlepalettebitmap.cxx

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/****************************************************************************
* NxWidgets/libnxwidgets/src/crlepalettebitmap.hxx
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX, NxWidgets, nor the names of its contributors
* me be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************
*
* Portions of this package derive from Woopsi (http://woopsi.org/) and
* portions are original efforts. It is difficult to determine at this
* point what parts are original efforts and which parts derive from Woopsi.
* However, in any event, the work of Antony Dzeryn will be acknowledged
* in most NxWidget files. Thanks Antony!
*
* Copyright (c) 2007-2011, Antony Dzeryn
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the names "Woopsi", "Simian Zombie" nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Antony Dzeryn ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Antony Dzeryn BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <cstring>
#include <nuttx/nx/nxglib.h>
#include "nxconfig.hxx"
#include "crlepalettebitmap.hxx"
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Method Implementations
****************************************************************************/
using namespace NXWidgets;
/**
* Constructor.
*
* @param bitmap The bitmap structure being wrapped.
*/
CRlePaletteBitmap::CRlePaletteBitmap(const struct SRlePaletteBitmap *bitmap)
{
m_bitmap = bitmap;
m_lut = bitmap->lut[0];
startOfImage();
}
/**
* Get the bitmap's color format.
*
* @return The bitmap's width.
*/
const uint8_t CRlePaletteBitmap::getColorFormat(void) const
{
return m_bitmap->fmt;
}
/**
* Get the bitmap's color format.
*
* @return The bitmap's color format.
*/
const uint8_t CRlePaletteBitmap::getBitsPerPixel(void) const
{
return m_bitmap->bpp;
}
/**
* Get the bitmap's width (in pixels/columns).
*
* @return The bitmap's pixel depth.
*/
const nxgl_coord_t CRlePaletteBitmap::getWidth(void) const
{
return m_bitmap->width;
}
/**
* Get the bitmap's height (in rows).
*
* @return The bitmap's height.
*/
const nxgl_coord_t CRlePaletteBitmap::getHeight(void) const
{
return m_bitmap->height;
}
/**
* Get the bitmap's width (in bytes).
*
* @return The bitmap's width.
*/
const nxgl_coord_t CRlePaletteBitmap::getStride(void) const
{
// This only works if the bpp is an even multiple of 8-bit bytes
return (m_bitmap->width * m_bitmap->bpp) >> 3;
}
/**
* Use the colors associated with a selected image.
*
* @param selected. true: Use colors for a selected widget,
* false: Use normal (default) colors.
*/
void CRlePaletteBitmap::setSelected(bool selected)
{
m_lut = m_bitmap->lut[selected ? 1 : 0];
}
/**
* Get one row from the bit map image using the selected LUT.
*
* @param x The offset into the row to get
* @param y The row number to get
* @param width The number of pixels to get from the row
* @param data The memory location provided by the caller
* in which to return the data. This should be at least
* (getWidth()*getBitsPerPixl() + 7)/8 bytes in length
* and properly aligned for the pixel color format.
* @param True if the run was returned successfully.
*/
bool CRlePaletteBitmap::getRun(nxgl_coord_t x, nxgl_coord_t y, nxgl_coord_t width,
FAR void *data)
{
// Check ranges. Casts to unsigned int are ugly but permit one-sided comparisons
if (((unsigned int)x < (unsigned int)width) &&
((unsigned int)(x + width) <= (unsigned int)m_bitmap->width))
{
// Seek to the requested row
if (!seekRow(y))
{
return false;
}
// Offset to the starting X position
if (x > 0)
{
if (!skipPixels(x))
{
return false;
}
}
// Then copy the requested number of pixels
return copyPixels(width, data);
}
return false;
}
/**
* Reset to the beginning of the image
*/
void CRlePaletteBitmap::startOfImage(void)
{
m_row = 0;
m_col = 0;
m_rle = &m_bitmap->data[0];
m_remaining = m_rle->npixels;
}
/**
* Advance position data ahead. Called after npixels have
* have been consume.
*
* @param npixels The number of pixels to advance
* @return False if this goes beyond the end of the image
*/
bool CRlePaletteBitmap::advancePosition(nxgl_coord_t npixels)
{
int newcol = m_col + npixels;
while (newcol >= m_bitmap->width)
{
newcol -= m_bitmap->width;
if (++m_row >= m_bitmap->height)
{
return false;
}
}
m_col = newcol;
return true;
}
/**
* Seek ahead the specific number of pixels -- discarding
* and advancing.
*
* @param npixels The number of pixels to skip
*/
bool CRlePaletteBitmap::skipPixels(nxgl_coord_t npixels)
{
do
{
// Skip values in the current RLE entry
if (m_remaining > npixels)
{
// Subtract from the number of pixels remaining
m_remaining -= npixels;
return advancePosition(npixels);
}
// Not enough (or just enough) in the current entry. Take what we
// can from the current entry and move to the next entry
npixels -= m_remaining;
if (!advancePosition(m_remaining))
{
return false;
}
m_rle++;
m_remaining = m_rle->npixels;
}
while (npixels > 0);
return true;
}
/** Seek to the beginning of the next row
*
* @return False if this was the last row of the image
*/
bool CRlePaletteBitmap::nextRow(void)
{
return skipPixels(m_bitmap->width - m_col);
}
/** Seek to the beignning specific row
*
* @param row The row number to seek to
* @return False if this goes beyond the end of the image
*/
bool CRlePaletteBitmap::seekRow(nxgl_coord_t row)
{
// Is the current position already past the requested position?
if (row < m_row || (row == m_row && m_col != 0))
{
// Yes.. rewind to the beginning of the image
startOfImage();
}
// Seek ahead, row-by-row until we are at the beginning of
// the requested row
while (m_row < row)
{
if (!nextRow())
{
return false;
}
}
return true;
}
/** Copy the pixels from the current RLE entry the specified number of times.
*
* @param npixels The number of pixels to copy. Must be less than or equal
* to m_remaining (not checked here, must be handled by higher level code).
* @param data The memory location provided by the caller
* in which to return the data. This should be at least
* (getWidth()*getBitsPerPixl() + 7)/8 bytes in length
* and properly aligned for the pixel color format.
*/
void CRlePaletteBitmap::copyColor(nxgl_coord_t npixels, FAR void *data)
{
// Right now, only a single pixel depth is supported
nxwidget_pixel_t *nxlut = (nxwidget_pixel_t *)m_lut;
nxwidget_pixel_t color = nxlut[m_rle->lookup];
// Copy the requested pixels
FAR nxwidget_pixel_t *dest = (FAR nxwidget_pixel_t *)data;
for (int i = 0; i < npixels; i++)
{
*dest++ = color;
}
// Adjust the number of pixels remaining in the RLE entry
m_remaining -= npixels;
}
/** Copy pixels from the current position
*
* @param npixels The number of pixels to copy
* @param data The memory location provided by the caller
* in which to return the data. This should be at least
* (getWidth()*getBitsPerPixl() + 7)/8 bytes in length
* and properly aligned for the pixel color format.
* @return False if this goes beyond the end of the image
*/
bool CRlePaletteBitmap::copyPixels(nxgl_coord_t npixels, FAR void *data)
{
FAR nxwidget_pixel_t *ptr = (FAR nxwidget_pixel_t *)data;
do
{
// Get values in the current RLE entry
if (m_remaining > npixels)
{
// Copy npixels from the current RLE entry (it won't be empty)
copyColor(npixels, (FAR void *)ptr);
// Then advance row/column position information
return advancePosition(npixels);
}
// Not enough (or just enough) in the current entry. Take what we
// can from the current entry and move to the next entry
uint8_t nTaken = m_remaining; // Temporary.. copyColor clobbers m_remaining
npixels -= m_remaining; // New number of pixels needed
// Copy all of the colors available in this RLE entry
copyColor(m_remaining, (FAR void *)ptr);
// Then advance row/column position information
if (!advancePosition(nTaken))
{
return false;
}
// Advance the destination pointer by the number of pixels taken
// from the RLE entry
ptr += nTaken;
// Then move to the next RLE entry
m_rle++;
m_remaining = m_rle->npixels;
}
while (npixels > 0);
return true;
}
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