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author | Gregory Nutt <gnutt@nuttx.org> | 2013-10-15 11:09:20 -0600 |
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committer | Gregory Nutt <gnutt@nuttx.org> | 2013-10-15 11:09:20 -0600 |
commit | 24ee5014675d43c80c0580882fe5cc24ca17e7a8 (patch) | |
tree | e723687b37dcce6d8d582830c8ca0d52d057e9c6 /NxWidgets/libnxwidgets/src | |
parent | b5a37a3e45ac9faea285cc252e742c1c7267a6d7 (diff) | |
download | nuttx-24ee5014675d43c80c0580882fe5cc24ca17e7a8.tar.gz nuttx-24ee5014675d43c80c0580882fe5cc24ca17e7a8.tar.bz2 nuttx-24ee5014675d43c80c0580882fe5cc24ca17e7a8.zip |
NxWidgets::CScaledImage: New class that wraps any class that provides IBitMap and adds image scaling
Diffstat (limited to 'NxWidgets/libnxwidgets/src')
-rw-r--r-- | NxWidgets/libnxwidgets/src/cbitmap.cxx | 4 | ||||
-rw-r--r-- | NxWidgets/libnxwidgets/src/crlepalettebitmap.cxx | 2 | ||||
-rw-r--r-- | NxWidgets/libnxwidgets/src/cscaledbitmap.cxx | 583 |
3 files changed, 586 insertions, 3 deletions
diff --git a/NxWidgets/libnxwidgets/src/cbitmap.cxx b/NxWidgets/libnxwidgets/src/cbitmap.cxx index c9c974814..c0cf71ea4 100644 --- a/NxWidgets/libnxwidgets/src/cbitmap.cxx +++ b/NxWidgets/libnxwidgets/src/cbitmap.cxx @@ -149,7 +149,7 @@ const nxgl_coord_t CBitmap::getHeight(void) const * @return The bitmap's width. */ -const nxgl_coord_t CBitmap::getStride(void) const +const size_t CBitmap::getStride(void) const { return m_bitmap->stride; } @@ -172,7 +172,7 @@ bool CBitmap::getRun(nxgl_coord_t x, nxgl_coord_t y, nxgl_coord_t width, { // Check ranges. Casts to unsigned int are ugly but permit one-sided comparisons - if (((unsigned int)x < (unsigned int)width) && + if (((unsigned int)x < (unsigned int)m_bitmap->width) && ((unsigned int)(x + width) <= (unsigned int)m_bitmap->width) && ((unsigned int)y < (unsigned int)m_bitmap->height)) { diff --git a/NxWidgets/libnxwidgets/src/crlepalettebitmap.cxx b/NxWidgets/libnxwidgets/src/crlepalettebitmap.cxx index 99f7fdbba..241736add 100644 --- a/NxWidgets/libnxwidgets/src/crlepalettebitmap.cxx +++ b/NxWidgets/libnxwidgets/src/crlepalettebitmap.cxx @@ -155,7 +155,7 @@ const nxgl_coord_t CRlePaletteBitmap::getHeight(void) const * @return The bitmap's width. */ -const nxgl_coord_t CRlePaletteBitmap::getStride(void) const +const size_t CRlePaletteBitmap::getStride(void) const { // This only works if the bpp is an even multiple of 8-bit bytes diff --git a/NxWidgets/libnxwidgets/src/cscaledbitmap.cxx b/NxWidgets/libnxwidgets/src/cscaledbitmap.cxx new file mode 100644 index 000000000..6fe211ca4 --- /dev/null +++ b/NxWidgets/libnxwidgets/src/cscaledbitmap.cxx @@ -0,0 +1,583 @@ +/**************************************************************************** + * NxWidgets/libnxwidgets/src/cscaledbitmap.hxx + * + * Copyright (C) 2013 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdint.h> +#include <stdbool.h> +#include <cstring> + +#include <nuttx/nx/nxglib.h> + +#include "cscaledbitmap.hxx" + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Method Implementations + ****************************************************************************/ + +using namespace NXWidgets; + +/** + * Constructor. + * + * @param bitmap The bitmap structure being scaled. + * @newSize The new, scaled size of the image + */ + +CScaledBitmap::CScaledBitmap(IBitmap *bitmap, struct nxgl_size_s &newSize) +: m_bitmap(bitmap), m_size(newSize) +{ + // xScale will be used to convert a request X position to an X position + // in the contained bitmap: + // + // xImage = xRequested * oldWidth / newWidth + // = xRequested * xScale + + m_xScale = itob16((uint32_t)m_bitmap->getWidth()) / newSize.w; + + // Similarly, yScale will be used to convert a request Y position to a Y + // positionin the contained bitmap: + // + // yImage = yRequested * oldHeight / newHeight + // = yRequested * yScale + + m_xScale = itob16((uint32_t)m_bitmap->getHeight()) / newSize.h; + + // Allocate and initialize the row cache + + size_t stride = bitmap->getStride(); + m_rowCache[0] = new uint8_t(stride); + m_rowCache[1] = new uint8_t(stride); + + // Read the first two rows into the cache + + cacheRows(0); +} + +/** + * Destructor. + */ + +CScaledBitmap::~CScaledBitmap(void) +{ + if (m_rowCache[0]) + { + delete m_rowCache[0]; + } + + if (m_rowCache[1]) + { + delete m_rowCache[1]; + } +} + +/** + * Get the bitmap's color format. + * + * @return The bitmap's width. + */ + +const uint8_t CScaledBitmap::getColorFormat(void) const +{ + return m_bitmap->getColorFormat(); +} + +/** + * Get the bitmap's color format. + * + * @return The bitmap's color format. + */ + +const uint8_t CScaledBitmap::getBitsPerPixel(void) const +{ + return m_bitmap->getBitsPerPixel(); +} + +/** + * Get the bitmap's width (in pixels/columns). + * + * @return The bitmap's pixel depth. + */ + +const nxgl_coord_t CScaledBitmap::getWidth(void) const +{ + return m_size.w; +} + +/** + * Get the bitmap's height (in rows). + * + * @return The bitmap's height (in rows). + */ + +const nxgl_coord_t CScaledBitmap::getHeight(void) const +{ + return m_size.h; +} + +/** + * Get the bitmap's width (in bytes). + * + * @return The bitmap's width (in bytes). + */ + +const size_t CScaledBitmap::getStride(void) const +{ + return (m_bitmap->getBitsPerPixel() * m_size.w + 7) / 8; +} + +/** + * Get one row from the bit map image. + * + * @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 CScaledBitmap::getRun(nxgl_coord_t x, nxgl_coord_t y, + nxgl_coord_t width, FAR void *data) +{ +#if CONFIG_NXWIDGETS_FMT == FB_FMT_RGB8_332 || CONFIG_NXWIDGETS_FMT == FB_FMT_RGB24 + FAR uint8_t *dest = (FAR uint8_t *)data; +#elif CONFIG_NXWIDGETS_FMT == FB_FMT_RGB16_565 + FAR uint16_t *dest = (FAR uint16_t *)data; +#elif CONFIG_NXWIDGETS_FMT == FB_FMT_RGB32 + FAR uint32_t *dest = (FAR uint32_t *)data; +#else +# error Unsupported, invalid, or undefined color format +#endif + + // Check ranges. Casts to unsigned int are ugly but permit one-sided comparisons + + if (((unsigned int)x >= (unsigned int)m_size.w) && + ((unsigned int)(x + width) > (unsigned int)m_size.w) && + ((unsigned int)y <= (unsigned int)m_size.h)) + { + return false; + } + + // Get the row number in the unscaled image corresponding to the + // requested y position. This must be either the exact row or the + // closest row just before the requested position + + b16_t row16 = y * m_yScale; + nxgl_coord_t row = b16toi(row16); + + // Get that row and the one after it into the row cache. We know that + // the pixel value that we want is one between the two rows. This + // may seem wasteful to read two entire rows. However, in normal usage + // we will be traversal each image from top-left to bottom-right in + // order. In that case, the caching is most efficient. + + if (!cacheRows(row)) + { + return false; + } + + // Now scale and copy the data from the cached row data + + for (int i = 0; i < width; i++, x++) + { + // Get the column number in the unscaled row corresponding to the + // requested x position. This must be either the exact column or the + // closest column just before the requested position + + b16_t column = x * m_xScale; + + // Get the color at the position on the first row + + struct rgbcolor_s color1; + if (!rowColor(m_rowCache[0], column, color1)) + { + gdbg("ERROR rowColor failed for the first row\n"); + return false; + } + + // Get the color at the position on the first row + + struct rgbcolor_s color2; + if (!rowColor(m_rowCache[1], column, color2)) + { + gdbg("ERROR rowColor failed for the second row\n"); + return false; + } + + // Check for transparent colors + + bool transparent1; + bool transparent2; + +#if CONFIG_NXWIDGETS_FMT == FB_FMT_RGB8_332 + uint8_t color = RGBTO8(color1.r, color1.g, color1.b); + transparent1 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + + color = RGBTO8(color2.r, color2.g, color2.b); + transparent2 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + +#elif CONFIG_NXWIDGETS_FMT == FB_FMT_RGB16_565 + uint16_t color = RGBTO16(color1.r, color1.g, color1.b); + transparent1 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + + color = RGBTO16(color2.r, color2.g, color2.b); + transparent2 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + +#elif CONFIG_NXWIDGETS_FMT == FB_FMT_RGB24 || CONFIG_NXWIDGETS_FMT == FB_FMT_RGB32 + uint32_t color = RGBTO24(color1.r, color1.g, color1.b); + transparent1 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + + color = RGBTO24(color2.r, color2.g, color2.b); + transparent2 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + +#else +# error Unsupported, invalid, or undefined color format +#endif + + // Is one of the colors transparent? + + struct rgbcolor_s scaledColor; + b16_t fraction b16frac(row16); + + if (transparent1 || transparent2) + { + // Yes.. don't interpolate within transparent regions or + // between transparent and opaque regions. + + // Get the color closest to the requested position + + if (fraction < b16HALF) + { + scaledColor.r = color1.r; + scaledColor.g = color1.g; + scaledColor.b = color1.b; + } + else + { + scaledColor.r = color2.r; + scaledColor.g = color2.g; + scaledColor.b = color2.b; + } + } + else + { + // No.. both colors are opaque + + if (!scaleColor(color1, color2, fraction, scaledColor)) + { + return false; + } + } + + // Write the interpolated data to the user buffer + +#if CONFIG_NXWIDGETS_FMT == FB_FMT_RGB8_332 + color = RGBTO8(scaledColor.r, scaledColor.g, scaledColor.b); + *dest++ = color; + +#elif CONFIG_NXWIDGETS_FMT == FB_FMT_RGB16_565 + color = RGBTO16(scaledColor.r, scaledColor.g, scaledColor.b); + *dest++ = color; + +#elif CONFIG_NXWIDGETS_FMT == FB_FMT_RGB24 + *dest++ = color2.b; + *dest++ = color2.r; + *dest++ = color2.g; + +#elif CONFIG_NXWIDGETS_FMT == FB_FMT_RGB32 + color = RGBTO24(scaledColor.r, scaledColor.g, scaledColor.b); + *dest++ = color; + +#else +# error Unsupported, invalid, or undefined color format +#endif + } + + return true; +} + +/** + * Read two rows into the row cache + * + * @param row - The row number of the first row to cache + */ + +bool CScaledBitmap::cacheRows(unsigned int row) +{ + nxgl_coord_t bitmapWidth = m_bitmap->getWidth(); + nxgl_coord_t bitmapHeight = m_bitmap->getHeight(); + + // A common case is to advance by one row. In this case, we only + // need to read one row + + if (row == m_row + 1) + { + // Swap rows + + FAR uint8_t *saveRow = m_rowCache[0]; + m_rowCache[0] = m_rowCache[1]; + m_rowCache[1] = saveRow; + + // Save number of the first row that we have in the cache + + m_row = row; + + // Now read the new row into the second row cache buffer + + if (++row >= (unsigned int)bitmapHeight) + { + row = bitmapHeight - 1; + } + + if (!m_bitmap->getRun(0, row, bitmapWidth, &m_rowCache[1])) + { + gdbg("Failed to read bitmap row %d\n", row); + return false; + } + } + + // Do we need to read two new rows? Or do we already have the + // request row in the cache? + + else if (row != m_row) + { + // Read the first row into the cache + + if (row >= (unsigned int)bitmapHeight) + { + row = bitmapHeight - 1; + } + + if (!m_bitmap->getRun(0, row, bitmapWidth, &m_rowCache[0])) + { + gdbg("Failed to read bitmap row %d\n", row); + return false; + } + + // Save number of the first row that we have in the cache + + m_row = row; + + // Read the next row into the cache + + if (++row >= (unsigned int)bitmapHeight) + { + row = bitmapHeight - 1; + } + + if (!m_bitmap->getRun(0, row, bitmapWidth, &m_rowCache[1])) + { + gdbg("Failed to read bitmap row %d\n", row); + return false; + } + } + + return true; +} + +/** + * Given an two RGB colors and a fractional value, return the scaled + * value between the two colors. + * + * @param incolor1 - The first color to be used + * @param incolor2 - The second color to be used + * @param fraction - The fractional value + * @param outcolor - The returned, scaled color + */ + +bool CScaledBitmap::scaleColor(FAR const struct rgbcolor_s &incolor1, + FAR const struct rgbcolor_s &incolor2, + b16_t fraction, FAR struct rgbcolor_s &outcolor) +{ + unsigned int red; + unsigned int green; + unsigned int blue; + b16_t remainder = b16ONE - fraction; + + red = (unsigned int)incolor1.r * fraction + + (unsigned int)incolor2.r * remainder; + green = (unsigned int)incolor1.g * fraction + + (unsigned int)incolor2.g * remainder; + blue = (unsigned int)incolor1.b * fraction + + (unsigned int)incolor2.b * remainder; + + outcolor.r = red < 256 ? red : 255; + outcolor.g = green < 256 ? green : 255; + outcolor.b = blue < 256 ? blue : 255; + return true; +} + +/** + * Given an image row and a non-integer column offset, return the + * interpolated RGB color value corresponding to that position + * + * @param row - The pointer to the row in the row cache to use + * @param column - The non-integer column offset + * @param outcolor - The returned, interpolated color + * + */ + +bool CScaledBitmap::rowColor(FAR uint8_t *row, b16_t column, + FAR struct rgbcolor_s &outcolor) +{ + // This is the col at or just before the pixel of interest + + nxgl_coord_t col1 = b16toi(column); + nxgl_coord_t col2 = col1 + 1; + + nxgl_coord_t bitmapWidth = m_bitmap->getWidth(); + if (col2 >= bitmapWidth) + { + col2 = bitmapWidth - 1; + } + + b16_t fraction = b16frac(column); + + struct rgbcolor_s color1; + struct rgbcolor_s color2; + + bool transparent1; + bool transparent2; + +#if CONFIG_NXWIDGETS_FMT == FB_FMT_RGB8_332 + uint8_t color = row[col1]; + color1.r = RBG8RED(color); + color1.g = RBG8GREEN(color); + color1.b = RBG8BLUE(color); + + transparent1 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + + color = row[col2]; + color2.r = RBG8RED(color); + color2.g = RBG8GREEN(color); + color2.b = RBG8BLUE(color); + + transparent2 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + +#elif CONFIG_NXWIDGETS_FMT == FB_FMT_RGB16_565 + FAR uint16_t *row16 = (FAR uint16_t*)row; + uint16_t color = row16[col1]; + color1.r = RBG16RED(color); + color1.g = RBG16GREEN(color); + color1.b = RBG16BLUE(color); + + transparent1 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + + color = row16[col2]; + color2.r = RBG16RED(color); + color2.g = RBG16GREEN(color); + color2.b = RBG16BLUE(color); + + transparent2 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + +#elif CONFIG_NXWIDGETS_FMT == FB_FMT_RGB24 + unsigned int ndx = 3*col1; + color1.r = row[ndx+2]; + color1.g = row[ndx+1]; + color1.b = row[ndx]; + + uint32_t color = RGBTO24(color1.r, color1.g, color1.b); + transparent1 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + + ndx = 3*col2; + color2.r = row[ndx+2]; + color2.g = row[ndx+1]; + color2.b = row[ndx]; + + color = RGBTO24(color2.r, color2.g, color2.b); + transparent2 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + +#elif CONFIG_NXWIDGETS_FMT == FB_FMT_RGB32 + FAR uint32_t *row32 = (FAR uint32_t*)row; + uint32_t color = row32[col1]; + color1.r = RBG24RED(color); + color1.g = RBG24GREEN(color); + color1.b = RBG24BLUE(color); + + transparent1 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + + color = row32[col2]; + color2.r = RBG24RED(color); + color2.g = RBG24GREEN(color); + color2.b = RBG24BLUE(color); + + transparent2 = (color == CONFIG_NXWIDGETS_TRANSPARENT_COLOR); + +#else +# error Unsupported, invalid, or undefined color format +#endif + + // Is one of the colors transparent? + + if (transparent1 || transparent2) + { + // Yes.. don't interpolate within transparent regions or + // between transparent and opaque regions. + + // Return the color closest to the requested position + + if (fraction < b16HALF) + { + outcolor.r = color1.r; + outcolor.g = color1.b; + outcolor.g = color1.g; + } + else + { + outcolor.r = color2.r; + outcolor.g = color2.b; + outcolor.g = color2.g; + } + + return true; + } + else + { + // No.. both colors are opaque + + return scaleColor(color1, color2, fraction, outcolor); + } +} |