Essai d'application Lycée Malraux NSI
Dependencies: BLE_API nRF51822 mbed-dev-bin
Diff: source/types/MicroBitImage.cpp
- Revision:
- 1:8aa5cdb4ab67
- Child:
- 69:b62f231e51ce
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/source/types/MicroBitImage.cpp Thu Apr 07 01:33:22 2016 +0100 @@ -0,0 +1,887 @@ +/* +The MIT License (MIT) + +Copyright (c) 2016 British Broadcasting Corporation. +This software is provided by Lancaster University by arrangement with the BBC. + +Permission is hereby granted, free of charge, to any person obtaining a +copy of this software and associated documentation files (the "Software"), +to deal in the Software without restriction, including without limitation +the rights to use, copy, modify, merge, publish, distribute, sublicense, +and/or sell copies of the Software, and to permit persons to whom the +Software is furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL +THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. +*/ + +/** + * Class definition for a MicroBitImage. + * + * An MicroBitImage is a simple bitmap representation of an image. + * n.b. This is a mutable, managed type. + */ + +#include "MicroBitConfig.h" +#include "MicroBitImage.h" +#include "MicroBitFont.h" +#include "MicroBitCompat.h" +#include "ManagedString.h" +#include "ErrorNo.h" + + +/** + * The null image. We actally create a small one byte buffer here, just to keep NULL pointers out of the equation. + */ +static const uint16_t empty[] __attribute__ ((aligned (4))) = { 0xffff, 1, 1, 0, }; +MicroBitImage MicroBitImage::EmptyImage((ImageData*)(void*)empty); + +/** + * Default Constructor. + * Creates a new reference to the empty MicroBitImage bitmap + * + * @code + * MicroBitImage i(); //an empty image instance + * @endcode + */ +MicroBitImage::MicroBitImage() +{ + // Create new reference to the EmptyImage and we're done. + init_empty(); +} + + +/** + * Constructor. + * Create a blank bitmap representation of a given size. + * + * @param x the width of the image. + * + * @param y the height of the image. + * + * Bitmap buffer is linear, with 8 bits per pixel, row by row, + * top to bottom with no word alignment. Stride is therefore the image width in pixels. + * in where w and h are width and height respectively, the layout is therefore: + * + * |[0,0]...[w,o][1,0]...[w,1] ... [[w,h] + * + * A copy of the image is made in RAM, as images are mutable. + * + * TODO: Consider an immutable flavour, which might save us RAM for animation spritesheets... + * ...as these could be kept in FLASH. + */ +MicroBitImage::MicroBitImage(const int16_t x, const int16_t y) +{ + this->init(x,y,NULL); +} + +/** + * Copy Constructor. + * Add ourselves as a reference to an existing MicroBitImage. + * + * @param image The MicroBitImage to reference. + * + * @code + * MicroBitImage i("0,1,0,1,0\n"); + * MicroBitImage i2(i); //points to i + * @endcode + */ +MicroBitImage::MicroBitImage(const MicroBitImage &image) +{ + ptr = image.ptr; + ptr->incr(); +} + +/** + * Constructor. + * Create a blank bitmap representation of a given size. + * + * @param s A text based representation of the image given whitespace delimited numeric values. + * + * @code + * MicroBitImage i("0,1,0,1,0\n1,0,1,0,1\n0,1,0,1,0\n1,0,1,0,1\n0,1,0,1,0\n"); // 5x5 image + * @endcode + */ +MicroBitImage::MicroBitImage(const char *s) +{ + int width = 0; + int height = 0; + int count = 0; + int digit = 0; + + char parseBuf[10]; + + const char *parseReadPtr; + char *parseWritePtr; + uint8_t *bitmapPtr; + + if (s == NULL) + { + init_empty(); + return; + } + + // First pass: Parse the string to determine the geometry of the image. + // We do this from first principles to avoid unecessary load of the strtok() libs etc. + parseReadPtr = s; + + while (*parseReadPtr) + { + if (isdigit(*parseReadPtr)) + { + // Ignore numbers. + digit = 1; + } + else if (*parseReadPtr =='\n') + { + if (digit) + { + count++; + digit = 0; + } + + height++; + + width = count > width ? count : width; + count = 0; + } + else + { + if (digit) + { + count++; + digit = 0; + } + } + + parseReadPtr++; + } + + this->init(width, height, NULL); + + // Second pass: collect the data. + parseReadPtr = s; + parseWritePtr = parseBuf; + bitmapPtr = this->getBitmap(); + + while (*parseReadPtr) + { + if (isdigit(*parseReadPtr)) + { + *parseWritePtr = *parseReadPtr; + parseWritePtr++; + } + else + { + *parseWritePtr = 0; + if (parseWritePtr > parseBuf) + { + *bitmapPtr = atoi(parseBuf); + bitmapPtr++; + parseWritePtr = parseBuf; + } + } + + parseReadPtr++; + } +} + +/** + * Constructor. + * Create an image from a specially prepared constant array, with no copying. Will call ptr->incr(). + * + * @param ptr The literal - first two bytes should be 0xff, then width, 0, height, 0, and the bitmap. Width and height are 16 bit. The literal has to be 4-byte aligned. + * + * @code + * static const uint8_t heart[] __attribute__ ((aligned (4))) = { 0xff, 0xff, 10, 0, 5, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, }; // a cute heart + * MicroBitImage i((ImageData*)(void*)heart); + * @endcode + */ +MicroBitImage::MicroBitImage(ImageData *p) +{ + ptr = p; + ptr->incr(); +} + +/** + * Get current ptr, do not decr() it, and set the current instance to empty image. + * + * This is to be used by specialized runtimes which pass ImageData around. + */ +ImageData *MicroBitImage::leakData() +{ + ImageData* res = ptr; + init_empty(); + return res; +} + + +/** + * Constructor. + * Create a bitmap representation of a given size, based on a given buffer. + * + * @param x the width of the image. + * + * @param y the height of the image. + * + * @param bitmap a 2D array representing the image. + * + * @code + * const uint8_t heart[] = { 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, }; // a cute heart + * MicroBitImage i(10,5,heart); + * @endcode + */ +MicroBitImage::MicroBitImage(const int16_t x, const int16_t y, const uint8_t *bitmap) +{ + this->init(x,y,bitmap); +} + +/** + * Destructor. + * + * Removes buffer resources held by the instance. + */ +MicroBitImage::~MicroBitImage() +{ + ptr->decr(); +} + +/** + * Internal constructor which defaults to the EmptyImage instance variable + */ +void MicroBitImage::init_empty() +{ + ptr = (ImageData*)(void*)empty; +} + +/** + * Internal constructor which provides sanity checking and initialises class properties. + * + * @param x the width of the image + * + * @param y the height of the image + * + * @param bitmap an array of integers that make up an image. + */ +void MicroBitImage::init(const int16_t x, const int16_t y, const uint8_t *bitmap) +{ + //sanity check size of image - you cannot have a negative sizes + if(x < 0 || y < 0) + { + init_empty(); + return; + } + + + // Create a copy of the array + ptr = (ImageData*)malloc(sizeof(ImageData) + x * y); + ptr->init(); + ptr->width = x; + ptr->height = y; + + // create a linear buffer to represent the image. We could use a jagged/2D array here, but experimentation + // showed this had a negative effect on memory management (heap fragmentation etc). + + if (bitmap) + this->printImage(x,y,bitmap); + else + this->clear(); +} + +/** + * Copy assign operation. + * + * Called when one MicroBitImage is assigned the value of another using the '=' operator. + * + * Decrement our reference count and free up the buffer as necessary. + * + * Then, update our buffer to refer to that of the supplied MicroBitImage, + * and increase its reference count. + * + * @param s The MicroBitImage to reference. + * + * @code + * const uint8_t heart[] = { 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, }; // a cute heart + * MicroBitImage i(10,5,heart); + * MicroBitImage i1(); + * i1 = i; // i1 now references i + * @endcode + */ +MicroBitImage& MicroBitImage::operator = (const MicroBitImage& i) +{ + if(ptr == i.ptr) + return *this; + + ptr->decr(); + ptr = i.ptr; + ptr->incr(); + + return *this; +} + +/** + * Equality operation. + * + * Called when one MicroBitImage is tested to be equal to another using the '==' operator. + * + * @param i The MicroBitImage to test ourselves against. + * + * @return true if this MicroBitImage is identical to the one supplied, false otherwise. + * + * @code + * MicroBitDisplay display; + * MicroBitImage i(); + * MicroBitImage i1(); + * + * if(i == i1) //will be true + * display.scroll("true"); + * @endcode + */ +bool MicroBitImage::operator== (const MicroBitImage& i) +{ + if (ptr == i.ptr) + return true; + else + return (ptr->width == i.ptr->width && ptr->height == i.ptr->height && (memcmp(getBitmap(), i.ptr->data, getSize())==0)); +} + + +/** + * Resets all pixels in this image to 0. + * + * @code + * MicroBitImage i("0,1,0,1,0\n1,0,1,0,1\n0,1,0,1,0\n1,0,1,0,1\n0,1,0,1,0\n"); // 5x5 image + * i.clear(); + * @endcode + */ +void MicroBitImage::clear() +{ + memclr(getBitmap(), getSize()); +} + +/** + * Sets the pixel at the given co-ordinates to a given value. + * + * @param x The co-ordinate of the pixel to change. + * + * @param y The co-ordinate of the pixel to change. + * + * @param value The new value of the pixel (the brightness level 0-255) + * + * @return MICROBIT_OK, or MICROBIT_INVALID_PARAMETER. + * + * @code + * MicroBitImage i("0,1,0,1,0\n1,0,1,0,1\n0,1,0,1,0\n1,0,1,0,1\n0,1,0,1,0\n"); // 5x5 image + * i.setPixelValue(0,0,255); + * @endcode + * + * @note all coordinates originate from the top left of an image. + */ +int MicroBitImage::setPixelValue(int16_t x , int16_t y, uint8_t value) +{ + //sanity check + if(x >= getWidth() || y >= getHeight() || x < 0 || y < 0) + return MICROBIT_INVALID_PARAMETER; + + this->getBitmap()[y*getWidth()+x] = value; + return MICROBIT_OK; +} + +/** + * Retreives the value of a given pixel. + * + * @param x The x co-ordinate of the pixel to read. Must be within the dimensions of the image. + * + * @param y The y co-ordinate of the pixel to read. Must be within the dimensions of the image. + * + * @return The value assigned to the given pixel location (the brightness level 0-255), or MICROBIT_INVALID_PARAMETER. + * + * @code + * MicroBitImage i("0,1,0,1,0\n1,0,1,0,1\n0,1,0,1,0\n1,0,1,0,1\n0,1,0,1,0\n"); // 5x5 image + * i.getPixelValue(0,0); //should be 0; + * @endcode + */ +int MicroBitImage::getPixelValue(int16_t x , int16_t y) +{ + //sanity check + if(x >= getWidth() || y >= getHeight() || x < 0 || y < 0) + return MICROBIT_INVALID_PARAMETER; + + return this->getBitmap()[y*getWidth()+x]; +} + +/** + * Replaces the content of this image with that of a given 2D array representing + * the image. + * + * @param x the width of the image. Must be within the dimensions of the image. + * + * @param y the width of the image. Must be within the dimensions of the image. + * + * @param bitmap a 2D array representing the image. + * + * @return MICROBIT_OK on success, or MICROBIT_INVALID_PARAMETER. + * + * @code + * const uint8_t heart[] = { 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, }; // a cute heart + * MicroBitImage i(); + * i.printImage(0,0,heart); + * @endcode + * + * @note all coordinates originate from the top left of an image. + */ +int MicroBitImage::printImage(int16_t width, int16_t height, const uint8_t *bitmap) +{ + const uint8_t *pIn; + uint8_t *pOut; + int pixelsToCopyX, pixelsToCopyY; + + // Sanity check. + if (width <= 0 || width <= 0 || bitmap == NULL) + return MICROBIT_INVALID_PARAMETER; + + // Calcualte sane start pointer. + pixelsToCopyX = min(width,this->getWidth()); + pixelsToCopyY = min(height,this->getHeight()); + + pIn = bitmap; + pOut = this->getBitmap(); + + // Copy the image, stride by stride. + for (int i=0; i<pixelsToCopyY; i++) + { + memcpy(pOut, pIn, pixelsToCopyX); + pIn += width; + pOut += this->getWidth(); + } + + return MICROBIT_OK; +} + +/** + * Pastes a given bitmap at the given co-ordinates. + * + * Any pixels in the relvant area of this image are replaced. + * + * @param image The MicroBitImage to paste. + * + * @param x The leftmost X co-ordinate in this image where the given image should be pasted. Defaults to 0. + * + * @param y The uppermost Y co-ordinate in this image where the given image should be pasted. Defaults to 0. + * + * @param alpha set to 1 if transparency clear pixels in given image should be treated as transparent. Set to 0 otherwise. Defaults to 0. + * + * @return The number of pixels written. + * + * @code + * const uint8_t heart[] = { 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, }; // a cute heart + * MicroBitImage i(10,5,heart); // a big heart + * i.paste(i, -5, 0); // a small heart + * @endcode + */ +int MicroBitImage::paste(const MicroBitImage &image, int16_t x, int16_t y, uint8_t alpha) +{ + uint8_t *pIn, *pOut; + int cx, cy; + int pxWritten = 0; + + // Sanity check. + // We permit writes that overlap us, but ones that are clearly out of scope we can filter early. + if (x >= getWidth() || y >= getHeight() || x+image.getWidth() <= 0 || y+image.getHeight() <= 0) + return 0; + + //Calculate the number of byte we need to copy in each dimension. + cx = x < 0 ? min(image.getWidth() + x, getWidth()) : min(image.getWidth(), getWidth() - x); + cy = y < 0 ? min(image.getHeight() + y, getHeight()) : min(image.getHeight(), getHeight() - y); + + // Calculate sane start pointer. + pIn = image.ptr->data; + pIn += (x < 0) ? -x : 0; + pIn += (y < 0) ? -image.getWidth()*y : 0; + + pOut = getBitmap(); + pOut += (x > 0) ? x : 0; + pOut += (y > 0) ? getWidth()*y : 0; + + // Copy the image, stride by stride + // If we want primitive transparecy, we do this byte by byte. + // If we don't, use a more efficient block memory copy instead. Every little helps! + + if (alpha) + { + for (int i=0; i<cy; i++) + { + for (int j=0; j<cx; j++) + { + // Copy this byte if appropriate. + if (*(pIn+j) != 0){ + *(pOut+j) = *(pIn+j); + pxWritten++; + } + } + + pIn += image.getWidth(); + pOut += getWidth(); + } + } + else + { + for (int i=0; i<cy; i++) + { + memcpy(pOut, pIn, cx); + + pxWritten += cx; + pIn += image.getWidth(); + pOut += getWidth(); + } + } + + return pxWritten; +} + +/** + * Prints a character to the display at the given location + * + * @param c The character to display. + * + * @param x The x co-ordinate of on the image to place the top left of the character. Defaults to 0. + * + * @param y The y co-ordinate of on the image to place the top left of the character. Defaults to 0. + * + * @return MICROBIT_OK on success, or MICROBIT_INVALID_PARAMETER. + * + * @code + * MicroBitImage i(5,5); + * i.print('a'); + * @endcode + */ +int MicroBitImage::print(char c, int16_t x, int16_t y) +{ + unsigned char v; + int x1, y1; + + MicroBitFont font = MicroBitFont::getSystemFont(); + + // Sanity check. Silently ignore anything out of bounds. + if (x >= getWidth() || y >= getHeight() || c < MICROBIT_FONT_ASCII_START || c > font.asciiEnd) + return MICROBIT_INVALID_PARAMETER; + + // Paste. + int offset = (c-MICROBIT_FONT_ASCII_START) * 5; + + for (int row=0; row<MICROBIT_FONT_HEIGHT; row++) + { + v = (char)*(font.characters + offset); + + offset++; + + // Update our Y co-ord write position + y1 = y+row; + + for (int col = 0; col < MICROBIT_FONT_WIDTH; col++) + { + // Update our X co-ord write position + x1 = x+col; + + if (x1 < getWidth() && y1 < getHeight()) + this->getBitmap()[y1*getWidth()+x1] = (v & (0x10 >> col)) ? 255 : 0; + } + } + + return MICROBIT_OK; +} + + +/** + * Shifts the pixels in this Image a given number of pixels to the left. + * + * @param n The number of pixels to shift. + * + * @return MICROBIT_OK on success, or MICROBIT_INVALID_PARAMETER. + * + * @code + * const uint8_t heart[] = { 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, }; // a cute heart + * MicroBitImage i(10,5,heart); // a big heart + * i.shiftLeft(5); // a small heart + * @endcode + */ +int MicroBitImage::shiftLeft(int16_t n) +{ + uint8_t *p = getBitmap(); + int pixels = getWidth()-n; + + if (n <= 0 ) + return MICROBIT_INVALID_PARAMETER; + + if(n >= getWidth()) + { + clear(); + return MICROBIT_OK; + } + + for (int y = 0; y < getHeight(); y++) + { + // Copy, and blank fill the rightmost column. + memcpy(p, p+n, pixels); + memclr(p+pixels, n); + p += getWidth(); + } + + return MICROBIT_OK; +} + +/** + * Shifts the pixels in this Image a given number of pixels to the right. + * + * @param n The number of pixels to shift. + * + * @return MICROBIT_OK on success, or MICROBIT_INVALID_PARAMETER. + * + * @code + * const uint8_t heart[] = { 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, }; // a cute heart + * MicroBitImage i(10,5,heart); // a big heart + * i.shiftLeft(5); // a small heart + * i.shiftRight(5); // a big heart + * @endcode + */ +int MicroBitImage::shiftRight(int16_t n) +{ + uint8_t *p = getBitmap(); + int pixels = getWidth()-n; + + if (n <= 0) + return MICROBIT_INVALID_PARAMETER; + + if(n >= getWidth()) + { + clear(); + return MICROBIT_OK; + } + + for (int y = 0; y < getHeight(); y++) + { + // Copy, and blank fill the leftmost column. + memmove(p+n, p, pixels); + memclr(p, n); + p += getWidth(); + } + + return MICROBIT_OK; +} + + +/** + * Shifts the pixels in this Image a given number of pixels to upward. + * + * @param n The number of pixels to shift. + * + * @return MICROBIT_OK on success, or MICROBIT_INVALID_PARAMETER. + * + * @code + * const uint8_t heart[] = { 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, }; // a cute heart + * MicroBitImage i(10,5,heart); + * i.shiftUp(1); + * @endcode + */ +int MicroBitImage::shiftUp(int16_t n) +{ + uint8_t *pOut, *pIn; + + if (n <= 0 ) + return MICROBIT_INVALID_PARAMETER; + + if(n >= getHeight()) + { + clear(); + return MICROBIT_OK; + } + + pOut = getBitmap(); + pIn = getBitmap()+getWidth()*n; + + for (int y = 0; y < getHeight(); y++) + { + // Copy, and blank fill the leftmost column. + if (y < getHeight()-n) + memcpy(pOut, pIn, getWidth()); + else + memclr(pOut, getWidth()); + + pIn += getWidth(); + pOut += getWidth(); + } + + return MICROBIT_OK; +} + + +/** + * Shifts the pixels in this Image a given number of pixels to downward. + * + * @param n The number of pixels to shift. + * + * @return MICROBIT_OK on success, or MICROBIT_INVALID_PARAMETER. + * + * @code + * const uint8_t heart[] = { 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, }; // a cute heart + * MicroBitImage i(10,5,heart); + * i.shiftDown(1); + * @endcode + */ +int MicroBitImage::shiftDown(int16_t n) +{ + uint8_t *pOut, *pIn; + + if (n <= 0 ) + return MICROBIT_INVALID_PARAMETER; + + if(n >= getHeight()) + { + clear(); + return MICROBIT_OK; + } + + pOut = getBitmap() + getWidth()*(getHeight()-1); + pIn = pOut - getWidth()*n; + + for (int y = 0; y < getHeight(); y++) + { + // Copy, and blank fill the leftmost column. + if (y < getHeight()-n) + memcpy(pOut, pIn, getWidth()); + else + memclr(pOut, getWidth()); + + pIn -= getWidth(); + pOut -= getWidth(); + } + + return MICROBIT_OK; +} + + +/** + * Converts the bitmap to a csv ManagedString. + * + * @code + * const uint8_t heart[] = { 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, }; // a cute heart + * MicroBitImage i(10,5,heart); + * uBit.serial.printString(i.toString()); // "0,1,0,1,0,0,0,0,0,0\n..." + * @endcode + */ +ManagedString MicroBitImage::toString() +{ + //width including commans and \n * height + int stringSize = getSize() * 2; + + //plus one for string terminator + char parseBuffer[stringSize + 1]; + + parseBuffer[stringSize] = '\0'; + + uint8_t *bitmapPtr = getBitmap(); + + int parseIndex = 0; + int widthCount = 0; + + while (parseIndex < stringSize) + { + if(*bitmapPtr) + parseBuffer[parseIndex] = '1'; + else + parseBuffer[parseIndex] = '0'; + + parseIndex++; + + if(widthCount == getWidth()-1) + { + parseBuffer[parseIndex] = '\n'; + widthCount = 0; + } + else + { + parseBuffer[parseIndex] = ','; + widthCount++; + } + + parseIndex++; + bitmapPtr++; + } + + return ManagedString(parseBuffer); +} + +/** + * Crops the image to the given dimensions. + * + * @param startx the location to start the crop in the x-axis + * + * @param starty the location to start the crop in the y-axis + * + * @param width the width of the desired cropped region + * + * @param height the height of the desired cropped region + * + * @code + * const uint8_t heart[] = { 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, }; // a cute heart + * MicroBitImage i(10,5,heart); + * i.crop(0,0,2,2).toString() // "0,1\n1,1\n" + * @endcode + */ +MicroBitImage MicroBitImage::crop(int startx, int starty, int cropWidth, int cropHeight) +{ + int newWidth = startx + cropWidth; + int newHeight = starty + cropHeight; + + if (newWidth >= getWidth() || newWidth <=0) + newWidth = getWidth(); + + if (newHeight >= getHeight() || newHeight <= 0) + newHeight = getHeight(); + + //allocate our storage. + uint8_t cropped[newWidth * newHeight]; + + //calculate the pointer to where we want to begin cropping + uint8_t *copyPointer = getBitmap() + (getWidth() * starty) + startx; + + //get a reference to our storage + uint8_t *pastePointer = cropped; + + //go through row by row and select our image. + for (int i = starty; i < newHeight; i++) + { + memcpy(pastePointer, copyPointer, newWidth); + + copyPointer += getWidth(); + pastePointer += newHeight; + } + + return MicroBitImage(newWidth, newHeight, cropped); +} + +/** + * Check if image is read-only (i.e., residing in flash). + */ +bool MicroBitImage::isReadOnly() +{ + return ptr->isReadOnly(); +} + +/** + * Create a copy of the image bitmap. Used particularly, when isReadOnly() is true. + * + * @return an instance of MicroBitImage which can be modified independently of the current instance + */ +MicroBitImage MicroBitImage::clone() +{ + return MicroBitImage(getWidth(), getHeight(), getBitmap()); +}