png to rle conversion in pynthon + Test touch screen

Author: mstrens

python-png_to_rle/README.md

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+# python-rle
+Convert a PNG file into a human-readable RLE format by using Python 3 and Pillow.
+
+<h3>If you don't have Pillow installed</h3>
+Run the following command from the command prompt:
+<pre>pip install pillow</pre>
+
+<h3>What is RLE</h3>
+According to Wikipedia, RLE stands for "Run-length encoding (RLE)". <br/><br/>
+Run-length encoding is a very simple form of lossless data compression in which runs of data (that is, sequences in which the same data value occurs in many consecutive data elements) are stored as a single data value and count, rather than as the original run.
+<br/><br/>
+<i>For example, this string:</i><br/>
+WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW<br/><br/>
+<i>...becomes this after using RLE:</i><br/>
+12W1B12W3B24W1B14W<br/><br/>
+This script simply converts a binary PNG image into an RLE-type file format.
+<h3>Example</h3>
+<i>Original image</i><br/>
+<img src="https://github.com/anwserman/python-rle/blob/master/input/golfcourse.png">
+<i>Sample output</i><br/>
+<pre>
+#Image Dimensions
+Width: 683 
+Height: 384 
+
+
+#Image Palette
+255, 0, 128
+0, 102, 0
+0, 255, 0
+66, 255, 66
+0, 0, 255
+255, 255, 0
+128, 128, 128
+0, 0, 0
+
+#Pixel Count
+0: 42670
+1: 48
+0: 631
+1: 53
+0: 627
+1: 61
+0: 55
+2: 55
+0: 509
+1: 67
+0: 48
+2: 63
+
+... truncated for brevity
+</pre>
+<h3>Included commands</h3>
+<b>open_png(filename):</b> Open up a PNG file by file path, and read it into memory<br/>
+<b>get_color_atpoint(point):</b> Get a tuple with RGB values at a given point in an image, by passing in a tuple with X,Y coordinates<br/>
+<b>read_rle_fromstream(stream):</b> Read in RLE information from a file, by passing in a file stream <br/>
+<b>write_memory_tofile(filename):</b> Write out the image in memory as a binary file <br/>
+<b>write_rle_tostream(filename):</b> Write out RLE information to a file, by passing in a file stream<br/>

python-png_to_rle/more1_button_48pixels.png

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+import os, sys
+from PIL import Image
+
+class RLEBitmap:
+    width = 0
+    height = 0
+    pixels = None
+    image = None
+    
+    #basic constructor
+    def __init__(self):
+        self.image = None
+        self.pixels = None
+        self.height = 0
+        self.width = 0
+    
+    def open_png(self, filename):
+        #open up the image
+        self.image = Image.open(filename)
+        #get the pixel data
+        self.pixels = self.image.load()
+        #get the width and height 
+        self.width, self.height = self.image.size
+        print ("width=",self.width)
+        print ("height=",self.height)
+    
+    def get_color_atpoint(self, point):
+        #return the pixel color as a tuple, at the given point
+        return (self.pixels[point[0], point[1]])
+    
+    #read an image from a file stream
+    def read_rle_fromstream(self, stream):
+        #colors used within the image, this can be a list and not a dictionary
+        colors = []
+        colorCount = 0
+        colorIndex = 0
+        
+        #iterator data
+        i = 0
+        x = 0
+        y = 0
+        
+        #reset bitmap data
+        self.image = None
+        self.pixels = None
+        
+        #read in and skip the first line, it's the header description
+        
+        self.line1 = stream.readline()
+        print("line1=", self.line1)
+        #get the image width and height
+        self.line2 = stream.readline()
+        print("line2=", self.line2)
+        self.width = int(self.line2.split(':')[1])
+        self.height = int(stream.readline().split(':')[1])
+        #skip the new line
+        stream.readline()
+        
+        #set up our bitmap in memory
+        self.image = Image.new("RGB", (self.width, self.height))
+        
+        #read in the image palette, and skip the first line as it's the palette description
+        stream.readline()
+        
+        #interate through until we hit whitespace
+        sI = stream.readline()
+        while not sI.isspace():
+            #split the line into rgb components
+            sISplit = sI.split(',')
+            #read in the values as an RGB tuple 
+            colors.append((int(sISplit[0]), int(sISplit[1]), int(sISplit[2])))
+            #read in the next new line
+            sI = stream.readline()
+        
+        #now we read in the pixel count, and skip the first line as it's the header description
+        stream.readline()
+        
+        #iterate through until we hit whitespae
+        #first line
+        sI = stream.readline()
+        while not sI.isspace():
+            #split the line into index/count components
+            sISplit = sI.split(':')
+            #get the RGB index value that we need based on index
+            colorIndex = int(sISplit[0])
+            #get the count of how many times we need to loop through this color
+            colorCount = int(sISplit[1])
+            
+            i = 0
+            for i in range(0, colorCount):
+                self.image.putpixel((x, y), colors[colorIndex])
+                x += 1
+                
+                if (x == (self.width)):
+                    x = 0
+                    y += 1
+                    
+            #read in the next new line    
+            sI = stream.readline()
+        
+        #once the image has been constructed in memory, dump the pixel data into a table
+        self.pixels = self.image.load()
+        
+    #print rle conversion
+    def write_rle_tostream(self):
+        #colors used within the image
+        colors = {}
+        #store the RLE data
+        pixels = []
+        pixelsTFE = [] # this is the format required by TFTe_SPI
+        #store the color in use
+        currentColor = None
+        currentColorCount = 0
+        
+        #iterator data
+        x = 0
+        y = 0
+        
+        #iterate through image
+        #row by row
+        for y in range(0, self.height):
+            #column by column
+            for x in range(0, self.width):
+                #get the current pixel
+                newColor = self.pixels[x, y] 
+
+                #compare new color versus existing color
+                if newColor != currentColor:
+                    #we don't want to do this if currentColor is nothing
+                    if currentColor != None:
+                        #add current (existing) color to our dictionary
+                        #and give it an index value (lookup value)
+                        #this is rudimentary lookup table for both saving the color data below and for saving/reading the file later
+                        colors.setdefault(currentColor, len(colors.keys()))
+                        #return the index value
+                        colorIndex = colors[currentColor]
+                        #add the color and pixel count to our list
+                        pixels.append((colorIndex, currentColorCount))
+                        while currentColorCount > 128:
+                            if currentColor == 0:
+                                pixelsTFE.append(127)
+                            else :     
+                                pixelsTFE.append(255)
+                            currentColorCount = currentColorCount - 128    
+                        if currentColor != 0:
+                                currentColorCount = currentColorCount+128
+                        pixelsTFE.append(currentColorCount-1)
+                        #set the new color to our currentcolor 
+                        currentColor = newColor
+                        #set the count equal to 1, as we need to count it as part of the new run
+                        currentColorCount = 1
+                    else:
+                        currentColor = newColor
+                        currentColorCount = 1   
+                else:
+                    currentColorCount += 1
+                
+        #flush out the last of the colors we were working on, into the array
+        colors.setdefault(currentColor, len(colors.keys()))
+        colorIndex = colors[currentColor]
+        pixels.append((colorIndex, currentColorCount))
+        while currentColorCount > 128:
+            if currentColor == 0:
+                pixelsTFE.append(127)
+            else :     
+                pixelsTFE.append(255)
+            currentColorCount = currentColorCount - 128
+        if currentColor != 0:
+                currentColorCount = currentColorCount+128
+        pixelsTFE.append(currentColorCount-1)
+                   
+        print("colors =", colors)
+        print("pixels (on/off , amount) =" , pixels)
+        print("rle = " ,pixelsTFE)
+    
+#some tests
+#open up a PNG and write it to a RLE document
+rb = RLEBitmap()
+#rb.open_png('input\golfcourse.png')
+rb.open_png('more1_button.png')
+#fs = open('output\more1_button.rle','w')
+#fs = open('output\golfcourse.rle','w')
+rb.write_rle_tostream()
+#fs.close()

python-png_to_rle/more1_button_96pixels.png

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+
+#include "SPI.h"
+
+#define TFT_MISO 19
+#define TFT_MOSI 23
+#define TFT_SCLK 18
+#define TFT_CS   13 //15  // Chip select control pin
+#define TFT_DC   14// 2  // Data Command control pin
+
+#define TFT_RST  12// 4  // Reset pin (could connect to RST pin)
+
+//#define TFT_RST  -1  // Set TFT_RST to -1 if display RESET is connected to ESP32 board RST
+#define TOUCH_CS 27 //21     // Chip select pin (T_CS) of touch screen
+
+#define TFT_LED_PIN 25 
+
+
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("\n\nStarting...");
+
+  
+  pinMode(TFT_DC, OUTPUT);
+  digitalWrite(TFT_DC, HIGH); // Data/Command high = data mode
+
+ pinMode(TFT_RST, OUTPUT);
+ digitalWrite(TFT_RST, HIGH); // Set high, do not share pin with another SPI device
+  
+  pinMode(TFT_LED_PIN , OUTPUT) ;
+  digitalWrite(TFT_LED_PIN , HIGH) ;
+    
+  
+  SPI.begin(TFT_SCLK, TFT_MISO, TFT_MOSI, -1);
+  Serial.println("\n\nEnd of setup...");
+  //SPI.endTransaction();  
+
+  tft.begin();
+
+  tft.setRotation(1);
+  tft.fillScreen(TFT_NAVY); // Clear screen to navy background
+
+}
+
+void readOneAxis(uint8_t axis){
+  uint16_t data ;
+  //Serial.print("1");
+  SPI.endTransaction();
+  SPI.beginTransaction(SPISettings(2500000, MSBFIRST, SPI_MODE0));
+  //Serial.print("2");
+  digitalWrite( TOUCH_CS, LOW) ; // select the device
+  //pinMode(TFT_RST, INPUT  );
+  SPI.transfer(axis);
+  //Serial.print("3"); 
+  data = SPI.transfer16(axis) ;
+  //Serial.print("4");
+  Serial.print(" "); Serial.print(data);
+  digitalWrite( TOUCH_CS, HIGH) ; // select the device
+  SPI.endTransaction();
+  //Serial.print("5");
+  
+}
+#define X_AXIS 0xD3
+#define Y_AXIS 0x93
+#define Z_AXIS 0xB1
+
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  readOneAxis(X_AXIS);
+  readOneAxis(Y_AXIS);
+  readOneAxis(Z_AXIS);
+  Serial.println("");
+  //delay(500); 
+}