initial commit

libraries/PNGdec/linux/main.cpp

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+//
+//  main.cpp
+//  pngdec_test
+//
+//  Created by Larry Bank on 5/9/21.
+//
+
+#include "../src/PNGdec.h"
+
+PNG png; // static instance of class
+
+/* Windows BMP header info (54 bytes) */
+uint8_t winbmphdr[54] =
+        {0x42,0x4d,
+         0,0,0,0,         /* File size */
+         0,0,0,0,0x36,4,0,0,0x28,0,0,0,
+         0,0,0,0, /* Xsize */
+         0,0,0,0, /* Ysize */
+         1,0,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,       /* number of planes, bits per pel */
+         0,0,0,0};
+
+//
+// Minimal code to save frames as Windows BMP files
+//
+void SaveBMP(char *fname, uint8_t *pBitmap, uint8_t *pPalette, int cx, int cy, int bpp)
+{
+FILE * oHandle;
+int i, bsize, lsize;
+uint32_t *l;
+uint8_t *s;
+uint8_t ucTemp[1024];
+
+    oHandle = fopen(fname, "w+b");
+    bsize = (cx * bpp) >> 3;
+    lsize = (bsize + 3) & 0xfffc; /* Width of each line */
+    winbmphdr[26] = 1; // number of planes
+    winbmphdr[28] = (uint8_t)bpp;
+
+   /* Write the BMP header */
+   l = (uint32_t *)&winbmphdr[2];
+    i =(cy * lsize) + 54;
+    if (bpp <= 8)
+        i += 1024;
+   *l = (uint32_t)i; /* Store the file size */
+   l = (uint32_t *)&winbmphdr[10]; // pointer to data
+    *l = i - (cy * lsize);
+    winbmphdr[14] = 0x28;
+   l = (uint32_t *)&winbmphdr[18];
+   *l = (uint32_t)cx;      /* width */
+   *(l+1) = (uint32_t)(-cy);  /* height */
+   fwrite(winbmphdr, 1, 54, oHandle);
+    if (bpp <= 8) {
+    if (pPalette == NULL) {// create a grayscale palette
+        int iDelta, iCount = 1<<bpp;
+        int iGray = 0;
+        iDelta = 255/(iCount-1);
+        for (i=0; i<iCount; i++) {
+            ucTemp[i*4+0] = (uint8_t)iGray;
+            ucTemp[i*4+1] = (uint8_t)iGray;
+            ucTemp[i*4+2] = (uint8_t)iGray;
+            ucTemp[i*4+3] = 0;
+            iGray += iDelta;
+        }
+    } else {
+        for (i=0; i<256; i++) // change palette to WinBMP format
+        {
+            ucTemp[i*4 + 0] = pPalette[(i*3)+2];
+            ucTemp[i*4 + 1] = pPalette[(i*3)+1];
+            ucTemp[i*4 + 2] = pPalette[(i*3)+0];
+            ucTemp[i*4 + 3] = 0;
+        }
+    }
+    fwrite(ucTemp, 1, 1024, oHandle);
+    }
+   /* Write the image data */
+   for (i=0; i<cy; i++)
+    {
+        s = &pBitmap[i*bsize];
+        if (bpp >= 24) { // swap R/B for Windows BMP byte order
+            uint8_t ucTemp[2048];
+            int j, iBpp = bpp/8;
+            uint8_t *d = ucTemp;
+            for (j=0; j<cx; j++) {
+                d[0] = s[2]; d[1] = s[1]; d[2] = s[0];
+                d += iBpp; s += iBpp;
+            }
+            fwrite(ucTemp, 1, (size_t)lsize, oHandle);
+        } else {
+            fwrite(s, 1, (size_t)lsize, oHandle);
+        }
+    }
+   fclose(oHandle);
+} /* SaveBMP() */
+
+void PNGDraw(PNGDRAW *pDraw)
+{
+    uint16_t usPixels[320];
+      png.getLineAsRGB565(pDraw, usPixels, PNG_RGB565_LITTLE_ENDIAN, 0xffffffff);
+}
+int main(int argc, const char * argv[]) {
+    int i, rc;
+    uint8_t *pData;
+    int iDataSize;
+    FILE *ihandle;
+    uint8_t *pPalette;
+    
+    if (argc != 3) {
+       printf("Usage: png_demo <infile.png> <outfile.bmp>\n");
+       return 0;
+    }
+    ihandle = fopen(argv[1],"rb"); // open input file
+    if (ihandle == NULL)
+    {
+        fprintf(stderr, "Unable to open file: %s\n", argv[1]);
+        return -1; // bad filename passed
+    }
+    fseek(ihandle, 0L, SEEK_END); // get the file size
+    iDataSize = (int)ftell(ihandle);
+    fseek(ihandle, 0, SEEK_SET);
+    pData = (uint8_t *)malloc(iDataSize);
+    fread(pData, 1, iDataSize, ihandle);
+    fclose(ihandle);
+    
+//    for (int j=0; j<10000; j++) {
+        rc = png.openRAM(pData, iDataSize, NULL); //PNGDraw);
+    if (rc == PNG_SUCCESS) {
+        printf("image specs: (%d x %d), %d bpp, pixel type: %d\n", png.getWidth(), png.getHeight(), png.getBpp(), png.getPixelType());
+        png.setBuffer((uint8_t *)malloc(png.getBufferSize()));
+        rc = png.decode(NULL, 0); //PNG_CHECK_CRC);
+        printf("decode returned: %d\n", rc);
+        i = 1;
+        pPalette = NULL;
+        switch (png.getPixelType()) {
+            case PNG_PIXEL_INDEXED:
+                pPalette = png.getPalette();
+                i = 1;
+                break;
+            case PNG_PIXEL_TRUECOLOR:
+                i = 3;
+                break;
+            case PNG_PIXEL_TRUECOLOR_ALPHA:
+                i = 4;
+                break;
+        }
+        SaveBMP((char *)argv[2], png.getBuffer(), pPalette, png.getWidth(), png.getHeight(), i*png.getBpp());
+        png.close();
+        free(png.getBuffer());
+//    } // for j
+    }
+    return 0;
+}