initial commit

2026-02-12 00:45:31 -08:00
commit 5f168f370b
3024 changed files with 804889 additions and 0 deletions
--- a/libraries/PNGdec/examples/png_benchmark/png_benchmark.ino
+++ b/libraries/PNGdec/examples/png_benchmark/png_benchmark.ino
@@ -0,0 +1,102 @@
+//
+// PNG decoder benchmark
+//
+// Runs images through the PNG decoder without displaying the pixels
+// to measure the execution time on various Arduino boards
+//
+#include <PNGdec.h>
+#include "octocat_4bpp.h"
+#include "octocat_8bpp.h"
+#include "octocat_32bpp.h"
+
+PNG png; // statically allocate the PNG structure (about 50K of RAM)
+
+// simple private structure to pass a boolean value to the PNGDRAW callback
+typedef struct myprivate
+{
+  bool bConvert;
+} PRIVATE;
+
+int PNGDraw(PNGDRAW *pDraw)
+{
+PRIVATE *pPriv = (PRIVATE *)pDraw->pUser;
+uint16_t usPixels[320];
+
+  if (pPriv->bConvert)
+     png.getLineAsRGB565(pDraw, usPixels, PNG_RGB565_LITTLE_ENDIAN, 0xffffffff); // don't do alpha color blending
+  return 1;
+} /* PNGDraw() */
+
+void setup() {
+  Serial.begin(115200);
+  delay(2000);
+  Serial.println("Starting benchmark...");
+} /* setup() */
+
+void loop() {
+long lTime;
+char szTemp[256];
+int rc;
+PRIVATE priv;
+
+// 32-bpp image
+    rc = png.openFLASH((uint8_t *)octocat_32bpp, sizeof(octocat_32bpp), PNGDraw);
+    if (rc == PNG_SUCCESS) {
+        Serial.println("Successfully opened octocat_32bpp.png");
+        priv.bConvert = false;
+        lTime = micros();
+        rc = png.decode((void *)&priv, PNG_FAST_PALETTE);
+        if (rc == PNG_SUCCESS) {
+          lTime = micros() - lTime;
+          sprintf(szTemp, "Decode time for native pixels = %d us\n", (int)lTime);
+          Serial.print(szTemp);
+        } else {
+          Serial.print("Decode error: "); Serial.println(rc, DEC);
+        }
+        priv.bConvert = true;
+        lTime = micros();
+        rc = png.decode((void *)&priv, PNG_FAST_PALETTE);
+        lTime = micros() - lTime;
+        sprintf(szTemp, "Decode time for RGB565 pixels = %d us\n", (int)lTime);
+        Serial.print(szTemp); 
+        png.close(); // not needed for memory->memory decode
+    }
+
+// 8-bpp image
+    rc = png.openFLASH((uint8_t *)octocat_8bpp, sizeof(octocat_8bpp), PNGDraw);
+    if (rc == PNG_SUCCESS) {
+        Serial.println("Successfully opened octocat_8bpp.png");
+        priv.bConvert = false;
+        lTime = micros();
+        rc = png.decode((void *)&priv, PNG_FAST_PALETTE);
+        lTime = micros() - lTime;
+        sprintf(szTemp, "Decode time for native pixels = %d us\n", (int)lTime);
+        Serial.print(szTemp);
+        priv.bConvert = true;
+        lTime = micros();
+        rc = png.decode((void *)&priv, PNG_FAST_PALETTE);
+        lTime = micros() - lTime;
+        sprintf(szTemp, "Decode time for RGB565 pixels = %d us\n", (int)lTime);
+        Serial.print(szTemp);
+        png.close(); // not needed for memory->memory decode
+    }
+// 4-bpp image
+    rc = png.openFLASH((uint8_t *)octocat_4bpp, sizeof(octocat_4bpp), PNGDraw);
+    if (rc == PNG_SUCCESS) {
+        Serial.println("Successfully opened octocat_4bpp.png");
+        priv.bConvert = false;
+        lTime = micros();
+        rc = png.decode((void *)&priv, PNG_FAST_PALETTE);
+        lTime = micros() - lTime;
+        sprintf(szTemp, "Decode time for native pixels = %d us\n", (int)lTime);
+        Serial.print(szTemp);
+        priv.bConvert = true;
+        lTime = micros();
+        rc = png.decode((void *)&priv, PNG_FAST_PALETTE);
+        lTime = micros() - lTime;
+        sprintf(szTemp, "Decode time for RGB565 pixels = %d us\n", (int)lTime);
+        Serial.print(szTemp); 
+        png.close(); // not needed for memory->memory decode
+    }
+  delay(5000);
+} /* loop() */