Initial commit

Change-Id: I4712afb3912625e7aaccfa5160dcf78ee252f159

examples/dwebp.c

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+// Copyright 2010 Google Inc.
+//
+// This code is licensed under the same terms as WebM:
+//  Software License Agreement:  http://www.webmproject.org/license/software/
+//  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
+// -----------------------------------------------------------------------------
+//
+//  simple command-line example calling libwebpdecode to
+//  decode a WebP image into a PPM image.
+//
+//  Compile with:     gcc -o dwebp dwebp.c -lwebpdecode
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "webp/decode.h"
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+//-----------------------------------------------------------------------------
+
+static void help(const char *s) {
+  printf("Usage: dwebp "
+         "[options] [in_file] [-h] [-yuv] [-o ppm_file]\n");
+}
+
+int main(int argc, char *argv[]) {
+  const char *in_file = NULL;
+  const char *out_file = NULL;
+  int yuv_out = 0;
+
+  int c;
+  for (c = 1; c < argc; ++c) {
+    if (!strcmp(argv[c], "-h")) {
+      help(argv[0]);
+      return 0;
+    } else if (!strcmp(argv[c], "-o") && c < argc - 1) {
+      out_file = argv[++c];
+    } else if (!strcmp(argv[c], "-yuv")) {
+      yuv_out = 1;
+    } else if (argv[c][0] == '-') {
+      printf("Unknown option '%s'\n", argv[c]);
+      help(argv[0]);
+      return -1;
+    } else {
+      in_file = argv[c];
+    }
+  }
+
+  if (in_file == NULL) {
+    printf("missing input file!!\n");
+    help(argv[0]);
+    return -1;
+  }
+
+  uint32_t data_size = 0;
+  void* data = NULL;
+  {
+    FILE* const in = fopen(in_file, "rb");
+    if (!in) {
+      printf("cannot open input file '%s'\n", in_file);
+      return 1;
+    }
+    fseek(in, 0, SEEK_END);
+    data_size = ftell(in);
+    fseek(in, 0, SEEK_SET);
+    data = malloc(data_size);
+    const int ok = (fread(data, data_size, 1, in) == 1);
+    fclose(in);
+    if (!ok) {
+      free(data);
+      return -1;
+    }
+  }
+
+  int width, height, stride, uv_stride;
+  uint8_t* out = NULL, *u = NULL, *v = NULL;
+  if (!yuv_out) {
+    out = WebPDecodeRGB(data, data_size, &width, &height);
+  } else {
+    out = WebPDecodeYUV(data, data_size, &width, &height,
+                        &u, &v, &stride, &uv_stride);
+  }
+  free(data);
+
+  if (!out) {
+    printf("Decoding of %s failed.\n", in_file);
+    return -1;
+  }
+
+  if (out_file) {
+    FILE* const fout = fopen(out_file, "wb");
+    if (fout) {
+      if (!yuv_out) {
+        fprintf(fout, "P6\n%d %d\n255\n", width, height);
+        fwrite(out, width * height, 3, fout);
+      } else {
+        int y;
+        fprintf(fout, "P5\n%d %d\n255\n", width, height * 3 / 2);
+        for (y = 0; y < height; ++y) {
+          fwrite(out + y * stride, width, 1, fout);
+        }
+        for (y = 0; y < (height + 1) / 2; ++y) {
+          fwrite(u + y * uv_stride, (width + 1) / 2, 1, fout);
+        }
+        for (y = 0; y < (height + 1) / 2; ++y) {
+          fwrite(v + y * uv_stride, (width + 1) / 2, 1, fout);
+        }
+      }
+      fclose(fout);
+      printf("Saved file %s\n", out_file);
+    } else {
+      printf("Error opening output file %s\n", out_file);
+    }
+  }
+  printf("Decoded %s. Dimensions: %d x %d.\n", in_file, width, height);
+  free(out);
+
+  return 0;
+}
+
+//-----------------------------------------------------------------------------
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}    // extern "C"
+#endif