add skiamge (in tools/) that decodes and encodes images
git-svn-id: http://skia.googlecode.com/svn/trunk@160 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/skimage_main.cpp b/tools/skimage_main.cpp
new file mode 100644
index 0000000..575078c
--- /dev/null
+++ b/tools/skimage_main.cpp
@@ -0,0 +1,107 @@
+#include "SkBitmap.h"
+#include "SkGraphics.h"
+#include "SkImageDecoder.h"
+#include "SkImageEncoder.h"
+#include "SkStream.h"
+#include "SkTemplates.h"
+
+static bool decodeFile(SkBitmap* bitmap, const char srcPath[]) {
+ SkFILEStream stream(srcPath);
+ if (!stream.isValid()) {
+ SkDebugf("ERROR: bad filename <%s>\n", srcPath);
+ return false;
+ }
+
+ SkImageDecoder* codec = SkImageDecoder::Factory(&stream);
+ if (NULL == codec) {
+ SkDebugf("ERROR: no codec found for <%s>\n", srcPath);
+ return false;
+ }
+
+ SkAutoTDelete<SkImageDecoder> ad(codec);
+
+ stream.rewind();
+ if (!codec->decode(&stream, bitmap, SkBitmap::kARGB_8888_Config,
+ SkImageDecoder::kDecodePixels_Mode)) {
+ SkDebugf("ERROR: codec failed for <%s>\n", srcPath);
+ return false;
+ }
+ return true;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+class SkAutoGraphics {
+public:
+ SkAutoGraphics() {
+ SkGraphics::Init();
+ }
+ ~SkAutoGraphics() {
+ SkGraphics::Term();
+ }
+};
+
+static void show_help() {
+ SkDebugf("usage: skiamge [-o out-dir] inputfiles...\n");
+}
+
+static void make_outname(SkString* dst, const char outDir[], const char src[]) {
+ dst->set(outDir);
+ const char* start = strrchr(src, '/');
+ if (start) {
+ start += 1; // skip the actual last '/'
+ } else {
+ start = src;
+ }
+ dst->append(start);
+ dst->append(".png");
+}
+
+int main (int argc, char * const argv[]) {
+ SkAutoGraphics ag;
+ int i, outDirIndex = 0;
+ SkString outDir;
+
+ for (i = 1; i < argc; i++) {
+ if (!strcmp(argv[i], "-help")) {
+ show_help();
+ return 0;
+ }
+ if (!strcmp(argv[i], "-o")) {
+ if (i == argc-1) {
+ SkDebugf("ERROR: -o needs a following filename\n");
+ return -1;
+ }
+ outDirIndex = i;
+ outDir.set(argv[i+1]);
+ if (outDir.c_str()[outDir.size() - 1] != '/') {
+ outDir.append("/");
+ }
+ i += 1; // skip the out dir name
+ }
+ }
+
+ for (i = 1; i < argc; i++) {
+ if (i == outDirIndex) {
+ i += 1; // skip this and the next entry
+ continue;
+ }
+
+ SkBitmap bitmap;
+ if (decodeFile(&bitmap, argv[i])) {
+ if (outDirIndex) {
+ SkString outPath;
+ make_outname(&outPath, outDir.c_str(), argv[i]);
+ SkDebugf(" writing %s\n", outPath.c_str());
+ SkImageEncoder::EncodeFile(outPath.c_str(), bitmap,
+ SkImageEncoder::kPNG_Type, 100);
+ } else {
+ SkDebugf(" decoded %s [%d %d]\n", argv[i], bitmap.width(),
+ bitmap.height());
+ }
+ }
+ }
+
+ return 0;
+}
+