add skiamge (in tools/) that decodes and encodes images

git-svn-id: http://skia.googlecode.com/svn/trunk@160 2bbb7eff-a529-9590-31e7-b0007b416f81

Makefile

@@ -123,6 +123,19 @@ tests: $(TESTS_OBJS) out/libskia.a
 	
 ##############################################################################
 
+SKIMAGE_SRCS := skimage_main.cpp
+
+SKIMAGE_SRCS := $(addprefix tools/, $(SKIMAGE_SRCS))
+
+SKIMAGE_OBJS := $(SKIMAGE_SRCS:.cpp=.o)
+SKIMAGE_OBJS := $(addprefix out/, $(SKIMAGE_OBJS))
+
+skimage: $(SKIMAGE_OBJS) out/libskia.a
+	@echo "linking skimage..."
+	$(HIDE)g++ $(SKIMAGE_OBJS) out/libskia.a -o out/tools/skimage $(LINKER_OPTS)
+
+##############################################################################
+
 .PHONY: clean
 clean:
 	$(HIDE)rm -rf out
@@ -132,6 +145,7 @@ help:
 	@echo "Targets:"
 	@echo "    <default>: out/libskia.a"
 	@echo "    bench: out/bench/bench"
+	@echo "    skimage: out/tools/skimage"
 	@echo "    tests: out/tests/tests"
 	@echo "    clean: removes entire out/ directory"
 	@echo "    help: this text"

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;
+}
+