Added FileReaderApp to experimental and it's corresponding gyp file
git-svn-id: http://skia.googlecode.com/svn/trunk@1641 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/FileReaderApp/ReaderView.cpp b/experimental/FileReaderApp/ReaderView.cpp
new file mode 100644
index 0000000..efdc7be
--- /dev/null
+++ b/experimental/FileReaderApp/ReaderView.cpp
@@ -0,0 +1,68 @@
+#include "ReaderView.h"
+#include "SkGPipe.h"
+#include "SkCanvas.h"
+
+#include <stdio.h>
+
+#define FILE_PATH "/Users/yangsu/Code/test/test.a"
+ReaderView::ReaderView() {
+ fBGColor = 0xFFDDDDDD;
+ fFilePos = 0;
+ fBufferBitmaps[0].setConfig(SkBitmap::kARGB_8888_Config, 640, 480);
+ fBufferBitmaps[0].allocPixels(NULL);
+ fBufferBitmaps[1].setConfig(SkBitmap::kARGB_8888_Config, 640, 480);
+ fBufferBitmaps[1].allocPixels(NULL);
+ fFront = 0;
+ fBack = 1;
+}
+
+void ReaderView::draw(SkCanvas* canvas) {
+ canvas->drawColor(fBGColor);
+
+ SkAutoCanvasRestore acr(canvas, true);
+
+ //Create a temporary canvas and reader object that draws into the back
+ //bitmap so that the incremental changes or incomplete reads are not shown
+ //on screen
+ SkCanvas bufferCanvas(fBufferBitmaps[fBack]);
+ SkGPipeReader reader(&bufferCanvas);
+
+ //The file specified by FILE_PATH MUST exist
+ FILE* f = fopen(FILE_PATH, "rb");
+ SkASSERT(f != NULL);
+
+ fseek(f, 0, SEEK_END);
+ int size = ftell(f) * sizeof(char);
+ if (size <= fFilePos) {
+ fFilePos = 0;
+ }
+
+ //Resume from the last read location
+ fseek(f, fFilePos, SEEK_SET);
+ int toBeRead = size - fFilePos;
+ if (size > 0 && toBeRead > 0) {
+ void* block = sk_malloc_throw(toBeRead);
+ fread(block, 1, toBeRead, f);
+
+ size_t bytesRead;
+ SkGPipeReader::Status fStatus = reader.playback(block, toBeRead, &bytesRead);
+ SkASSERT(SkGPipeReader::kError_Status != fStatus);
+ SkASSERT(toBeRead >= bytesRead);
+
+ //if the reader reaches a done verb, a frame is complete.
+ //Update the file location and swap the front and back bitmaps to show
+ //the new frame
+ if (SkGPipeReader::kDone_Status == fStatus) {
+ fFilePos += bytesRead;
+ fFront = fFront ^ 0x1;
+ fBack = fBack ^ 0x1;
+ }
+ sk_free(block);
+ }
+
+ fclose(f);
+
+ //the front bitmap is always drawn
+ canvas->drawBitmap(fBufferBitmaps[fFront], 0, 0, NULL);
+ this->inval(NULL);
+}
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