зеркало из https://github.com/mozilla/moz-skia.git
75 строки
2.2 KiB
C++
75 строки
2.2 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "ReaderView.h"
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#include "SkGPipe.h"
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#include "SkCanvas.h"
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#include <stdio.h>
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#define FILE_PATH "/Users/yangsu/Code/test/test.a"
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ReaderView::ReaderView() {
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fBGColor = 0xFFDDDDDD;
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fFilePos = 0;
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fBufferBitmaps[0].setConfig(SkBitmap::kARGB_8888_Config, 640, 480);
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fBufferBitmaps[0].allocPixels(NULL);
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fBufferBitmaps[1].setConfig(SkBitmap::kARGB_8888_Config, 640, 480);
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fBufferBitmaps[1].allocPixels(NULL);
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fFront = 0;
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fBack = 1;
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}
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void ReaderView::draw(SkCanvas* canvas) {
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canvas->drawColor(fBGColor);
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SkAutoCanvasRestore acr(canvas, true);
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//Create a temporary canvas and reader object that draws into the back
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//bitmap so that the incremental changes or incomplete reads are not shown
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//on screen
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SkCanvas bufferCanvas(fBufferBitmaps[fBack]);
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SkGPipeReader reader(&bufferCanvas);
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//The file specified by FILE_PATH MUST exist
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FILE* f = fopen(FILE_PATH, "rb");
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SkASSERT(f != NULL);
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fseek(f, 0, SEEK_END);
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int size = ftell(f) * sizeof(char);
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if (size <= fFilePos) {
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fFilePos = 0;
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}
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//Resume from the last read location
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fseek(f, fFilePos, SEEK_SET);
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int toBeRead = size - fFilePos;
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if (size > 0 && toBeRead > 0) {
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void* block = sk_malloc_throw(toBeRead);
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fread(block, 1, toBeRead, f);
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size_t bytesRead;
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SkGPipeReader::Status fStatus = reader.playback(block, toBeRead, &bytesRead);
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SkASSERT(SkGPipeReader::kError_Status != fStatus);
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SkASSERT(toBeRead >= bytesRead);
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//if the reader reaches a done verb, a frame is complete.
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//Update the file location and swap the front and back bitmaps to show
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//the new frame
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if (SkGPipeReader::kDone_Status == fStatus) {
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fFilePos += bytesRead;
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fFront = fFront ^ 0x1;
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fBack = fBack ^ 0x1;
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}
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sk_free(block);
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}
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fclose(f);
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//the front bitmap is always drawn
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canvas->drawBitmap(fBufferBitmaps[fFront], 0, 0, NULL);
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this->inval(NULL);
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} |