1 files changed, 147 insertions, 0 deletions
diff --git a/src/images/SkImageDecoder_libbmp.cpp b/src/images/SkImageDecoder_libbmp.cpp
new file mode 100644
index 0000000000..32a7a6de42
--- /dev/null
+++ b/src/images/SkImageDecoder_libbmp.cpp
@@ -0,0 +1,147 @@
+/*
+ * Copyright 2007, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); 
+ * you may not use this file except in compliance with the License. 
+ * You may obtain a copy of the License at 
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0 
+ *
+ * Unless required by applicable law or agreed to in writing, software 
+ * distributed under the License is distributed on an "AS IS" BASIS, 
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+ * See the License for the specific language governing permissions and 
+ * limitations under the License.
+ */
+ 
+#include "bmpdecoderhelper.h"
+#include "SkImageDecoder.h"
+#include "SkScaledBitmapSampler.h"
+#include "SkStream.h"
+#include "SkColorPriv.h"
+#include "SkTDArray.h"
+
+class SkBMPImageDecoder : public SkImageDecoder {
+public:
+    SkBMPImageDecoder() {}
+    
+    virtual Format getFormat() const {
+        return kBMP_Format;
+    }
+
+protected:
+    virtual bool onDecode(SkStream* stream, SkBitmap* bm,
+                          SkBitmap::Config pref, Mode mode);
+};
+
+SkImageDecoder* SkImageDecoder_BMP_Factory(SkStream*);
+SkImageDecoder* SkImageDecoder_BMP_Factory(SkStream* stream) {
+    static const char kBmpMagic[] = { 'B', 'M' };
+    
+    size_t len = stream->getLength();
+    char buffer[sizeof(kBmpMagic)];
+    
+    if (len > sizeof(kBmpMagic) &&
+            stream->read(buffer, sizeof(kBmpMagic)) == sizeof(kBmpMagic) &&
+            !memcmp(buffer, kBmpMagic, sizeof(kBmpMagic))) {
+        return SkNEW(SkBMPImageDecoder);
+    }
+    return NULL;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+class SkBmpDecoderCallback : public image_codec::BmpDecoderCallback {
+public:
+    // we don't copy the bitmap, just remember the pointer
+    SkBmpDecoderCallback(bool justBounds) : fJustBounds(justBounds) {}
+
+    // override from BmpDecoderCallback
+    virtual uint8* SetSize(int width, int height) {
+        fWidth = width;
+        fHeight = height;
+        if (fJustBounds) {
+            return NULL;
+        }
+        
+        fRGB.setCount(width * height * 3);  // 3 == r, g, b
+        return fRGB.begin();
+    }
+
+    int width() const { return fWidth; }
+    int height() const { return fHeight; }
+    uint8_t* rgb() const { return fRGB.begin(); }
+
+private:
+    SkTDArray<uint8_t> fRGB;
+    int fWidth;
+    int fHeight;
+    bool fJustBounds;
+};
+
+bool SkBMPImageDecoder::onDecode(SkStream* stream, SkBitmap* bm,
+                                 SkBitmap::Config prefConfig, Mode mode) {
+
+    size_t length = stream->getLength();
+    SkAutoMalloc storage(length);
+    
+    if (stream->read(storage.get(), length) != length) {
+        return false;
+    }
+    
+    const bool justBounds = SkImageDecoder::kDecodeBounds_Mode == mode;
+    SkBmpDecoderCallback callback(justBounds);
+
+    // Now decode the BMP into callback's rgb() array [r,g,b, r,g,b, ...]
+    {
+        image_codec::BmpDecoderHelper helper;
+        const int max_pixels = 16383*16383; // max width*height
+        if (!helper.DecodeImage((const char*)storage.get(), length,
+                                max_pixels, &callback)) {
+            return false;
+        }
+    }
+    
+    // we don't need this anymore, so free it now (before we try to allocate
+    // the bitmap's pixels) rather than waiting for its destructor
+    storage.free();
+    
+    int width = callback.width();
+    int height = callback.height();
+    SkBitmap::Config config = SkBitmap::kARGB_8888_Config;
+    
+    // only accept prefConfig if it makes sense for us
+    if (SkBitmap::kARGB_4444_Config == prefConfig ||
+            SkBitmap::kRGB_565_Config == config) {
+        config = prefConfig;
+    }
+
+    SkScaledBitmapSampler sampler(width, height, getSampleSize());
+
+    bm->setConfig(config, sampler.scaledWidth(), sampler.scaledHeight());
+    bm->setIsOpaque(true);
+    if (justBounds) {
+        return true;
+    }
+
+    if (!this->allocPixelRef(bm, NULL)) {
+        return false;
+    }
+    
+    SkAutoLockPixels alp(*bm);
+    
+    if (!sampler.begin(bm, SkScaledBitmapSampler::kRGB, getDitherImage())) {
+        return false;
+    }
+
+    const int srcRowBytes = width * 3;
+    const int dstHeight = sampler.scaledHeight();
+    const uint8_t* srcRow = callback.rgb();
+    
+    srcRow += sampler.srcY0() * srcRowBytes;
+    for (int y = 0; y < dstHeight; y++) {
+        sampler.next(srcRow);
+        srcRow += sampler.srcDY() * srcRowBytes;
+    }
+    return true;
+}