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Unified Diff: src/images/SkImageDecoder_pkm.cpp

Issue 1830943002: Revert of Delete SkImageDecoder (Closed) Base URL: https://skia.googlesource.com/skia.git@fix-animator
Patch Set: Created 4 years, 9 months ago
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Index: src/images/SkImageDecoder_pkm.cpp
diff --git a/src/images/SkImageDecoder_pkm.cpp b/src/images/SkImageDecoder_pkm.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..af68f20d9775fea69a11ff7d85f096d7c2de6361
--- /dev/null
+++ b/src/images/SkImageDecoder_pkm.cpp
@@ -0,0 +1,128 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkColorPriv.h"
+#include "SkData.h"
+#include "SkImageDecoder.h"
+#include "SkScaledBitmapSampler.h"
+#include "SkStream.h"
+#include "SkStreamPriv.h"
+#include "SkTextureCompressor.h"
+#include "SkTypes.h"
+
+#include "etc1.h"
+
+class SkPKMImageDecoder : public SkImageDecoder {
+public:
+ SkPKMImageDecoder() { }
+
+ Format getFormat() const override {
+ return kPKM_Format;
+ }
+
+protected:
+ Result onDecode(SkStream* stream, SkBitmap* bm, Mode) override;
+
+private:
+ typedef SkImageDecoder INHERITED;
+};
+
+/////////////////////////////////////////////////////////////////////////////////////////
+
+SkImageDecoder::Result SkPKMImageDecoder::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
+ sk_sp<SkData> data(SkCopyStreamToData(stream));
+ if (!data || !data->size()) {
+ return kFailure;
+ }
+
+ unsigned char* buf = (unsigned char*) data->data();
+
+ // Make sure original PKM header is there...
+ SkASSERT(etc1_pkm_is_valid(buf));
+
+ const unsigned short width = etc1_pkm_get_width(buf);
+ const unsigned short height = etc1_pkm_get_height(buf);
+
+ // Setup the sampler...
+ SkScaledBitmapSampler sampler(width, height, this->getSampleSize());
+
+ // Set the config...
+ bm->setInfo(SkImageInfo::MakeN32(sampler.scaledWidth(), sampler.scaledHeight(),
+ kOpaque_SkAlphaType));
+ if (SkImageDecoder::kDecodeBounds_Mode == mode) {
+ return kSuccess;
+ }
+
+ if (!this->allocPixelRef(bm, nullptr)) {
+ return kFailure;
+ }
+
+ // Lock the pixels, since we're about to write to them...
+ SkAutoLockPixels alp(*bm);
+
+ if (!sampler.begin(bm, SkScaledBitmapSampler::kRGB, *this)) {
+ return kFailure;
+ }
+
+ // Advance buffer past the header
+ buf += ETC_PKM_HEADER_SIZE;
+
+ // ETC1 Data is encoded as RGB pixels, so we should extract it as such
+ int nPixels = width * height;
+ SkAutoMalloc outRGBData(nPixels * 3);
+ uint8_t *outRGBDataPtr = reinterpret_cast<uint8_t *>(outRGBData.get());
+
+ // Decode ETC1
+ if (!SkTextureCompressor::DecompressBufferFromFormat(
+ outRGBDataPtr, width*3, buf, width, height, SkTextureCompressor::kETC1_Format)) {
+ return kFailure;
+ }
+
+ // Set each of the pixels...
+ const int srcRowBytes = width * 3;
+ const int dstHeight = sampler.scaledHeight();
+ const uint8_t *srcRow = reinterpret_cast<uint8_t *>(outRGBDataPtr);
+ srcRow += sampler.srcY0() * srcRowBytes;
+ for (int y = 0; y < dstHeight; ++y) {
+ sampler.next(srcRow);
+ srcRow += sampler.srcDY() * srcRowBytes;
+ }
+
+ return kSuccess;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////
+DEFINE_DECODER_CREATOR(PKMImageDecoder);
+/////////////////////////////////////////////////////////////////////////////////////////
+
+static bool is_pkm(SkStreamRewindable* stream) {
+ // Read the PKM header and make sure it's valid.
+ unsigned char buf[ETC_PKM_HEADER_SIZE];
+ if (stream->read((void*)buf, ETC_PKM_HEADER_SIZE) != ETC_PKM_HEADER_SIZE) {
+ return false;
+ }
+
+ return SkToBool(etc1_pkm_is_valid(buf));
+}
+
+static SkImageDecoder* sk_libpkm_dfactory(SkStreamRewindable* stream) {
+ if (is_pkm(stream)) {
+ return new SkPKMImageDecoder;
+ }
+ return nullptr;
+}
+
+static SkImageDecoder_DecodeReg gReg(sk_libpkm_dfactory);
+
+static SkImageDecoder::Format get_format_pkm(SkStreamRewindable* stream) {
+ if (is_pkm(stream)) {
+ return SkImageDecoder::kPKM_Format;
+ }
+ return SkImageDecoder::kUnknown_Format;
+}
+
+static SkImageDecoder_FormatReg gFormatReg(get_format_pkm);
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