Move calls to conversion_possible to SkCodec

Move common code into the base class, so subclasses need not call
conversion_possible.

Use SkEncodedInfo rather than SkImageInfo, and use the proper frame.

API Changes:
- SkAndroidCodec:
  - Add getEncodedInfo(), for SkBitmapRegionCodec
- SkEncodedInfo:
  - Add opaque() helper
- SkBitmapRegionDecoder:
  - Remove unused conversionSupported

(Split off from skia-review.googlesource.com/c/25746)

Bug: skia:5601
Change-Id: If4a40d4b98a3dd0afde2b6058f92315a393a5baf
Reviewed-on: https://skia-review.googlesource.com/34361
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>

1 files changed, 5 insertions, 10 deletions

diff --git a/src/codec/SkWbmpCodec.cpp b/src/codec/SkWbmpCodec.cpp
index 934d7d5b9a..bc796c4fcc 100644
--- a/src/codec/SkWbmpCodec.cpp
+++ b/src/codec/SkWbmpCodec.cpp
@@ -108,6 +108,11 @@ SkEncodedImageFormat SkWbmpCodec::onGetEncodedFormat() const {
     return SkEncodedImageFormat::kWBMP;
 }
 
+bool SkWbmpCodec::conversionSupported(const SkImageInfo& dst, SkEncodedInfo::Color srcColor,
+                                      bool srcIsOpaque, const SkColorSpace* srcCS) const {
+    return valid_color_type(dst) && valid_alpha(dst.alphaType(), srcIsOpaque);
+}
+
 SkCodec::Result SkWbmpCodec::onGetPixels(const SkImageInfo& info,
                                          void* dst,
                                          size_t rowBytes,
@@ -118,10 +123,6 @@ SkCodec::Result SkWbmpCodec::onGetPixels(const SkImageInfo& info,
         return kUnimplemented;
     }
 
-    if (!valid_color_type(info) || !valid_alpha(info.alphaType(), this->getInfo().alphaType())) {
-        return kInvalidConversion;
-    }
-
     // Initialize the swizzler
     std::unique_ptr<SkSwizzler> swizzler(this->initializeSwizzler(info, options));
     SkASSERT(swizzler);
@@ -186,12 +187,6 @@ SkCodec::Result SkWbmpCodec::onStartScanlineDecode(const SkImageInfo& dstInfo,
         return kUnimplemented;
     }
 
-    if (!valid_color_type(dstInfo) ||
-        !valid_alpha(dstInfo.alphaType(), this->getInfo().alphaType()))
-    {
-        return kInvalidConversion;
-    }
-
     // Initialize the swizzler
     fSwizzler.reset(this->initializeSwizzler(dstInfo, options));
     SkASSERT(fSwizzler);