Reland "Remove support for decoding to kIndex_8"

Original change's description:
> > Remove support for decoding to kIndex_8
> > 
> > Fix up callsites, and remove tests that no longer make sense.
> > 
> > Bug: skia:6828
> > Change-Id: I2548c4b7528b7b1be7412563156f27b52c9d4295
> > Reviewed-on: https://skia-review.googlesource.com/21664
> > Reviewed-by: Derek Sollenberger <djsollen@google.com>
> > Commit-Queue: Leon Scroggins <scroggo@google.com>
> 
> TBR=djsollen@google.com,scroggo@google.com
> 
> Change-Id: I1bc669441f250690884e75a9a61427fdf75c6907
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: skia:6828
> Reviewed-on: https://skia-review.googlesource.com/22120
> Reviewed-by: Leon Scroggins <scroggo@google.com>
> Commit-Queue: Leon Scroggins <scroggo@google.com>

TBR=djsollen@google.com,scroggo@google.com

Bug: skia:6828
Change-Id: I36ff5a11c529d29e8adc95f43b8edc6fd1dbf5b8
Reviewed-on: https://skia-review.googlesource.com/22320
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>

1 files changed, 5 insertions, 16 deletions

diff --git a/src/codec/SkBmpRLECodec.cpp b/src/codec/SkBmpRLECodec.cpp
index c6d788b800..0fcd290add 100644
--- a/src/codec/SkBmpRLECodec.cpp
+++ b/src/codec/SkBmpRLECodec.cpp
@@ -34,15 +34,13 @@ SkBmpRLECodec::SkBmpRLECodec(int width, int height, const SkEncodedInfo& info, S
 SkCodec::Result SkBmpRLECodec::onGetPixels(const SkImageInfo& dstInfo,
                                            void* dst, size_t dstRowBytes,
                                            const Options& opts,
-                                           SkPMColor* inputColorPtr,
-                                           int* inputColorCount,
                                            int* rowsDecoded) {
     if (opts.fSubset) {
         // Subsets are not supported.
         return kUnimplemented;
     }
 
-    Result result = this->prepareToDecode(dstInfo, opts, inputColorPtr, inputColorCount);
+    Result result = this->prepareToDecode(dstInfo, opts);
     if (kSuccess != result) {
         return result;
     }
@@ -63,19 +61,13 @@ SkCodec::Result SkBmpRLECodec::onGetPixels(const SkImageInfo& dstInfo,
 /*
  * Process the color table for the bmp input
  */
- bool SkBmpRLECodec::createColorTable(SkColorType dstColorType, int* numColors) {
+ bool SkBmpRLECodec::createColorTable(SkColorType dstColorType) {
     // Allocate memory for color table
     uint32_t colorBytes = 0;
     SkPMColor colorTable[256];
     if (this->bitsPerPixel() <= 8) {
         // Inform the caller of the number of colors
         uint32_t maxColors = 1 << this->bitsPerPixel();
-        if (nullptr != numColors) {
-            // We set the number of colors to maxColors in order to ensure
-            // safe memory accesses.  Otherwise, an invalid pixel could
-            // access memory outside of our color table array.
-            *numColors = maxColors;
-        }
         // Don't bother reading more than maxColors.
         const uint32_t numColorsToRead =
             fNumColors == 0 ? maxColors : SkTMin(fNumColors, maxColors);
@@ -241,7 +233,7 @@ void SkBmpRLECodec::setRGBPixel(void* dst, size_t dstRowBytes,
 }
 
 SkCodec::Result SkBmpRLECodec::onPrepareToDecode(const SkImageInfo& dstInfo,
-        const SkCodec::Options& options, SkPMColor inputColorPtr[], int* inputColorCount) {
+        const SkCodec::Options& options) {
     // FIXME: Support subsets for scanline decodes.
     if (options.fSubset) {
         // Subsets are not supported.
@@ -256,20 +248,17 @@ SkCodec::Result SkBmpRLECodec::onPrepareToDecode(const SkImageInfo& dstInfo,
     SkColorType colorTableColorType = dstInfo.colorType();
     if (this->colorXform()) {
         // Just set a known colorType for the colorTable.  No need to actually transform
-        // the colors in the colorTable since we do not allow decoding RLE to kIndex8.
+        // the colors in the colorTable.
         colorTableColorType = kBGRA_8888_SkColorType;
     }
 
     // Create the color table if necessary and prepare the stream for decode
     // Note that if it is non-NULL, inputColorCount will be modified
-    if (!this->createColorTable(colorTableColorType, inputColorCount)) {
+    if (!this->createColorTable(colorTableColorType)) {
         SkCodecPrintf("Error: could not create color table.\n");
         return SkCodec::kInvalidInput;
     }
 
-    // Copy the color table to the client if necessary
-    copy_color_table(dstInfo, fColorTable.get(), inputColorPtr, inputColorCount);
-
     // Initialize a buffer for encoded RLE data
     if (!this->initializeStreamBuffer()) {
         SkCodecPrintf("Error: cannot initialize stream buffer.\n");