Revert "change computeByteSize to return max_size_t on overflow"

This reverts commit 2429546272.

Reason for revert: broke running dm on google3

Original change's description:
> change computeByteSize to return max_size_t on overflow
> 
> Bug: skia:7132
> Change-Id: I41045640ee62b2c988a84370ead5034bbccc6daf
> Reviewed-on: https://skia-review.googlesource.com/56620
> Reviewed-by: Ben Wagner <bungeman@google.com>
> Commit-Queue: Mike Reed <reed@google.com>

TBR=bungeman@google.com,herb@google.com,reed@google.com

Change-Id: I5f58ec37241d2fae3ebdb7a3d6b41f9fd6d3c2ee
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:7132
Reviewed-on: https://skia-review.googlesource.com/56880
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>

include/core/SkImageInfo.h

@@ -317,19 +317,11 @@ public:
     }
 #endif
 
-#ifdef SK_SUPPORT_LEGACY_COMPUTEBYTESIZE_RET_0
     /**
      *  Returns the size (in bytes) of the image buffer that this info needs, given the specified
      *  rowBytes. The rowBytes must be >= this->minRowBytes().
      *  If the calculation overflows, or if the height is 0, this returns 0.
      */
-#else
-    /**
-     *  Returns the size (in bytes) of the image buffer that this info needs, given the specified
-     *  rowBytes. The rowBytes must be >= this->minRowBytes().
-     *  If the calculation overflows this returns SK_MaxSizeT
-     */
-#endif
     size_t computeByteSize(size_t rowBytes) const;
 
     /**

include/core/SkTypes.h

@@ -233,7 +233,6 @@ template <typename D, typename S> D SkTo(S s) {
 #define SK_MaxU32   0xFFFFFFFF
 #define SK_MinU32   0
 #define SK_NaN32    ((int) (1U << 31))
-#define SK_MaxSizeT SIZE_MAX
 
 static inline int32_t SkLeftShift(int32_t value, int32_t shift) {
     return (int32_t) ((uint32_t) value << shift);

public.bzl

@@ -656,7 +656,6 @@ DEFINES_ALL = [
     # Required for building dm.
     "GR_TEST_UTILS",
     # Staging flags for API changes
-    "SK_SUPPORT_LEGACY_COMPUTEBYTESIZE_RET_0",
     # Should remove after we update golden images
     "SK_WEBP_ENCODER_USE_DEFAULT_METHOD",
     # Experiment to diagnose image diffs in Google3

src/core/SkAutoPixmapStorage.cpp

@@ -37,7 +37,7 @@ bool SkAutoPixmapStorage::tryAlloc(const SkImageInfo& info) {
 
     size_t rb;
     size_t size = AllocSize(info, &rb);
-    if (SK_MaxSizeT == size) {
+    if (0 == size) {
         return false;
     }
     void* pixels = sk_malloc_flags(size, 0);

src/core/SkBitmapCache.cpp

@@ -290,7 +290,7 @@ SkBitmapCache::RecPtr SkBitmapCache::Alloc(const SkBitmapCacheDesc& desc, const
 
     const size_t rb = info.minRowBytes();
     size_t size = info.computeByteSize(rb);
-    if (SK_MaxSizeT == size) {
+    if (0 == size) {
         return nullptr;
     }
 

src/core/SkImageInfo.cpp

@@ -78,11 +78,7 @@ size_t SkImageInfo::computeByteSize(size_t rowBytes) const {
     SkSafeMath safe;
     size_t bytes = safe.add(safe.mul(fHeight - 1, rowBytes),
                             safe.mul(fWidth, this->bytesPerPixel()));
-#ifdef SK_SUPPORT_LEGACY_COMPUTEBYTESIZE_RET_0
     return safe ? bytes : 0;
-#else
-    return safe ? bytes : SK_MaxSizeT;
-#endif
 }
 
 static bool alpha_type_is_valid(SkAlphaType alphaType) {

src/core/SkMallocPixelRef.cpp

@@ -80,7 +80,7 @@ sk_sp<SkPixelRef> SkMallocPixelRef::MakeUsing(void*(*allocProc)(size_t),
     size_t size = 0;
     if (!info.isEmpty() && rowBytes) {
         size = info.computeByteSize(rowBytes);
-        if (size == SK_MaxSizeT) {
+        if (!size) {
             return nullptr; // overflow
         }
     }
@@ -131,6 +131,9 @@ sk_sp<SkPixelRef> SkMallocPixelRef::MakeWithData(const SkImageInfo& info,
     if (!is_valid(info)) {
         return nullptr;
     }
+    // TODO: what should we return if computeByteSize returns 0?
+    // - the info was empty?
+    // - we overflowed computing the size?
     if ((rowBytes < info.minRowBytes()) || (data->size() < info.computeByteSize(rowBytes))) {
         return nullptr;
     }

src/image/SkImage.cpp

@@ -423,7 +423,7 @@ sk_sp<SkImage> SkImageMakeRasterCopyAndAssignColorSpace(const SkImage* src,
 
     size_t rowBytes = info.minRowBytes();
     size_t size = info.computeByteSize(rowBytes);
-    if (size == SK_MaxSizeT) {
+    if (size == 0) {
         return nullptr;
     }
     auto data = SkData::MakeUninitialized(size);

src/image/SkImage_Raster.cpp

@@ -62,7 +62,7 @@ public:
         }
 
         size_t size = info.computeByteSize(rowBytes);
-        if (SK_MaxSizeT == size) {
+        if (0 == size) {
             return false;
         }