start experimenting with 64bit frame-buffers
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1680523002
Review URL: https://codereview.chromium.org/1680523002
diff --git a/gm/xferu64.cpp b/gm/xferu64.cpp
new file mode 100644
index 0000000..03fc886
--- /dev/null
+++ b/gm/xferu64.cpp
@@ -0,0 +1,149 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gm.h"
+#include "SkCanvas.h"
+#include "SkImageInfo.h"
+#include "SkXfermode.h"
+#include "SkHalf.h"
+#include "SkImage.h"
+
+static SkPMColor f16_to_pmcolor(uint64_t src) {
+ SkPMColor dst;
+ const SkHalf* sptr = reinterpret_cast<const SkHalf*>(&src);
+ uint8_t* dptr = reinterpret_cast<uint8_t*>(&dst);
+ for (int i = 0; i < 4; ++i) {
+ float f = SkHalfToFloat(sptr[i]);
+ dptr[i] = SkToU8((int)(f * 255 + 0.5f));
+ }
+ return dst;
+}
+
+static SkPMColor u16_to_pmcolor(uint64_t src) {
+ SkPMColor dst;
+ const uint16_t* sptr = reinterpret_cast<const uint16_t*>(&src);
+ uint8_t* dptr = reinterpret_cast<uint8_t*>(&dst);
+ for (int i = 0; i < 4; ++i) {
+ dptr[i] = sptr[i] >> 8;
+ }
+ return dst;
+}
+
+static SkImage* new_u64_image(const SkBitmap& src, uint32_t flags) {
+ SkBitmap dst;
+ dst.allocN32Pixels(src.width(), src.height());
+ SkPixmap srcPM, dstPM;
+ src.peekPixels(&srcPM);
+ dst.peekPixels(&dstPM);
+
+ for (int y = 0; y < srcPM.height(); ++y) {
+ for (int x = 0; x < srcPM.width(); ++x) {
+ uint64_t srcP = *srcPM.addr64(x, y);
+ uint32_t* dstP = dstPM.writable_addr32(x, y);
+
+ if (flags & SkXfermode::kDstIsFloat16_U64Flag) {
+ *dstP = f16_to_pmcolor(srcP);
+ } else {
+ *dstP = u16_to_pmcolor(srcP);
+ }
+ }
+ }
+ return SkImage::NewRasterCopy(dstPM.info(), dstPM.addr(), dstPM.rowBytes());
+}
+
+static void draw_rect(SkCanvas* canvas, const SkRect& r, SkColor c, uint32_t u64_flags,
+ const SkAlpha aa[]) {
+ const SkIRect ir = r.round();
+ const SkImageInfo info = SkImageInfo::Make(ir.width(), ir.height(),
+ kRGBA_F16_SkColorType, kPremul_SkAlphaType);
+
+ SkBitmap bm;
+ bm.allocPixels(info);
+ SkPixmap pm;
+ bm.peekPixels(&pm);
+ memset(pm.writable_addr(), 0, pm.getSafeSize());
+
+ if (SkColorGetA(c) == 0xFF) {
+ u64_flags |= SkXfermode::kSrcIsOpaque_PM4fFlag;
+ }
+
+ const SkXfermode::U64State state { nullptr, u64_flags };
+
+ const SkPM4f src = SkColor4f::FromColor(c).premul();
+ auto proc1 = SkXfermode::GetU64Proc1(SkXfermode::kSrcOver_Mode, u64_flags);
+ for (int y = 0; y < ir.height()/2; ++y) {
+ proc1(state, pm.writable_addr64(0, y), src, ir.width(), aa);
+ }
+
+ SkPM4f buffer[1000];
+ for (int i = 0; i < ir.width(); ++i) {
+ buffer[i] = src;
+ }
+ auto procN = SkXfermode::GetU64ProcN(SkXfermode::kSrcOver_Mode, u64_flags);
+ for (int y = ir.height()/2 + 1; y < ir.height(); ++y) {
+ procN(state, pm.writable_addr64(0, y), buffer, ir.width(), aa);
+ }
+
+ SkAutoTUnref<SkImage> image(new_u64_image(bm, u64_flags));
+ canvas->drawImage(image, r.left(), r.top(), nullptr);
+}
+
+/*
+ * Test SkXfer4fProcs directly for src-over, comparing them to current SkColor blits.
+ */
+DEF_SIMPLE_GM(xfer_u64_srcover, canvas, 580, 760) {
+ const int IW = 50;
+ const SkScalar W = IW;
+ const SkScalar H = 100;
+
+ const int32_t flags[] = {
+ -1, // normal
+ 0, // U16 components
+ SkXfermode::kDstIsFloat16_U64Flag, // F16 components
+ };
+ const SkColor colors[] = {
+ SK_ColorBLACK, SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE,
+ 0x88000000, 0x88FF0000, 0x8800FF00, 0x880000FF
+ };
+
+ uint8_t aa_scanline[IW];
+ for (int i = 0; i < IW; ++i) {
+ aa_scanline[i] = i * 255 / (IW - 1);
+ }
+ uint8_t const* aa_table[] = { nullptr, aa_scanline };
+
+ SkBitmap mask;
+ mask.installPixels(SkImageInfo::MakeA8(IW, 1), aa_scanline, IW);
+
+ canvas->translate(20, 20);
+
+ const SkRect r = SkRect::MakeWH(W, H);
+ for (const uint8_t* aa : aa_table) {
+ canvas->save();
+ for (auto flag : flags) {
+ canvas->save();
+ for (SkColor c : colors) {
+ if (flag < 0) {
+ SkPaint p;
+ p.setColor(c);
+ if (aa) {
+ canvas->drawBitmapRect(mask, r, &p);
+ } else {
+ canvas->drawRect(r, p);
+ }
+ } else {
+ draw_rect(canvas, r, c, flag, aa);
+ }
+ canvas->translate(W + 20, 0);
+ }
+ canvas->restore();
+ canvas->translate(0, H + 20);
+ }
+ canvas->restore();
+ canvas->translate(0, (H + 20) * SK_ARRAY_COUNT(flags) + 20);
+ }
+}