| // Copyright 2019 Google LLC. |
| // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. |
| #include "tools/fiddle/examples.h" |
| // HASH=dd81527bbdf5eaae7dd21ac04ab84f9e |
| REG_FIDDLE(Color_Type_RGBA_F16, 256, 96, false, 0) { |
| union FloatUIntUnion { |
| uint32_t fUInt; |
| float fFloat; |
| }; |
| uint16_t FloatToHalf(float f) { |
| static const FloatUIntUnion magic = { 15 << 23 }; |
| static const uint32_t round_mask = ~0xfffu; |
| FloatUIntUnion floatUnion; |
| floatUnion.fFloat = f; |
| uint32_t sign = floatUnion.fUInt & 0x80000000u; |
| floatUnion.fUInt ^= sign; |
| floatUnion.fUInt &= round_mask; |
| floatUnion.fFloat *= magic.fFloat; |
| floatUnion.fUInt -= round_mask; |
| return (floatUnion.fUInt >> 13) | (sign >> 16); |
| } |
| |
| void draw(SkCanvas* canvas) { |
| canvas->scale(16, 16); |
| SkBitmap bitmap; |
| SkImageInfo imageInfo = SkImageInfo::Make(2, 2, kRGBA_F16_SkColorType, kPremul_SkAlphaType); |
| bitmap.allocPixels(imageInfo); |
| SkCanvas offscreen(bitmap); |
| offscreen.clear(SK_ColorGREEN); |
| canvas->drawBitmap(bitmap, 0, 0); |
| auto H = [](float c) -> uint16_t { |
| return FloatToHalf(c); |
| }; |
| // R G B A |
| uint16_t red_f16[][4] = { { H(1.0), H(0.0), H(0.0), H(1.0) }, |
| { H(.75), H(0.0), H(0.0), H(1.0) }, |
| { H(.50), H(0.0), H(0.0), H(1.0) }, |
| { H(.25), H(0.0), H(0.0), H(1.0) } }; |
| uint16_t blue_f16[][4] = { { H(0.0), H(0.0), H(1.0), H(1.0) }, |
| { H(0.0), H(0.0), H(.75), H(1.0) }, |
| { H(0.0), H(0.0), H(.50), H(1.0) }, |
| { H(0.0), H(0.0), H(.25), H(1.0) } }; |
| SkPixmap redPixmap(imageInfo, red_f16, imageInfo.minRowBytes()); |
| if (bitmap.writePixels(redPixmap, 0, 0)) { |
| canvas->drawBitmap(bitmap, 2, 2); |
| } |
| SkPixmap bluePixmap(imageInfo, blue_f16, imageInfo.minRowBytes()); |
| if (bitmap.writePixels(bluePixmap, 0, 0)) { |
| canvas->drawBitmap(bitmap, 4, 4); |
| } |
| } |
| } // END FIDDLE |