Mike Reed | ef8ce28 | 2017-10-05 16:04:41 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #include "SkCoreBlitters.h" |
| 9 | #include "SkColorData.h" |
| 10 | #include "SkShader.h" |
Hal Canary | ea60b95 | 2018-08-21 11:45:46 -0400 | [diff] [blame] | 11 | #include "SkUTF.h" |
Mike Reed | ef8ce28 | 2017-10-05 16:04:41 -0400 | [diff] [blame] | 12 | #include "SkXfermodePriv.h" |
Mike Reed | ef8ce28 | 2017-10-05 16:04:41 -0400 | [diff] [blame] | 13 | #include "SkColorData.h" |
| 14 | |
| 15 | #include "SkNx.h" |
| 16 | |
| 17 | static void D16_S32X_src(uint16_t dst[], const SkPMColor src[], int count, uint8_t coverage) { |
| 18 | SkASSERT(coverage == 0xFF); |
| 19 | for (int i = 0; i < count; ++i) { |
| 20 | dst[i] = SkPixel32ToPixel16(src[i]); |
| 21 | } |
| 22 | } |
| 23 | |
| 24 | static void D16_S32X_src_coverage(uint16_t dst[], const SkPMColor src[], int count, |
| 25 | uint8_t coverage) { |
| 26 | switch (coverage) { |
| 27 | case 0: break; |
| 28 | case 0xFF: |
| 29 | for (int i = 0; i < count; ++i) { |
| 30 | dst[i] = SkPixel32ToPixel16(src[i]); |
| 31 | } |
| 32 | break; |
| 33 | default: |
| 34 | unsigned scale = coverage + (coverage >> 7); |
| 35 | for (int i = 0; i < count; ++i) { |
| 36 | dst[i] = SkSrcOver32To16(SkAlphaMulQ(src[i], scale), dst[i]); |
| 37 | } |
| 38 | break; |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | static void D16_S32A_srcover(uint16_t dst[], const SkPMColor src[], int count, uint8_t coverage) { |
| 43 | SkASSERT(coverage == 0xFF); |
| 44 | for (int i = 0; i < count; ++i) { |
| 45 | dst[i] = SkSrcOver32To16(src[i], dst[i]); |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | static void D16_S32A_srcover_coverage(uint16_t dst[], const SkPMColor src[], int count, |
| 50 | uint8_t coverage) { |
| 51 | switch (coverage) { |
| 52 | case 0: break; |
| 53 | case 0xFF: |
| 54 | for (int i = 0; i < count; ++i) { |
| 55 | dst[i] = SkSrcOver32To16(src[i], dst[i]); |
| 56 | } |
| 57 | break; |
| 58 | default: |
| 59 | unsigned scale = coverage + (coverage >> 7); |
| 60 | for (int i = 0; i < count; ++i) { |
| 61 | dst[i] = SkSrcOver32To16(SkAlphaMulQ(src[i], scale), dst[i]); |
| 62 | } |
| 63 | break; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | bool SkRGB565_Shader_Blitter::Supports(const SkPixmap& device, const SkPaint& paint) { |
| 68 | if (device.colorType() != kRGB_565_SkColorType) { |
| 69 | return false; |
| 70 | } |
| 71 | if (device.colorSpace()) { |
| 72 | return false; |
| 73 | } |
| 74 | if (paint.getBlendMode() != SkBlendMode::kSrcOver && |
| 75 | paint.getBlendMode() != SkBlendMode::kSrc) { |
| 76 | return false; |
| 77 | } |
Mike Reed | ef8ce28 | 2017-10-05 16:04:41 -0400 | [diff] [blame] | 78 | if (paint.isDither()) { |
| 79 | return false; |
| 80 | } |
| 81 | return true; |
| 82 | } |
| 83 | |
| 84 | SkRGB565_Shader_Blitter::SkRGB565_Shader_Blitter(const SkPixmap& device, |
| 85 | const SkPaint& paint, SkShaderBase::Context* shaderContext) |
| 86 | : INHERITED(device, paint, shaderContext) |
| 87 | { |
| 88 | SkASSERT(shaderContext); |
| 89 | SkASSERT(Supports(device, paint)); |
| 90 | |
| 91 | fBuffer = (SkPMColor*)sk_malloc_throw(device.width() * (sizeof(SkPMColor))); |
| 92 | |
| 93 | bool isOpaque = SkToBool(shaderContext->getFlags() & SkShaderBase::kOpaqueAlpha_Flag); |
| 94 | |
| 95 | if (paint.getBlendMode() == SkBlendMode::kSrc || isOpaque) { |
| 96 | fBlend = D16_S32X_src; |
| 97 | fBlendCoverage = D16_S32X_src_coverage; |
| 98 | } else { // srcover |
| 99 | fBlend = isOpaque ? D16_S32X_src : D16_S32A_srcover; |
| 100 | fBlendCoverage = isOpaque ? D16_S32X_src_coverage : D16_S32A_srcover_coverage; |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | SkRGB565_Shader_Blitter::~SkRGB565_Shader_Blitter() { |
| 105 | sk_free(fBuffer); |
| 106 | } |
| 107 | |
| 108 | void SkRGB565_Shader_Blitter::blitH(int x, int y, int width) { |
| 109 | SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width()); |
| 110 | |
| 111 | uint16_t* device = fDevice.writable_addr16(x, y); |
| 112 | |
| 113 | SkPMColor* span = fBuffer; |
| 114 | fShaderContext->shadeSpan(x, y, span, width); |
| 115 | fBlend(device, span, width, 0xFF); |
| 116 | } |
| 117 | |
| 118 | void SkRGB565_Shader_Blitter::blitAntiH(int x, int y, const SkAlpha coverage[], |
| 119 | const int16_t runs[]) { |
| 120 | SkPMColor* span = fBuffer; |
| 121 | uint16_t* device = fDevice.writable_addr16(x, y); |
| 122 | auto* shaderContext = fShaderContext; |
| 123 | |
| 124 | for (;;) { |
| 125 | int count = *runs; |
| 126 | if (count <= 0) { |
| 127 | break; |
| 128 | } |
| 129 | int aa = *coverage; |
| 130 | if (aa) { |
| 131 | shaderContext->shadeSpan(x, y, span, count); |
| 132 | fBlendCoverage(device, span, count, aa); |
| 133 | } |
| 134 | device += count; |
| 135 | runs += count; |
| 136 | coverage += count; |
| 137 | x += count; |
| 138 | } |
| 139 | } |