1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "ImGuiLayer.h"
#include "SkCanvas.h"
#include "SkImage.h"
#include "SkPixmap.h"
#include "SkSwizzle.h"
#include "SkVertices.h"
#include "imgui.h"
#include <stdlib.h>
#include <map>
using namespace sk_app;
ImGuiLayer::ImGuiLayer() {
// ImGui initialization:
ImGuiIO& io = ImGui::GetIO();
// Keymap...
io.KeyMap[ImGuiKey_Tab] = (int)Window::Key::kTab;
io.KeyMap[ImGuiKey_LeftArrow] = (int)Window::Key::kLeft;
io.KeyMap[ImGuiKey_RightArrow] = (int)Window::Key::kRight;
io.KeyMap[ImGuiKey_UpArrow] = (int)Window::Key::kUp;
io.KeyMap[ImGuiKey_DownArrow] = (int)Window::Key::kDown;
io.KeyMap[ImGuiKey_PageUp] = (int)Window::Key::kPageUp;
io.KeyMap[ImGuiKey_PageDown] = (int)Window::Key::kPageDown;
io.KeyMap[ImGuiKey_Home] = (int)Window::Key::kHome;
io.KeyMap[ImGuiKey_End] = (int)Window::Key::kEnd;
io.KeyMap[ImGuiKey_Delete] = (int)Window::Key::kDelete;
io.KeyMap[ImGuiKey_Backspace] = (int)Window::Key::kBack;
io.KeyMap[ImGuiKey_Enter] = (int)Window::Key::kOK;
io.KeyMap[ImGuiKey_Escape] = (int)Window::Key::kEscape;
io.KeyMap[ImGuiKey_A] = (int)Window::Key::kA;
io.KeyMap[ImGuiKey_C] = (int)Window::Key::kC;
io.KeyMap[ImGuiKey_V] = (int)Window::Key::kV;
io.KeyMap[ImGuiKey_X] = (int)Window::Key::kX;
io.KeyMap[ImGuiKey_Y] = (int)Window::Key::kY;
io.KeyMap[ImGuiKey_Z] = (int)Window::Key::kZ;
int w, h;
unsigned char* pixels;
io.Fonts->GetTexDataAsAlpha8(&pixels, &w, &h);
SkImageInfo info = SkImageInfo::MakeA8(w, h);
SkPixmap pmap(info, pixels, info.minRowBytes());
SkMatrix localMatrix = SkMatrix::MakeScale(1.0f / w, 1.0f / h);
auto fontImage = SkImage::MakeFromRaster(pmap, nullptr, nullptr);
auto fontShader = fontImage->makeShader(&localMatrix);
fFontPaint.setShader(fontShader);
fFontPaint.setColor(SK_ColorWHITE);
fFontPaint.setFilterQuality(kLow_SkFilterQuality);
io.Fonts->TexID = &fFontPaint;
}
void ImGuiLayer::onAttach(Window* window) {
fWindow = window;
}
bool ImGuiLayer::onMouse(int x, int y, Window::InputState state, uint32_t modifiers) {
ImGuiIO& io = ImGui::GetIO();
io.MousePos.x = static_cast<float>(x);
io.MousePos.y = static_cast<float>(y);
if (Window::kDown_InputState == state) {
io.MouseDown[0] = true;
} else if (Window::kUp_InputState == state) {
io.MouseDown[0] = false;
}
return io.WantCaptureMouse;
}
bool ImGuiLayer::onMouseWheel(float delta, uint32_t modifiers) {
ImGuiIO& io = ImGui::GetIO();
io.MouseWheel += delta;
return true;
}
void ImGuiLayer::skiaWidget(const ImVec2& size, SkiaWidgetFunc func) {
intptr_t funcIndex = fSkiaWidgetFuncs.count();
fSkiaWidgetFuncs.push_back(func);
ImGui::Image((ImTextureID)funcIndex, size);
}
void ImGuiLayer::onPrePaint() {
// Update ImGui input
ImGuiIO& io = ImGui::GetIO();
io.DeltaTime = 1.0f / 60.0f;
io.DisplaySize.x = static_cast<float>(fWindow->width());
io.DisplaySize.y = static_cast<float>(fWindow->height());
io.KeyAlt = io.KeysDown[static_cast<int>(Window::Key::kOption)];
io.KeyCtrl = io.KeysDown[static_cast<int>(Window::Key::kCtrl)];
io.KeyShift = io.KeysDown[static_cast<int>(Window::Key::kShift)];
ImGui::NewFrame();
}
void ImGuiLayer::onPaint(SkCanvas* canvas) {
// This causes ImGui to rebuild vertex/index data based on all immediate-mode commands
// (widgets, etc...) that have been issued
ImGui::Render();
// Then we fetch the most recent data, and convert it so we can render with Skia
const ImDrawData* drawData = ImGui::GetDrawData();
SkTDArray<SkPoint> pos;
SkTDArray<SkPoint> uv;
SkTDArray<SkColor> color;
for (int i = 0; i < drawData->CmdListsCount; ++i) {
const ImDrawList* drawList = drawData->CmdLists[i];
// De-interleave all vertex data (sigh), convert to Skia types
pos.rewind(); uv.rewind(); color.rewind();
for (int i = 0; i < drawList->VtxBuffer.size(); ++i) {
const ImDrawVert& vert = drawList->VtxBuffer[i];
pos.push(SkPoint::Make(vert.pos.x, vert.pos.y));
uv.push(SkPoint::Make(vert.uv.x, vert.uv.y));
color.push(vert.col);
}
// ImGui colors are RGBA
SkSwapRB(color.begin(), color.begin(), color.count());
int indexOffset = 0;
// Draw everything with canvas.drawVertices...
for (int j = 0; j < drawList->CmdBuffer.size(); ++j) {
const ImDrawCmd* drawCmd = &drawList->CmdBuffer[j];
SkAutoCanvasRestore acr(canvas, true);
// TODO: Find min/max index for each draw, so we know how many vertices (sigh)
if (drawCmd->UserCallback) {
drawCmd->UserCallback(drawList, drawCmd);
} else {
intptr_t idIndex = (intptr_t)drawCmd->TextureId;
if (idIndex < fSkiaWidgetFuncs.count()) {
// Small image IDs are actually indices into a list of callbacks. We directly
// examing the vertex data to deduce the image rectangle, then reconfigure the
// canvas to be clipped and translated so that the callback code gets to use
// Skia to render a widget in the middle of an ImGui panel.
ImDrawIdx rectIndex = drawList->IdxBuffer[indexOffset];
SkPoint tl = pos[rectIndex], br = pos[rectIndex + 2];
canvas->clipRect(SkRect::MakeLTRB(tl.fX, tl.fY, br.fX, br.fY));
canvas->translate(tl.fX, tl.fY);
fSkiaWidgetFuncs[idIndex](canvas);
} else {
SkPaint* paint = static_cast<SkPaint*>(drawCmd->TextureId);
SkASSERT(paint);
canvas->clipRect(SkRect::MakeLTRB(drawCmd->ClipRect.x, drawCmd->ClipRect.y,
drawCmd->ClipRect.z, drawCmd->ClipRect.w));
auto vertices = SkVertices::MakeCopy(SkVertices::kTriangles_VertexMode,
drawList->VtxBuffer.size(),
pos.begin(), uv.begin(), color.begin(),
drawCmd->ElemCount,
drawList->IdxBuffer.begin() + indexOffset);
canvas->drawVertices(vertices, SkBlendMode::kModulate, *paint);
indexOffset += drawCmd->ElemCount;
}
}
}
}
fSkiaWidgetFuncs.reset();
}
bool ImGuiLayer::onKey(sk_app::Window::Key key, sk_app::Window::InputState state, uint32_t modifiers) {
ImGuiIO& io = ImGui::GetIO();
io.KeysDown[static_cast<int>(key)] = (Window::kDown_InputState == state);
return io.WantCaptureKeyboard;
}
bool ImGuiLayer::onChar(SkUnichar c, uint32_t modifiers) {
ImGuiIO& io = ImGui::GetIO();
if (io.WantTextInput) {
if (c > 0 && c < 0x10000) {
io.AddInputCharacter(c);
}
return true;
}
return false;
}
|
