[Telemetry] Add SurfaceFlingerStats to timeline_based_measurement
[chromium-blink-merge.git] / pdf / draw_utils.cc
blobd38be52aef92da58839ab5c29f64138c7d95d415
1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "pdf/draw_utils.h"
7 #include <algorithm>
8 #include <math.h>
9 #include <vector>
11 #include "base/logging.h"
12 #include "base/numerics/safe_math.h"
14 namespace chrome_pdf {
16 inline uint8 GetBlue(const uint32& pixel) {
17 return static_cast<uint8>(pixel & 0xFF);
20 inline uint8 GetGreen(const uint32& pixel) {
21 return static_cast<uint8>((pixel >> 8) & 0xFF);
24 inline uint8 GetRed(const uint32& pixel) {
25 return static_cast<uint8>((pixel >> 16) & 0xFF);
28 inline uint8 GetAlpha(const uint32& pixel) {
29 return static_cast<uint8>((pixel >> 24) & 0xFF);
32 inline uint32_t MakePixel(uint8 red, uint8 green, uint8 blue, uint8 alpha) {
33 return (static_cast<uint32_t>(alpha) << 24) |
34 (static_cast<uint32_t>(red) << 16) |
35 (static_cast<uint32_t>(green) << 8) |
36 static_cast<uint32_t>(blue);
39 inline uint8 GradientChannel(uint8 start, uint8 end, double ratio) {
40 double new_channel = start - (static_cast<double>(start) - end) * ratio;
41 if (new_channel < 0)
42 return 0;
43 if (new_channel > 255)
44 return 255;
45 return static_cast<uint8>(new_channel + 0.5);
48 inline uint8 ProcessColor(uint8 src_color, uint8 dest_color, uint8 alpha) {
49 uint32 processed = static_cast<uint32>(src_color) * alpha +
50 static_cast<uint32>(dest_color) * (0xFF - alpha);
51 return static_cast<uint8>((processed / 0xFF) & 0xFF);
54 inline bool ImageDataContainsRect(const pp::ImageData& image_data,
55 const pp::Rect& rect) {
56 return rect.width() >= 0 && rect.height() >= 0 &&
57 pp::Rect(image_data.size()).Contains(rect);
60 void AlphaBlend(const pp::ImageData& src, const pp::Rect& src_rc,
61 pp::ImageData* dest, const pp::Point& dest_origin,
62 uint8 alpha_adjustment) {
63 if (src_rc.IsEmpty() || !ImageDataContainsRect(src, src_rc))
64 return;
66 pp::Rect dest_rc(dest_origin, src_rc.size());
67 if (dest_rc.IsEmpty() || !ImageDataContainsRect(*dest, dest_rc))
68 return;
70 const uint32_t* src_origin_pixel = src.GetAddr32(src_rc.point());
71 uint32_t* dest_origin_pixel = dest->GetAddr32(dest_origin);
73 int height = src_rc.height();
74 int width = src_rc.width();
75 for (int y = 0; y < height; y++) {
76 const uint32_t* src_pixel = src_origin_pixel;
77 uint32_t* dest_pixel = dest_origin_pixel;
78 for (int x = 0; x < width; x++) {
79 uint8 alpha = static_cast<uint8>(static_cast<uint32_t>(alpha_adjustment) *
80 GetAlpha(*src_pixel) / 0xFF);
81 uint8 red = ProcessColor(GetRed(*src_pixel), GetRed(*dest_pixel), alpha);
82 uint8 green = ProcessColor(GetGreen(*src_pixel),
83 GetGreen(*dest_pixel), alpha);
84 uint8 blue = ProcessColor(GetBlue(*src_pixel),
85 GetBlue(*dest_pixel), alpha);
86 *dest_pixel = MakePixel(red, green, blue, GetAlpha(*dest_pixel));
88 src_pixel++;
89 dest_pixel++;
91 src_origin_pixel = reinterpret_cast<const uint32_t*>(
92 reinterpret_cast<const char*>(src_origin_pixel) + src.stride());
93 dest_origin_pixel = reinterpret_cast<uint32_t*>(
94 reinterpret_cast<char*>(dest_origin_pixel) + dest->stride());
98 void GradientFill(pp::ImageData* image, const pp::Rect& rc,
99 uint32 start_color, uint32 end_color, bool horizontal) {
100 std::vector<uint32> colors;
101 colors.resize(horizontal ? rc.width() : rc.height());
102 for (size_t i = 0; i < colors.size(); ++i) {
103 double ratio = static_cast<double>(i) / colors.size();
104 colors[i] = MakePixel(
105 GradientChannel(GetRed(start_color), GetRed(end_color), ratio),
106 GradientChannel(GetGreen(start_color), GetGreen(end_color), ratio),
107 GradientChannel(GetBlue(start_color), GetBlue(end_color), ratio),
108 GradientChannel(GetAlpha(start_color), GetAlpha(end_color), ratio));
111 if (horizontal) {
112 const void* data = &(colors[0]);
113 size_t size = colors.size() * 4;
114 uint32_t* origin_pixel = image->GetAddr32(rc.point());
115 for (int y = 0; y < rc.height(); y++) {
116 memcpy(origin_pixel, data, size);
117 origin_pixel = reinterpret_cast<uint32_t*>(
118 reinterpret_cast<char*>(origin_pixel) + image->stride());
120 } else {
121 uint32_t* origin_pixel = image->GetAddr32(rc.point());
122 for (int y = 0; y < rc.height(); y++) {
123 uint32_t* pixel = origin_pixel;
124 for (int x = 0; x < rc.width(); x++) {
125 *pixel = colors[y];
126 pixel++;
128 origin_pixel = reinterpret_cast<uint32_t*>(
129 reinterpret_cast<char*>(origin_pixel) + image->stride());
134 void GradientFill(pp::Instance* instance,
135 pp::ImageData* image,
136 const pp::Rect& dirty_rc,
137 const pp::Rect& gradient_rc,
138 uint32 start_color,
139 uint32 end_color,
140 bool horizontal,
141 uint8 transparency) {
142 pp::Rect draw_rc = gradient_rc.Intersect(dirty_rc);
143 if (draw_rc.IsEmpty())
144 return;
146 pp::ImageData gradient(instance, PP_IMAGEDATAFORMAT_BGRA_PREMUL,
147 gradient_rc.size(), false);
149 GradientFill(&gradient, pp::Rect(pp::Point(), gradient_rc.size()),
150 start_color, end_color, horizontal);
152 pp::Rect copy_rc(draw_rc);
153 copy_rc.Offset(-gradient_rc.x(), -gradient_rc.y());
154 AlphaBlend(gradient, copy_rc, image, draw_rc.point(), transparency);
157 void CopyImage(const pp::ImageData& src, const pp::Rect& src_rc,
158 pp::ImageData* dest, const pp::Rect& dest_rc,
159 bool stretch) {
160 if (src_rc.IsEmpty() || !ImageDataContainsRect(src, src_rc))
161 return;
163 pp::Rect stretched_rc(dest_rc.point(),
164 stretch ? dest_rc.size() : src_rc.size());
165 if (stretched_rc.IsEmpty() || !ImageDataContainsRect(*dest, stretched_rc))
166 return;
168 const uint32_t* src_origin_pixel = src.GetAddr32(src_rc.point());
169 uint32_t* dest_origin_pixel = dest->GetAddr32(dest_rc.point());
170 if (stretch) {
171 double x_ratio = static_cast<double>(src_rc.width()) / dest_rc.width();
172 double y_ratio = static_cast<double>(src_rc.height()) / dest_rc.height();
173 int32_t height = dest_rc.height();
174 int32_t width = dest_rc.width();
175 for (int32_t y = 0; y < height; ++y) {
176 uint32_t* dest_pixel = dest_origin_pixel;
177 for (int32_t x = 0; x < width; ++x) {
178 uint32 src_x = static_cast<uint32>(x * x_ratio);
179 uint32 src_y = static_cast<uint32>(y * y_ratio);
180 const uint32_t* src_pixel = src.GetAddr32(
181 pp::Point(src_rc.x() + src_x, src_rc.y() + src_y));
182 *dest_pixel = *src_pixel;
183 dest_pixel++;
185 dest_origin_pixel = reinterpret_cast<uint32_t*>(
186 reinterpret_cast<char*>(dest_origin_pixel) + dest->stride());
188 } else {
189 int32_t height = src_rc.height();
190 base::CheckedNumeric<int32_t> width_bytes = src_rc.width();
191 width_bytes *= 4;
192 for (int32_t y = 0; y < height; ++y) {
193 memcpy(dest_origin_pixel, src_origin_pixel, width_bytes.ValueOrDie());
194 src_origin_pixel = reinterpret_cast<const uint32_t*>(
195 reinterpret_cast<const char*>(src_origin_pixel) + src.stride());
196 dest_origin_pixel = reinterpret_cast<uint32_t*>(
197 reinterpret_cast<char*>(dest_origin_pixel) + dest->stride());
202 void FillRect(pp::ImageData* image, const pp::Rect& rc, uint32 color) {
203 int height = rc.height();
204 if (height == 0)
205 return;
207 // Fill in first row.
208 uint32_t* top_line = image->GetAddr32(rc.point());
209 int width = rc.width();
210 for (int x = 0; x < width; x++)
211 top_line[x] = color;
213 // Fill in the rest of the rectangle.
214 int byte_width = width * 4;
215 uint32_t* cur_line = reinterpret_cast<uint32_t*>(
216 reinterpret_cast<char*>(top_line) + image->stride());
217 for (int y = 1; y < height; y++) {
218 memcpy(cur_line, top_line, byte_width);
219 cur_line = reinterpret_cast<uint32_t*>(
220 reinterpret_cast<char*>(cur_line) + image->stride());
224 ShadowMatrix::ShadowMatrix(uint32 depth, double factor, uint32 background)
225 : depth_(depth), factor_(factor), background_(background) {
226 DCHECK(depth_ > 0);
227 matrix_.resize(depth_ * depth_);
229 // pv - is a rounding power factor for smoothing corners.
230 // pv = 2.0 will make corners completely round.
231 const double pv = 4.0;
232 // pow_pv - cache to avoid recalculating pow(x, pv) every time.
233 std::vector<double> pow_pv(depth_, 0.0);
235 double r = static_cast<double>(depth_);
236 double coef = 256.0 / pow(r, factor);
238 for (uint32 y = 0; y < depth_; y++) {
239 // Since matrix is symmetrical, we can reduce the number of calculations
240 // by mirroring results.
241 for (uint32 x = 0; x <= y; x++) {
242 // Fill cache if needed.
243 if (pow_pv[x] == 0.0)
244 pow_pv[x] = pow(x, pv);
245 if (pow_pv[y] == 0.0)
246 pow_pv[y] = pow(y, pv);
248 // v - is a value for the smoothing function.
249 // If x == 0 simplify calculations.
250 double v = (x == 0) ? y : pow(pow_pv[x] + pow_pv[y], 1 / pv);
252 // Smoothing function.
253 // If factor == 1, smoothing will be linear from 0 to the end,
254 // if 0 < factor < 1, smoothing will drop faster near 0.
255 // if factor > 1, smoothing will drop faster near the end (depth).
256 double f = 256.0 - coef * pow(v, factor);
258 uint8 alpha = 0;
259 if (f > kOpaqueAlpha)
260 alpha = kOpaqueAlpha;
261 else if (f < kTransparentAlpha)
262 alpha = kTransparentAlpha;
263 else
264 alpha = static_cast<uint8>(f);
266 uint8 red = ProcessColor(0, GetRed(background), alpha);
267 uint8 green = ProcessColor(0, GetGreen(background), alpha);
268 uint8 blue = ProcessColor(0, GetBlue(background), alpha);
269 uint32 pixel = MakePixel(red, green, blue, GetAlpha(background));
271 // Mirror matrix.
272 matrix_[y * depth_ + x] = pixel;
273 matrix_[x * depth_ + y] = pixel;
278 ShadowMatrix::~ShadowMatrix() {
281 void PaintShadow(pp::ImageData* image,
282 const pp::Rect& clip_rc,
283 const pp::Rect& shadow_rc,
284 const ShadowMatrix& matrix) {
285 pp::Rect draw_rc = shadow_rc.Intersect(clip_rc);
286 if (draw_rc.IsEmpty())
287 return;
289 int32 depth = static_cast<int32>(matrix.depth());
290 for (int32_t y = draw_rc.y(); y < draw_rc.bottom(); y++) {
291 for (int32_t x = draw_rc.x(); x < draw_rc.right(); x++) {
292 int32_t matrix_x = std::max(depth + shadow_rc.x() - x - 1,
293 depth - shadow_rc.right() + x);
294 int32_t matrix_y = std::max(depth + shadow_rc.y() - y - 1,
295 depth - shadow_rc.bottom() + y);
296 uint32_t* pixel = image->GetAddr32(pp::Point(x, y));
298 if (matrix_x < 0)
299 matrix_x = 0;
300 else if (matrix_x >= static_cast<int32>(depth))
301 matrix_x = depth - 1;
303 if (matrix_y < 0)
304 matrix_y = 0;
305 else if (matrix_y >= static_cast<int32>(depth))
306 matrix_y = depth - 1;
308 *pixel = matrix.GetValue(matrix_x, matrix_y);
313 void DrawShadow(pp::ImageData* image,
314 const pp::Rect& shadow_rc,
315 const pp::Rect& object_rc,
316 const pp::Rect& clip_rc,
317 const ShadowMatrix& matrix) {
318 if (shadow_rc == object_rc)
319 return; // Nothing to paint.
321 // Fill top part.
322 pp::Rect rc(shadow_rc.point(),
323 pp::Size(shadow_rc.width(), object_rc.y() - shadow_rc.y()));
324 PaintShadow(image, rc.Intersect(clip_rc), shadow_rc, matrix);
326 // Fill bottom part.
327 rc = pp::Rect(shadow_rc.x(), object_rc.bottom(),
328 shadow_rc.width(), shadow_rc.bottom() - object_rc.bottom());
329 PaintShadow(image, rc.Intersect(clip_rc), shadow_rc, matrix);
331 // Fill left part.
332 rc = pp::Rect(shadow_rc.x(), object_rc.y(),
333 object_rc.x() - shadow_rc.x(), object_rc.height());
334 PaintShadow(image, rc.Intersect(clip_rc), shadow_rc, matrix);
336 // Fill right part.
337 rc = pp::Rect(object_rc.right(), object_rc.y(),
338 shadow_rc.right() - object_rc.right(), object_rc.height());
339 PaintShadow(image, rc.Intersect(clip_rc), shadow_rc, matrix);
342 } // namespace chrome_pdf