15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <gdk/gdk.h> 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch#include "base/basictypes.h" 10ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch#include "base/logging.h" 11ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch#include "third_party/skia/include/core/SkBitmap.h" 12ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch#include "third_party/skia/include/core/SkUnPreMultiply.h" 13ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace libgtk2ui { 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// GDK_COLOR_RGB multiplies by 257 (= 0x10001) to distribute the bits evenly 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// See: http://www.mindcontrol.org/~hplus/graphics/expand-bits.html 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// To get back, we can just right shift by eight 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// (or, formulated differently, i == (i*257)/256 for all i < 256). 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)SkColor GdkColorToSkColor(GdkColor color) { 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return SkColorSetRGB(color.red >> 8, color.green >> 8, color.blue >> 8); 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)GdkColor SkColorToGdkColor(SkColor color) { 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) GdkColor gdk_color = { 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 0, 282a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) static_cast<guint16>(SkColorGetR(color) * kSkiaToGDKMultiplier), 292a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) static_cast<guint16>(SkColorGetG(color) * kSkiaToGDKMultiplier), 302a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) static_cast<guint16>(SkColorGetB(color) * kSkiaToGDKMultiplier) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) }; 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return gdk_color; 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 35ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdochconst SkBitmap GdkPixbufToImageSkia(GdkPixbuf* pixbuf) { 36ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch // TODO(erg): What do we do in the case where the pixbuf fails these dchecks? 37ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch // I would prefer to use our gtk based canvas, but that would require 38ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch // recompiling half of our skia extensions with gtk support, which we can't 39ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch // do in this build. 40ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch DCHECK_EQ(GDK_COLORSPACE_RGB, gdk_pixbuf_get_colorspace(pixbuf)); 41ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 42ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int n_channels = gdk_pixbuf_get_n_channels(pixbuf); 43ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int w = gdk_pixbuf_get_width(pixbuf); 44ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int h = gdk_pixbuf_get_height(pixbuf); 45ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 46ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch SkBitmap ret; 47116680a4aac90f2aa7413d9095a592090648e557Ben Murdoch ret.allocN32Pixels(w, h); 48ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch ret.eraseColor(0); 49ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 50ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch uint32_t* skia_data = static_cast<uint32_t*>(ret.getAddr(0, 0)); 51ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 52ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (n_channels == 4) { 53ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int total_length = w * h; 54ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch guchar* gdk_pixels = gdk_pixbuf_get_pixels(pixbuf); 55ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 56ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch // Now here's the trick: we need to convert the gdk data (which is RGBA and 57ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch // isn't premultiplied) to skia (which can be anything and premultiplied). 58ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch for (int i = 0; i < total_length; ++i, gdk_pixels += 4) { 59ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const unsigned char& red = gdk_pixels[0]; 60ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const unsigned char& green = gdk_pixels[1]; 61ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const unsigned char& blue = gdk_pixels[2]; 62ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const unsigned char& alpha = gdk_pixels[3]; 63ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 64ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch skia_data[i] = SkPreMultiplyARGB(alpha, red, green, blue); 65ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch } 66ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch } else if (n_channels == 3) { 67ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch // Because GDK makes rowstrides word aligned, we need to do something a bit 68ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch // more complex when a pixel isn't perfectly a word of memory. 69ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int rowstride = gdk_pixbuf_get_rowstride(pixbuf); 70ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch guchar* gdk_pixels = gdk_pixbuf_get_pixels(pixbuf); 71ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch for (int y = 0; y < h; ++y) { 72ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int row = y * rowstride; 73ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 74ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch for (int x = 0; x < w; ++x) { 75ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch guchar* pixel = gdk_pixels + row + (x * 3); 76ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const unsigned char& red = pixel[0]; 77ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const unsigned char& green = pixel[1]; 78ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const unsigned char& blue = pixel[2]; 79ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 80ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch skia_data[y * w + x] = SkPreMultiplyARGB(255, red, green, blue); 81ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch } 82ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch } 83ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch } else { 84ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch NOTREACHED(); 85ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch } 86ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 87ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch return ret; 88ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch} 89ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 90ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben MurdochGdkPixbuf* GdkPixbufFromSkBitmap(const SkBitmap& bitmap) { 91ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (bitmap.isNull()) 92ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch return NULL; 93ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 94ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch SkAutoLockPixels lock_pixels(bitmap); 95ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 96ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int width = bitmap.width(); 97ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int height = bitmap.height(); 98ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 99ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch GdkPixbuf* pixbuf = 100ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch gdk_pixbuf_new(GDK_COLORSPACE_RGB, // The only colorspace gtk supports. 101ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch TRUE, // There is an alpha channel. 102ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 8, 103ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch width, 104ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch height); 105ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 106ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch // SkBitmaps are premultiplied, we need to unpremultiply them. 107ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const int kBytesPerPixel = 4; 108ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch uint8* divided = gdk_pixbuf_get_pixels(pixbuf); 109ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 110ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch for (int y = 0, i = 0; y < height; y++) { 111ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch for (int x = 0; x < width; x++) { 112ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch uint32 pixel = bitmap.getAddr32(0, y)[x]; 113ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 114ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int alpha = SkColorGetA(pixel); 115ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (alpha != 0 && alpha != 255) { 116ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch SkColor unmultiplied = SkUnPreMultiply::PMColorToColor(pixel); 117ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch divided[i + 0] = SkColorGetR(unmultiplied); 118ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch divided[i + 1] = SkColorGetG(unmultiplied); 119ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch divided[i + 2] = SkColorGetB(unmultiplied); 120ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch divided[i + 3] = alpha; 121ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch } else { 122ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch divided[i + 0] = SkColorGetR(pixel); 123ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch divided[i + 1] = SkColorGetG(pixel); 124ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch divided[i + 2] = SkColorGetB(pixel); 125ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch divided[i + 3] = alpha; 126ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch } 127ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch i += kBytesPerPixel; 128ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch } 129ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch } 130ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 131ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch return pixbuf; 132ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch} 133ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace libgtk2ui 135