本文整理汇总了C++中BScreen::ColorMap方法的典型用法代码示例。如果您正苦于以下问题：C++ BScreen::ColorMap方法的具体用法？C++ BScreen::ColorMap怎么用？C++ BScreen::ColorMap使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类BScreen的用法示例。
在下文中一共展示了BScreen::ColorMap方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: BBitmap
/*!
* \brief Turn a bitmap in grayscale
*
* The output bitmap will be of the same size and will use the same color space
* of the original. Currently supports the following color spaces: B_CMAP8,
* B_RGB24, B_RGB24_BIG, B_RGB32, B_BRGBA32, B_RGB32_BIG, B_RGBA32_BIG;
* transparency is maintained. With all other color spaces, the function will
* return a copy of the bitmap (note that B_GRAY8 and B_GRAY1 are already
* grayscale).
*
* \todo Support more color spaces
*
* @param[in] bitmap The bitmap you want to turn in grayscale
*
* \return If bitmap is \c NULL or isn't valid, returns \c NULL, or a new
* bitmap. It's up to you to delete the bitmap when you are done with
* it.
*/
BBitmap * BitmapUtils::Grayscale(BBitmap *bitmap)
{
if (bitmap == NULL) return NULL;
if (!bitmap->IsValid()) return NULL;
// To obtain the disabled bitmap, we turn the original bitmap in
// grayscale, converting each pixel from RGB to YCbCr and taking only
// the Y component (luminance).
int32 x, y, width, height, offset, row_length;
unsigned char *i_bits, *o_bits;
BBitmap *ret;
uint8 Yc;
ret = new BBitmap(bitmap->Bounds(), bitmap->ColorSpace());
i_bits = (unsigned char*)bitmap->Bits();
o_bits = (unsigned char*)ret->Bits();
height = bitmap->Bounds().IntegerHeight() + 1;
width = bitmap->Bounds().IntegerWidth() + 1;
row_length = bitmap->BytesPerRow();
switch (bitmap->ColorSpace()) {
// B_CMAP8: each pixel (one byte) is the index of a color in the
// system's color table. The table can be obtained from a BScreen
// object.
case B_CMAP8: {
const rgb_color *color;
const color_map *map;
BScreen screen;
map = screen.ColorMap();
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
offset = y * row_length + x;
if (i_bits[offset] == B_TRANSPARENT_8_BIT)
o_bits[offset] = B_TRANSPARENT_8_BIT;
else {
color = map->color_list + i_bits[offset];
Yc = __Yc(color->red, color->green, color->blue);
o_bits[offset] = screen.IndexForColor(Yc, Yc, Yc);
}
}
}
} break;
// B_RGB24 = BGR 8:8:8
case B_RGB24:
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
offset = y * row_length + x * 3;
Yc = __Yc(i_bits[offset + 2], i_bits[offset + 1],
i_bits[offset]);
o_bits[offset + 1] = Yc;
o_bits[offset + 2] = Yc;
o_bits[offset + 3] = Yc;
}
}
break;
// B_RGB32 = BGRA 8:8:8:8
// B_RGBA32 = BGRx 8:8:8:8
case B_RGB32:
case B_RGBA32:
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
offset = y * row_length + x * 4;
Yc = __Yc(i_bits[offset + 2], i_bits[offset + 1],
i_bits[offset]);
o_bits[offset] = Yc;
o_bits[offset + 1] = Yc;
o_bits[offset + 2] = Yc;
o_bits[offset + 3] = i_bits[offset];
}
}
break;
// B_RGB24_BIG = RGB 8:8:8
case B_RGB24_BIG:
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
offset = y * row_length + x * 3;
Yc = __Yc(i_bits[offset], i_bits[offset + 1],
//.........这里部分代码省略.........