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more general rgb fix

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This commit is contained in:
David Rose 2009-07-09 18:43:24 +00:00
parent 68fd96555c
commit e214d8c9ef
2 changed files with 29 additions and 9 deletions
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3
direct/src/plugin/p3dSplashWindow.cxx
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@ -188,7 +188,8 @@ read_image(const string &image_filename, bool image_filename_temp,
row_stride = width * num_channels;
// We'll pad row_stride out to word alignment. Windows requires this.
// We'll pad row_stride out to word alignment, in case someone
// requires this.
row_stride = 4 * ((row_stride + 3) / 4);
size_t buffer_size = height * row_stride;

35
direct/src/plugin/p3dWinSplashWindow.cxx
View File

@ -467,19 +467,38 @@ update_image_filename(const string &image_filename, bool image_filename_temp) {
return;
}
size_t data_length = data.length();
char *new_data = new char[data_length];
memcpy(new_data, data.data(), data_length);
// Massage the data into Windows' conventions.
int new_row_stride = (_bitmap_width * 3);
// DWORD-pad the row.
new_row_stride = 4 * ((new_row_stride + 3) / 4);
int new_data_length = new_row_stride * _bitmap_height;
char *new_data = new char[new_data_length];
if (num_channels == 3) {
// We have to reverse the order of the RGB channels: libjpeg and
// Windows follow an opposite convention.
for (int yi = 0; yi < _bitmap_height; ++yi) {
char *dp = new_data + yi * row_stride;
const char *sp = data.data() + yi * row_stride;
char *dp = new_data + yi * new_row_stride;
for (int xi = 0; xi < _bitmap_width; ++xi) {
char b = dp[0];
dp[0] = dp[2];
dp[2] = b;
dp[0] = sp[2];
dp[1] = sp[1];
dp[2] = sp[0];
sp += num_channels;
dp += 3;
}
}
} else if (num_channels == 1) {
// A grayscale image. Replicate out the channels.
for (int yi = 0; yi < _bitmap_height; ++yi) {
const char *sp = data.data() + yi * row_stride;
char *dp = new_data + yi * new_row_stride;
for (int xi = 0; xi < _bitmap_width; ++xi) {
dp[0] = sp[0];
dp[1] = sp[0];
dp[2] = sp[0];
sp += num_channels;
dp += 3;
}
}
@ -491,7 +510,7 @@ update_image_filename(const string &image_filename, bool image_filename_temp) {
bmih.biWidth = _bitmap_width;
bmih.biHeight = -_bitmap_height;
bmih.biPlanes = 1;
bmih.biBitCount = 8 * num_channels;
bmih.biBitCount = 24;
bmih.biCompression = BI_RGB;
bmih.biSizeImage = 0;
bmih.biXPelsPerMeter = 0;