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Add an experimental OpenGL renderer

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Přemysl Eric Janouch
2021-11-12 13:45:22 +01:00
parent c214e668d9
commit 91538aaba5
6 changed files with 430 additions and 14 deletions
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18
fiv-io.c
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@@ -3451,34 +3451,40 @@ fiv_io_orientation_apply(const FivIoImage *image,
FivIoOrientation orientation, double *width, double *height)
{
fiv_io_orientation_dimensions(image, orientation, width, height);
return fiv_io_orientation_matrix(orientation, *width, *height);
}
cairo_matrix_t
fiv_io_orientation_matrix(
FivIoOrientation orientation, double width, double height)
{
cairo_matrix_t matrix = {};
cairo_matrix_init_identity(&matrix);
switch (orientation) {
case FivIoOrientation90:
cairo_matrix_rotate(&matrix, -M_PI_2);
cairo_matrix_translate(&matrix, -*width, 0);
cairo_matrix_translate(&matrix, -width, 0);
break;
case FivIoOrientation180:
cairo_matrix_scale(&matrix, -1, -1);
cairo_matrix_translate(&matrix, -*width, -*height);
cairo_matrix_translate(&matrix, -width, -height);
break;
case FivIoOrientation270:
cairo_matrix_rotate(&matrix, +M_PI_2);
cairo_matrix_translate(&matrix, 0, -*height);
cairo_matrix_translate(&matrix, 0, -height);
break;
case FivIoOrientationMirror0:
cairo_matrix_scale(&matrix, -1, +1);
cairo_matrix_translate(&matrix, -*width, 0);
cairo_matrix_translate(&matrix, -width, 0);
break;
case FivIoOrientationMirror90:
cairo_matrix_rotate(&matrix, +M_PI_2);
cairo_matrix_scale(&matrix, -1, +1);
cairo_matrix_translate(&matrix, -*width, -*height);
cairo_matrix_translate(&matrix, -width, -height);
break;
case FivIoOrientationMirror180:
cairo_matrix_scale(&matrix, +1, -1);
cairo_matrix_translate(&matrix, 0, -*height);
cairo_matrix_translate(&matrix, 0, -height);
break;
case FivIoOrientationMirror270:
cairo_matrix_rotate(&matrix, -M_PI_2);