diff options
| -rw-r--r-- | src/page.c | 70 |
1 files changed, 70 insertions, 0 deletions
@@ -348,6 +348,64 @@ render_operation_w(struct content_operation *operation, struct graphics_state *g return NSPDFERROR_OK; } +static inline nspdferror +render_operation_q(struct graphics_state *gs) +{ + gs->param_stack[gs->param_stack_idx + 1] = gs->param_stack[gs->param_stack_idx]; + gs->param_stack_idx++; + return NSPDFERROR_OK; +} + +static inline nspdferror +render_operation_Q(struct graphics_state *gs) +{ + if (gs->param_stack_idx > 0) { + gs->param_stack_idx--; + } + return NSPDFERROR_OK; +} + +/** + * pre-multiply matrix + */ +static inline nspdferror +render_operation_cm(struct content_operation *operation, struct graphics_state *gs) +{ + float M[6]; /* result matrix */ + /* M' = Mt * M */ + /* M' = Mo * Mc where Mo is operation and Mc is graphics state ctm */ + /* | a b c | | A B C | | aA+bP+cU aB+bQ+cV aC+bR+cW | + * | p q r | * | P Q R | = | pA+qP+rU pB+qQ+rV pC+qR+rW | + * | u v w | | U V W | | uA+vP+wU uB+vQ+wV uC+vR+wW | + * + * | o[0] o[1] 0 | | c[0] c[1] 0 | | o[0]*c[0]+o[1]*c[2] o[0]*c[1]+o[1]*c[3] 0 | + * | o[2] o[3] 0 | * | c[2] c[3] 0 | = | o[2]*c[0]+o[3]*c[2] o[2]*c[1]+o[3]*c[3] 0 | + * | o[4] o[5] 1 | | c[4] c[5] 1 | | o[4]*c[0]+o[5]*c[2]+c[4] o[4]*c[1]+o[5]*c[3]+c[5] 1 | + */ + M[0] = operation->u.number[0] * gs->param_stack[gs->param_stack_idx].ctm[0] + + operation->u.number[1] * gs->param_stack[gs->param_stack_idx].ctm[2]; + M[1] = operation->u.number[0] * gs->param_stack[gs->param_stack_idx].ctm[1] + + operation->u.number[1] * gs->param_stack[gs->param_stack_idx].ctm[3]; + M[2] = operation->u.number[2] * gs->param_stack[gs->param_stack_idx].ctm[0] + + operation->u.number[3] * gs->param_stack[gs->param_stack_idx].ctm[2]; + M[3] = operation->u.number[2] * gs->param_stack[gs->param_stack_idx].ctm[1] + + operation->u.number[3] * gs->param_stack[gs->param_stack_idx].ctm[3]; + M[4] = operation->u.number[4] * gs->param_stack[gs->param_stack_idx].ctm[0] + + operation->u.number[5] * gs->param_stack[gs->param_stack_idx].ctm[2] + + gs->param_stack[gs->param_stack_idx].ctm[4]; + M[5] = operation->u.number[4] * gs->param_stack[gs->param_stack_idx].ctm[1] + + operation->u.number[5] * gs->param_stack[gs->param_stack_idx].ctm[3] + + gs->param_stack[gs->param_stack_idx].ctm[5]; + + gs->param_stack[gs->param_stack_idx].ctm[0] = M[0]; + gs->param_stack[gs->param_stack_idx].ctm[1] = M[1]; + gs->param_stack[gs->param_stack_idx].ctm[2] = M[2]; + gs->param_stack[gs->param_stack_idx].ctm[3] = M[3]; + gs->param_stack[gs->param_stack_idx].ctm[4] = M[4]; + gs->param_stack[gs->param_stack_idx].ctm[5] = M[5]; + return NSPDFERROR_OK; +} + /** * Initialise the parameter stack * @@ -454,6 +512,18 @@ nspdf_page_render(struct nspdf_doc *doc, //printf("line width:%f\n", gs.param_stack[gs.param_stack_idx].line_width); break; + case CONTENT_OP_q: /* push parameter stack */ + res = render_operation_q(&gs); + break; + + case CONTENT_OP_Q: /* pop parameter stack */ + res = render_operation_Q(&gs); + break; + + case CONTENT_OP_cm: /* change matrix */ + res = render_operation_cm(operation, &gs); + break; + default: printf("operator %s\n", nspdf__cos_content_operator_name(operation->operator)); |