214 lines
6.1 KiB
C
214 lines
6.1 KiB
C
#include "mupdf/fitz.h"
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#include <assert.h>
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#define STACK_SIZE 96
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typedef struct fz_bbox_device_s
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{
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fz_device super;
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fz_rect *result;
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int top;
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fz_rect stack[STACK_SIZE];
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/* mask content and tiles are ignored */
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int ignore;
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} fz_bbox_device;
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static void
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fz_bbox_add_rect(fz_context *ctx, fz_device *dev, fz_rect rect, int clip)
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{
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fz_bbox_device *bdev = (fz_bbox_device*)dev;
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if (0 < bdev->top && bdev->top <= STACK_SIZE)
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{
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rect = fz_intersect_rect(rect, bdev->stack[bdev->top-1]);
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}
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if (!clip && bdev->top <= STACK_SIZE && !bdev->ignore)
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{
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*bdev->result = fz_union_rect(*bdev->result, rect);
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}
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if (clip && ++bdev->top <= STACK_SIZE)
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{
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bdev->stack[bdev->top-1] = rect;
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}
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}
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static void
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fz_bbox_fill_path(fz_context *ctx, fz_device *dev, const fz_path *path, int even_odd, fz_matrix ctm,
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fz_colorspace *colorspace, const float *color, float alpha, fz_color_params color_params)
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{
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fz_bbox_add_rect(ctx, dev, fz_bound_path(ctx, path, NULL, ctm), 0);
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}
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static void
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fz_bbox_stroke_path(fz_context *ctx, fz_device *dev, const fz_path *path, const fz_stroke_state *stroke,
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fz_matrix ctm, fz_colorspace *colorspace, const float *color, float alpha, fz_color_params color_params)
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{
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fz_bbox_add_rect(ctx, dev, fz_bound_path(ctx, path, stroke, ctm), 0);
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}
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static void
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fz_bbox_fill_text(fz_context *ctx, fz_device *dev, const fz_text *text, fz_matrix ctm,
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fz_colorspace *colorspace, const float *color, float alpha, fz_color_params color_params)
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{
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fz_bbox_add_rect(ctx, dev, fz_bound_text(ctx, text, NULL, ctm), 0);
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}
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static void
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fz_bbox_stroke_text(fz_context *ctx, fz_device *dev, const fz_text *text, const fz_stroke_state *stroke,
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fz_matrix ctm, fz_colorspace *colorspace, const float *color, float alpha, fz_color_params color_params)
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{
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fz_bbox_add_rect(ctx, dev, fz_bound_text(ctx, text, stroke, ctm), 0);
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}
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static void
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fz_bbox_fill_shade(fz_context *ctx, fz_device *dev, fz_shade *shade, fz_matrix ctm, float alpha, fz_color_params color_params)
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{
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fz_bbox_add_rect(ctx, dev, fz_bound_shade(ctx, shade, ctm), 0);
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}
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static void
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fz_bbox_fill_image(fz_context *ctx, fz_device *dev, fz_image *image, fz_matrix ctm, float alpha, fz_color_params color_params)
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{
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fz_bbox_add_rect(ctx, dev, fz_transform_rect(fz_unit_rect, ctm), 0);
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}
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static void
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fz_bbox_fill_image_mask(fz_context *ctx, fz_device *dev, fz_image *image, fz_matrix ctm,
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fz_colorspace *colorspace, const float *color, float alpha, fz_color_params color_params)
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{
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fz_bbox_add_rect(ctx, dev, fz_transform_rect(fz_unit_rect, ctm), 0);
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}
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static void
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fz_bbox_clip_path(fz_context *ctx, fz_device *dev, const fz_path *path, int even_odd, fz_matrix ctm, fz_rect scissor)
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{
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fz_bbox_add_rect(ctx, dev, fz_bound_path(ctx, path, NULL, ctm), 1);
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}
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static void
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fz_bbox_clip_stroke_path(fz_context *ctx, fz_device *dev, const fz_path *path, const fz_stroke_state *stroke, fz_matrix ctm, fz_rect scissor)
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{
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fz_bbox_add_rect(ctx, dev, fz_bound_path(ctx, path, stroke, ctm), 1);
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}
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static void
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fz_bbox_clip_text(fz_context *ctx, fz_device *dev, const fz_text *text, fz_matrix ctm, fz_rect scissor)
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{
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fz_bbox_add_rect(ctx, dev, fz_bound_text(ctx, text, NULL, ctm), 1);
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}
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static void
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fz_bbox_clip_stroke_text(fz_context *ctx, fz_device *dev, const fz_text *text, const fz_stroke_state *stroke, fz_matrix ctm, fz_rect scissor)
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{
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fz_bbox_add_rect(ctx, dev, fz_bound_text(ctx, text, stroke, ctm), 1);
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}
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static void
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fz_bbox_clip_image_mask(fz_context *ctx, fz_device *dev, fz_image *image, fz_matrix ctm, fz_rect scissor)
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{
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fz_bbox_add_rect(ctx, dev, fz_transform_rect(fz_unit_rect, ctm), 1);
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}
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static void
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fz_bbox_pop_clip(fz_context *ctx, fz_device *dev)
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{
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fz_bbox_device *bdev = (fz_bbox_device*)dev;
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if (bdev->top > 0)
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bdev->top--;
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else
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fz_warn(ctx, "unexpected pop clip");
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}
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static void
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fz_bbox_begin_mask(fz_context *ctx, fz_device *dev, fz_rect rect, int luminosity, fz_colorspace *colorspace, const float *color, fz_color_params color_params)
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{
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fz_bbox_device *bdev = (fz_bbox_device*)dev;
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fz_bbox_add_rect(ctx, dev, rect, 1);
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bdev->ignore++;
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}
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static void
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fz_bbox_end_mask(fz_context *ctx, fz_device *dev)
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{
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fz_bbox_device *bdev = (fz_bbox_device*)dev;
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assert(bdev->ignore > 0);
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bdev->ignore--;
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}
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static void
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fz_bbox_begin_group(fz_context *ctx, fz_device *dev, fz_rect rect, fz_colorspace *cs, int isolated, int knockout, int blendmode, float alpha)
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{
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fz_bbox_add_rect(ctx, dev, rect, 1);
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}
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static void
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fz_bbox_end_group(fz_context *ctx, fz_device *dev)
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{
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fz_bbox_pop_clip(ctx, dev);
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}
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static int
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fz_bbox_begin_tile(fz_context *ctx, fz_device *dev, fz_rect area, fz_rect view, float xstep, float ystep, fz_matrix ctm, int id)
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{
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fz_bbox_device *bdev = (fz_bbox_device*)dev;
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fz_bbox_add_rect(ctx, dev, fz_transform_rect(area, ctm), 0);
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bdev->ignore++;
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return 0;
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}
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static void
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fz_bbox_end_tile(fz_context *ctx, fz_device *dev)
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{
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fz_bbox_device *bdev = (fz_bbox_device*)dev;
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assert(bdev->ignore > 0);
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bdev->ignore--;
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}
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/*
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Create a device to compute the bounding
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box of all marks on a page.
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The returned bounding box will be the union of all bounding
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boxes of all objects on a page.
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*/
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fz_device *
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fz_new_bbox_device(fz_context *ctx, fz_rect *result)
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{
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fz_bbox_device *dev = fz_new_derived_device(ctx, fz_bbox_device);
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dev->super.fill_path = fz_bbox_fill_path;
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dev->super.stroke_path = fz_bbox_stroke_path;
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dev->super.clip_path = fz_bbox_clip_path;
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dev->super.clip_stroke_path = fz_bbox_clip_stroke_path;
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dev->super.fill_text = fz_bbox_fill_text;
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dev->super.stroke_text = fz_bbox_stroke_text;
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dev->super.clip_text = fz_bbox_clip_text;
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dev->super.clip_stroke_text = fz_bbox_clip_stroke_text;
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dev->super.fill_shade = fz_bbox_fill_shade;
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dev->super.fill_image = fz_bbox_fill_image;
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dev->super.fill_image_mask = fz_bbox_fill_image_mask;
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dev->super.clip_image_mask = fz_bbox_clip_image_mask;
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dev->super.pop_clip = fz_bbox_pop_clip;
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dev->super.begin_mask = fz_bbox_begin_mask;
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dev->super.end_mask = fz_bbox_end_mask;
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dev->super.begin_group = fz_bbox_begin_group;
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dev->super.end_group = fz_bbox_end_group;
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dev->super.begin_tile = fz_bbox_begin_tile;
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dev->super.end_tile = fz_bbox_end_tile;
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dev->result = result;
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dev->top = 0;
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dev->ignore = 0;
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*result = fz_empty_rect;
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return (fz_device*)dev;
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}
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