66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
#include <internals/bopti.h>
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#include <internals/display.h>
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/*
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dimage_part()
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Draws a portion of an image, defined by its bounding rectangle.
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Point (left, top) is included, but (left + width, top + height) is
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excluded.
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*/
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void dimage_part(int x, int y, struct Image *img, int left, int top,
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int width, int height)
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{
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if(!img || img->magic != 0xb7) return;
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struct Structure s;
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struct Command command;
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int actual_width;
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int format = img->format, i = 0;
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if(format != Format_Mono && format != Format_MonoAlpha) return;
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getStructure(img, &s);
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//---
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// Adjusting the bounding rectangle.
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//---
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// This is what happens when the bounding rectangle overflows from the
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// image...
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if(left < 0) left = 0;
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if(top < 0) top = 0;
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if(left + width > s.width) width = s.width - left;
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if(top + height > s.height) height = s.height - top;
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if(x + left + width <= 0 || x > 127 || y + top + height <= 0 || y > 63)
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return;
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command.top = (y < 0) ? (top - y) : top;
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command.bottom = top + ((y + height > 64) ? (64 - y) : height);
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command.left = ((x < 0) ? (left - x) : left) >> 5;
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actual_width = (x + width > 128) ? (128 - x) : width;
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command.right = ((left + actual_width + 31) >> 5) - 1;
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command.op = bopti_op_mono;
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if(x >= 0) getMasks(x, x + actual_width - 1, command.masks);
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else getMasks(0, actual_width + x - 1, command.masks);
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bopti_vram = display_getCurrentVRAM();
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while(format)
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{
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if(format & 1)
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{
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command.x = x - left;
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command.y = y - top;
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command.channel = (1 << i);
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bopti(s.data, &s, &command);
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s.data += s.layer_size;
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}
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format >>= 1;
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i++;
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}
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}
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