Misc/abrash-black-book
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James Gregory 2013-12-30 18:34:31 +11:00
commit 18011c595a
352 changed files with 6040 additions and 6040 deletions
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32-03.md
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@ -48,7 +48,7 @@
/* Draw the line */
Draw360x480Dot(X0, Y0, Color); /* draw the first pixel */
while ( DeltaX-- ) {
/* See if it’s time to advance the Y coordinate */
/* See if it's time to advance the Y coordinate */
if ( ErrorTerm >= 0 ) {
/* Advance the Y coordinate & adjust the error term
back down */
@ -85,7 +85,7 @@
Draw360x480Dot(X0, Y0, Color);/* draw the first pixel */
while ( DeltaY-- ) {
/* See if it’s time to advance the X coordinate */
/* See if it's time to advance the X coordinate */
if ( ErrorTerm >= 0 ) {
/* Advance the X coordinate & adjust the error term
back down */
@ -198,19 +198,19 @@
VectorsUp(X_MAX * 3 / 4, Y_MAX * 3 / 4, X_MAX / 4, Y_MAX / 4, 4);
/* Wait for the enter key to be pressed */
scanf(“%c”, &temp);
scanf("%c", &temp);
/* Back to text mode */
_AX = TEXT_MODE;
geninterrupt(BIOS_VIDEO_INT);
}
The first thing you’ll notice when you run this code is that the speed
The first thing you'll notice when you run this code is that the speed
of 360x480 256-color mode is pretty good, especially considering that
most of the program is im-plemented in C.
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![](images/i.jpg) *Drawing in 360x480 256-color mode can sometimes actually be faster than in the 16-color modes, because the byte-per-pixel display memory organization of 256-color mode eliminates the need to read display memory before writing to it in order to isolate individual pixels coexisting within a single byte. In addition, 360x480 256-color mode is a variant of Mode X, which we’ll encounter in detail in Chapter 47, and supports all the high-performance features of Mode X.*
![](images/i.jpg) *Drawing in 360x480 256-color mode can sometimes actually be faster than in the 16-color modes, because the byte-per-pixel display memory organization of 256-color mode eliminates the need to read display memory before writing to it in order to isolate individual pixels coexisting within a single byte. In addition, 360x480 256-color mode is a variant of Mode X, which we'll encounter in detail in Chapter 47, and supports all the high-performance features of Mode X.*
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