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DOS: scale 16-bit core video to fit screen

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This commit is contained in:
Brad Parker 2017-01-29 00:48:15 -05:00
parent e2b3c72b9d
commit 343ac9fea7
1 changed files with 48 additions and 1 deletions
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49
gfx/drivers/vga_gfx.c
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@ -31,6 +31,7 @@
#include "../../verbosity.h"
static unsigned char *vga_menu_frame = NULL;
static unsigned char *vga_frame = NULL;
static unsigned vga_menu_width = 0;
static unsigned vga_menu_height = 0;
static unsigned vga_menu_pitch = 0;
@ -123,9 +124,17 @@ static void *vga_gfx_init(const video_info_t *video,
vga_rgb32 = video->rgb32;
if (video->rgb32)
{
vga_video_pitch = video->width * 4;
vga_video_bits = 32;
}
else
{
vga_video_pitch = video->width * 2;
vga_video_bits = 16;
}
vga_frame = (unsigned char*)malloc(VGA_WIDTH * VGA_HEIGHT);
vga_gfx_create();
@ -185,6 +194,7 @@ static bool vga_gfx_frame(void *data, const void *frame,
width = vga_video_width;
height = vga_video_height;
pitch = vga_video_pitch;
bits = vga_video_bits;
if (frame_width == 4 && frame_height == 4 && (frame_width < width && frame_height < height))
draw = false;
@ -196,7 +206,38 @@ static bool vga_gfx_frame(void *data, const void *frame,
if (draw)
{
vga_vsync();
dosmemput(frame_to_copy, MIN(320,width)*MIN(200,height), 0xA0000);
if (frame_to_copy == vga_menu_frame)
dosmemput(frame_to_copy, MIN(VGA_WIDTH,width)*MIN(VGA_HEIGHT,height), 0xA0000);
else
{
if (bits == 32)
(void)bits;
else if (bits == 16)
{
unsigned x, y;
for (y = 0; y < VGA_HEIGHT; y++)
{
for (x = 0; x < VGA_WIDTH; x++)
{
/* scale incoming frame to fit the screen */
unsigned scaled_x = (width / VGA_WIDTH) * x;
unsigned scaled_y = (height / VGA_HEIGHT) * y;
unsigned short pixel = ((unsigned short*)frame_to_copy)[width * scaled_y + scaled_x];
/* convert RGB565 to RGB332 */
unsigned r = (7.0f / 31.0f) * ((pixel & 0xF800) >> 11);
unsigned g = (7.0f / 63.0f) * ((pixel & 0x07E0) >> 5);
unsigned b = (3.0f / 31.0f) * ((pixel & 0x001F) >> 0);
vga_frame[VGA_WIDTH * y + x] = (b << 6) | (g << 3) | r;
}
}
dosmemput(vga_frame, VGA_WIDTH*VGA_HEIGHT, 0xA0000);
}
}
}
if (msg)
@ -243,6 +284,12 @@ static void vga_gfx_free(void *data)
{
(void)data;
if (vga_frame)
{
free(vga_frame);
vga_frame = NULL;
}
if (vga_menu_frame)
{
free(vga_menu_frame);