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gdi: manually convert RGB444 to RGB555 to get around BI_BITFIELDS limitation on non-NT platforms

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This commit is contained in:
Brad Parker 2017-09-01 20:52:58 -04:00
parent 145e404211
commit 35c4770c9b
1 changed files with 74 additions and 14 deletions
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88
gfx/drivers/gdi_gfx.c
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@ -30,6 +30,7 @@
#include "../../driver.h"
#include "../../configuration.h"
#include "../../verbosity.h"
#include "../../frontend/frontend_driver.h"
#include "../common/gdi_common.h"
#if defined(_WIN32) && !defined(_XBOX)
@ -47,9 +48,31 @@ static unsigned gdi_video_bits = 0;
static unsigned gdi_menu_bits = 0;
static bool gdi_rgb32 = false;
static bool gdi_menu_rgb32 = false;
static int gdi_win_major = 0;
static int gdi_win_minor = 0;
static bool gdi_lte_win98 = false;
static unsigned short *gdi_temp_buf = NULL;
static void gdi_gfx_create(void)
{
char os[64] = {0};
frontend_ctx_driver_t *ctx = frontend_get_ptr();
if (!ctx || !ctx->get_os)
{
RARCH_ERR("[GDI] No frontend driver found.\n");
return;
}
ctx->get_os(os, sizeof(os), &gdi_win_major, &gdi_win_minor);
// Are we running on Windows 98 or below?
if (gdi_win_major < 4 || (gdi_win_major == 4 && gdi_win_minor <= 10))
{
RARCH_LOG("[GDI] Win98 or lower detected, using slow frame conversion method for RGB444.\n");
gdi_lte_win98 = true;
}
}
static void *gdi_gfx_init(const video_info_t *video,
@ -226,6 +249,16 @@ static bool gdi_gfx_frame(void *data, const void *frame,
gdi->video_height = height;
gdi->bmp = CreateCompatibleBitmap(gdi->winDC, gdi->video_width, gdi->video_height);
gdi->bmp_old = (HBITMAP)SelectObject(gdi->memDC, gdi->bmp);
if (gdi_lte_win98)
{
if (gdi_temp_buf)
{
free(gdi_temp_buf);
}
gdi_temp_buf = (unsigned short*)malloc(width * height * sizeof(unsigned short));
}
}
video_context_driver_get_video_size(&mode);
@ -244,24 +277,45 @@ static bool gdi_gfx_frame(void *data, const void *frame,
if (bits == 16)
{
unsigned *masks = (unsigned*)info->bmiColors;
info->bmiHeader.biCompression = BI_BITFIELDS;
/* default 16-bit format on Windows is XRGB1555 */
if (frame_to_copy == gdi_menu_frame)
if (gdi_lte_win98 && gdi_temp_buf)
{
/* map RGB444 color bits for RGUI */
masks[0] = 0xF000;
masks[1] = 0x0F00;
masks[2] = 0x00F0;
/* Win98 and below cannot use BI_BITFIELDS with RGB444,
* so convert it to RGB555 first. */
unsigned x, y;
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
unsigned short pixel = ((unsigned short*)frame_to_copy)[width * y + x];
gdi_temp_buf[width * y + x] = (pixel & 0xF000) >> 1 | (pixel & 0x0F00) >> 2 | (pixel & 0x00F0) >> 3;
}
}
frame_to_copy = gdi_temp_buf;
info->bmiHeader.biCompression = BI_RGB;
}
else
{
/* map RGB565 color bits for core */
masks[0] = 0xF800;
masks[1] = 0x07E0;
masks[2] = 0x001F;
unsigned *masks = (unsigned*)info->bmiColors;
info->bmiHeader.biCompression = BI_BITFIELDS;
/* default 16-bit format on Windows is XRGB1555 */
if (frame_to_copy == gdi_menu_frame)
{
/* map RGB444 color bits for RGUI */
masks[0] = 0xF000;
masks[1] = 0x0F00;
masks[2] = 0x00F0;
}
else
{
/* map RGB565 color bits for core */
masks[0] = 0xF800;
masks[1] = 0x07E0;
masks[2] = 0x001F;
}
}
}
else
@ -348,6 +402,12 @@ static void gdi_gfx_free(void *data)
gdi_menu_frame = NULL;
}
if (gdi_temp_buf)
{
free(gdi_temp_buf);
gdi_temp_buf = NULL;
}
if (!gdi)
return;