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Only tile big (> Qt OpenGL cache size / 2) images

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This commit is contained in:
Martin Tůma 2023-04-02 14:36:03 +02:00
parent c114383c85
commit 84a592998d
1 changed files with 6 additions and 1 deletions
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7
src/map/image.cpp
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@ -2,6 +2,11 @@
#include "image.h"
#define TILE_SIZE 256
#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
#define OPENGL_SIZE_LIMIT 536870912 /* 512MB */
#else
#define OPENGL_SIZE_LIMIT 134217728 /* 128MB */
#endif
void Image::draw(QPainter *painter, const QRectF &rect, Map::Flags flags)
{
@ -11,7 +16,7 @@ void Image::draw(QPainter *painter, const QRectF &rect, Map::Flags flags)
/* When OpenGL is used, big images are rendered incredibly slow or not at
all using the QPainter::drawImage() function with a source rect set. So
we have to tile the image ourself before it can be drawn. */
if (flags & Map::OpenGL) {
if (flags & Map::OpenGL && _img.sizeInBytes() > OPENGL_SIZE_LIMIT) {
for (int i = sr.left()/TILE_SIZE; i <= sr.right()/TILE_SIZE; i++) {
for (int j = sr.top()/TILE_SIZE; j <= sr.bottom()/TILE_SIZE; j++) {
QPoint tl(i * TILE_SIZE, j * TILE_SIZE);