OSDConsoleRenderer.cc

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#include "OSDConsoleRenderer.hh"
#include "CommandConsole.hh"
#include "BooleanSetting.hh"
#include "SDLImage.hh"
#include "Display.hh"
#include "InputEventGenerator.hh"
#include "Timer.hh"
#include "FileContext.hh"
#include "CliComm.hh"
#include "Reactor.hh"
#include "MSXException.hh"
#include "openmsx.hh"
#include "unreachable.hh"
#include "xrange.hh"
#include <algorithm>
#include <cassert>
#include <memory>

#include "components.hh"
#if COMPONENT_GL
#include "GLImage.hh"
#endif

using std::string;
using namespace gl;

namespace openmsx {

static const int CONSOLE_ALPHA = 180;
static const uint64_t BLINK_RATE = 500000; // us
static const int CHAR_BORDER = 4;


// class OSDConsoleRenderer

static const string_view defaultFont = "skins/VeraMono.ttf.gz";

OSDConsoleRenderer::OSDConsoleRenderer(
                Reactor& reactor_, CommandConsole& console_,
                unsigned screenW_, unsigned screenH_,
                bool openGL_)
        : Layer(COVER_NONE, Z_CONSOLE)
        , reactor(reactor_)
        , display(reactor.getDisplay()) // need to store because still needed during destructor
        , console(console_)
        , consoleSetting(console.getConsoleSetting())
        , screenW(screenW_)
        , screenH(screenH_)
        , openGL(openGL_)
        , consolePlacementSetting(
                reactor.getCommandController(), "consoleplacement",
                "position of the console within the emulator",
                // On Android, console must by default be placed on top, in
                // order to prevent that it overlaps with the virtual Android
                // keyboard, which is always placed at the bottom of the screen
                PLATFORM_ANDROID ? CP_TOP : CP_BOTTOM,
                EnumSetting<Placement>::Map{
                        {"topleft",     CP_TOPLEFT},
                        {"top",         CP_TOP},
                        {"topright",    CP_TOPRIGHT},
                        {"left",        CP_LEFT},
                        {"center",      CP_CENTER},
                        {"right",       CP_RIGHT},
                        {"bottomleft",  CP_BOTTOMLEFT},
                        {"bottom",      CP_BOTTOM},
                        {"bottomright", CP_BOTTOMRIGHT}})
        , fontSizeSetting(reactor.getCommandController(),
                "consolefontsize", "Size of the console font", 12, 8, 32)
        , fontSetting(reactor.getCommandController(),
                "consolefont", "console font file", defaultFont)
        , consoleColumnsSetting(reactor.getCommandController(),
                "consolecolumns", "number of columns in the console",
                initFontAndGetColumns(), 32, 999)
        , consoleRowsSetting(reactor.getCommandController(),
                "consolerows", "number of rows in the console",
                getRows(), 1, 99)
        , backgroundSetting(reactor.getCommandController(),
                "consolebackground", "console background file",
                "skins/ConsoleBackgroundGrey.png")
{
#if !COMPONENT_GL
        assert(!openGL);
#endif
        bgPos = bgSize = ivec2(); // recalc on first paint()
        blink = false;
        lastBlinkTime = Timer::getTime();
        lastCursorX = lastCursorY = 0;

        active = false;
        activeTime = 0;
        setCoverage(COVER_PARTIAL);

        adjustColRow();

        // background (only load backgound on first paint())
        backgroundSetting.setChecker([this](TclObject& value) {
                loadBackground(value.getString());
        });
        // don't yet load background

        consoleSetting.attach(*this);
        fontSetting.attach(*this);
        fontSizeSetting.attach(*this);
        setActive(consoleSetting.getBoolean());
}

int OSDConsoleRenderer::initFontAndGetColumns()
{
        // init font
        fontSetting.setChecker([this](TclObject& value) {
                loadFont(value.getString().str());
        });
        try {
                loadFont(fontSetting.getString());
        } catch (MSXException&) {
                // This will happen when you upgrade from the old .png based
                // fonts to the new .ttf fonts. So provide a smooth upgrade path.
                reactor.getCliComm().printWarning(
                        "Loading selected font (", fontSetting.getString(),
                        ") failed. Reverting to default font (", defaultFont, ").");
                fontSetting.setString(defaultFont);
                if (font.empty()) {
                        // we can't continue without font
                        throw FatalError("Couldn't load default console font.\n"
                                         "Please check your installation.");
                }
        }

        return (((screenW - CHAR_BORDER) / font.getWidth()) * 30) / 32;
}
int OSDConsoleRenderer::getRows()
{
        // initFontAndGetColumns() must already be called
        return ((screenH / font.getHeight()) * 6) / 15;
}
OSDConsoleRenderer::~OSDConsoleRenderer()
{
        fontSizeSetting.detach(*this);
        fontSetting.detach(*this);
        consoleSetting.detach(*this);
        setActive(false);
}

void OSDConsoleRenderer::adjustColRow()
{
        unsigned consoleColumns = std::min<unsigned>(
                consoleColumnsSetting.getInt(),
                (screenW - CHAR_BORDER) / font.getWidth());
        unsigned consoleRows = std::min<unsigned>(
                consoleRowsSetting.getInt(),
                screenH / font.getHeight());
        console.setColumns(consoleColumns);
        console.setRows(consoleRows);
}

void OSDConsoleRenderer::update(const Setting& setting)
{
        if (&setting == &consoleSetting) {
                setActive(consoleSetting.getBoolean());
        } else if ((&setting == &fontSetting) ||
                   (&setting == &fontSizeSetting)) {
                loadFont(fontSetting.getString());
        } else {
                UNREACHABLE;
        }
}

void OSDConsoleRenderer::setActive(bool active_)
{
        if (active == active_) return;
        active = active_;

        display.repaintDelayed(40000); // 25 fps

        activeTime = Timer::getTime();

        reactor.getInputEventGenerator().setKeyRepeat(active);
}

byte OSDConsoleRenderer::getVisibility() const
{
        const uint64_t FADE_IN_DURATION  = 100000;
        const uint64_t FADE_OUT_DURATION = 150000;

        auto now = Timer::getTime();
        auto dur = now - activeTime;
        if (active) {
                if (dur > FADE_IN_DURATION) {
                        return 255;
                } else {
                        display.repaintDelayed(40000); // 25 fps
                        return byte((dur * 255) / FADE_IN_DURATION);
                }
        } else {
                if (dur > FADE_OUT_DURATION) {
                        return 0;
                } else {
                        display.repaintDelayed(40000); // 25 fps
                        return byte(255 - ((dur * 255) / FADE_OUT_DURATION));
                }
        }
}

bool OSDConsoleRenderer::updateConsoleRect()
{
        adjustColRow();

        ivec2 size((font.getWidth()  * console.getColumns()) + CHAR_BORDER,
                    font.getHeight() * console.getRows());

        // TODO use setting listener in the future
        ivec2 pos;
        switch (consolePlacementSetting.getEnum()) {
                case CP_TOPLEFT:
                case CP_LEFT:
                case CP_BOTTOMLEFT:
                        pos[0] = 0;
                        break;
                case CP_TOPRIGHT:
                case CP_RIGHT:
                case CP_BOTTOMRIGHT:
                        pos[0] = (screenW - size[0]);
                        break;
                case CP_TOP:
                case CP_CENTER:
                case CP_BOTTOM:
                default:
                        pos[0] = (screenW - size[0]) / 2;
                        break;
        }
        switch (consolePlacementSetting.getEnum()) {
                case CP_TOPLEFT:
                case CP_TOP:
                case CP_TOPRIGHT:
                        pos[1] = 0;
                        break;
                case CP_LEFT:
                case CP_CENTER:
                case CP_RIGHT:
                        pos[1] = (screenH - size[1]) / 2;
                        break;
                case CP_BOTTOMLEFT:
                case CP_BOTTOM:
                case CP_BOTTOMRIGHT:
                default:
                        pos[1] = (screenH - size[1]);
                        break;
        }

        bool result = (pos != bgPos) || (size != bgSize);
        bgPos  = pos;
        bgSize = size;
        return result;
}

void OSDConsoleRenderer::loadFont(string_view value)
{
        string filename = systemFileContext().resolve(value);
        auto newFont = TTFFont(filename, fontSizeSetting.getInt());
        if (!newFont.isFixedWidth()) {
                throw MSXException(value, " is not a monospaced font");
        }
        font = std::move(newFont);
        clearCache();
}

void OSDConsoleRenderer::loadBackground(string_view value)
{
        if (value.empty()) {
                backgroundImage.reset();
                return;
        }
        auto* output = display.getOutputSurface();
        if (!output) {
                backgroundImage.reset();
                return;
        }
        string filename = systemFileContext().resolve(value);
        if (!openGL) {
                backgroundImage = std::make_unique<SDLImage>(*output, filename, bgSize);
        }
#if COMPONENT_GL
        else {
                backgroundImage = std::make_unique<GLImage>(*output, filename, bgSize);
        }
#endif
}

void OSDConsoleRenderer::drawText(OutputSurface& output, const ConsoleLine& line,
                                  ivec2 pos, byte alpha)
{
        for (auto i : xrange(line.numChunks())) {
                auto rgb = line.chunkColor(i);
                string_view text = line.chunkText(i);
                drawText2(output, text, pos[0], pos[1], alpha, rgb);
        }
}

void OSDConsoleRenderer::drawText2(OutputSurface& output, string_view text,
                                   int& x, int y, byte alpha, unsigned rgb)
{
        unsigned width;
        BaseImage* image;
        if (!getFromCache(text, rgb, image, width)) {
                string textStr = text.str();
                SDLSurfacePtr surf;
                unsigned rgb2 = openGL ? 0xffffff : rgb; // openGL -> always render white
                try {
                        unsigned dummyHeight;
                        font.getSize(textStr, width, dummyHeight);
                        surf = font.render(textStr,
                                           (rgb2 >> 16) & 0xff,
                                           (rgb2 >>  8) & 0xff,
                                           (rgb2 >>  0) & 0xff);
                } catch (MSXException& e) {
                        static bool alreadyPrinted = false;
                        if (!alreadyPrinted) {
                                alreadyPrinted = true;
                                reactor.getCliComm().printWarning(
                                        "Invalid console text (invalid UTF-8): ",
                                        e.getMessage());
                        }
                        return; // don't cache negative results
                }
                std::unique_ptr<BaseImage> image2;
                if (!surf) {
                        // nothing was rendered, so do nothing
                } else if (!openGL) {
                        image2 = std::make_unique<SDLImage>(output, std::move(surf));
                }
#if COMPONENT_GL
                else {
                        image2 = std::make_unique<GLImage>(output, std::move(surf));
                }
#endif
                image = image2.get();
                insertInCache(std::move(textStr), rgb, std::move(image2), width);
        }
        if (image) {
                if (openGL) {
                        byte r = (rgb >> 16) & 0xff;
                        byte g = (rgb >>  8) & 0xff;
                        byte b = (rgb >>  0) & 0xff;
                        image->draw(output, ivec2(x, y), r, g, b, alpha);
                } else {
                        image->draw(output, ivec2(x, y), alpha);
                }
        }
        x += width; // in case of trailing whitespace width != image->getWidth()
}

bool OSDConsoleRenderer::getFromCache(string_view text, unsigned rgb,
                                      BaseImage*& image, unsigned& width)
{
        // Items are LRU sorted, so the next requested items will often be
        // located right in front of the previously found item. (Though
        // duplicate items (e.g. the command prompt '> ') degrade this
        // heuristic).
        auto it = cacheHint;
        // For openGL ignore rgb
        if ((it->text == text) && (openGL || (it->rgb  == rgb))) {
                goto found;
        }

        // Search the whole cache for a match. If the cache is big enough then
        // all N items used for rendering the previous frame should be located
        // in the N first positions in the cache (in approx reverse order).
        for (it = begin(textCache); it != end(textCache); ++it) {
                if (it->text != text) continue;
                if (!openGL && (it->rgb  != rgb)) continue;
found:          image = it->image.get();
                width = it->width;
                cacheHint = it;
                if (it != begin(textCache)) {
                        --cacheHint; // likely candiate for next item
                        // move to front (to keep in LRU order)
                        textCache.splice(begin(textCache), textCache, it);
                }
                return true;
        }
        return false;
}

void OSDConsoleRenderer::insertInCache(
        string text, unsigned rgb, std::unique_ptr<BaseImage> image,
        unsigned width)
{
        static const unsigned MAX_TEXT_CACHE_SIZE = 250;
        if (textCache.size() == MAX_TEXT_CACHE_SIZE) {
                // flush the least recently used entry
                auto it = std::prev(std::end(textCache));
                if (it == cacheHint) {
                        cacheHint = begin(textCache);
                }
                textCache.pop_back();
        }
        textCache.emplace_front(std::move(text), rgb, std::move(image), width);
}

void OSDConsoleRenderer::clearCache()
{
        // cacheHint must always point to a valid item, so insert a dummy entry
        textCache.clear();
        textCache.emplace_back(string{}, 0, nullptr, 0);
        cacheHint = begin(textCache);
}

gl::ivec2 OSDConsoleRenderer::getTextPos(int cursorX, int cursorY)
{
        return bgPos + ivec2(CHAR_BORDER + cursorX * font.getWidth(),
                             bgSize[1] - (font.getHeight() * (cursorY + 1)) - 1);
}

void OSDConsoleRenderer::paint(OutputSurface& output)
{
        byte visibility = getVisibility();
        if (!visibility) return;

        if (updateConsoleRect()) {
                try {
                        loadBackground(backgroundSetting.getString());
                } catch (MSXException& e) {
                        reactor.getCliComm().printWarning(e.getMessage());
                }
        }

        // draw the background image if there is one
        if (!backgroundImage) {
                // no background image, try to create an empty one
                try {
                        if (!openGL) {
                                backgroundImage = std::make_unique<SDLImage>(
                                        output, bgSize, CONSOLE_ALPHA);
                        }
#if COMPONENT_GL
                        else {
                                backgroundImage = std::make_unique<GLImage>(
                                        output, bgSize, CONSOLE_ALPHA);
                        }
#endif
                } catch (MSXException&) {
                        // nothing
                }
        }
        if (backgroundImage) {
                backgroundImage->draw(output, bgPos, visibility);
        }

        for (auto loop : xrange(bgSize[1] / font.getHeight())) {
                drawText(output,
                         console.getLine(loop + console.getScrollBack()),
                         getTextPos(0, loop), visibility);
        }

        // Check if the blink period is over
        auto now = Timer::getTime();
        if (lastBlinkTime < now) {
                lastBlinkTime = now + BLINK_RATE;
                blink = !blink;
        }

        unsigned cursorX, cursorY;
        console.getCursorPosition(cursorX, cursorY);
        if ((cursorX != lastCursorX) || (cursorY != lastCursorY)) {
                blink = true; // force cursor
                lastBlinkTime = now + BLINK_RATE; // maximum time
                lastCursorX = cursorX;
                lastCursorY = cursorY;
        }
        if (blink && (console.getScrollBack() == 0)) {
                drawText(output, ConsoleLine("_"),
                         getTextPos(cursorX, cursorY), visibility);
        }
}

} // namespace openmsx